Electricity and Magnetism Lesson PowerPoint, Physical Science Unit

1. • We have a 100 watt light bulb using .83 amps of power per second. – How many volts does it require? – Volts = watts divided by amps. – Volts = 100 / .83 – Volts = 120

4. -Nice neat notes that are legible and use indentations when appropriate. -Example of indent. -Skip a line between topics -Don’t skip pages -Make visuals clear and well drawn. Please label. Ice Melting Water Boiling Vapor GasT E M P Heat Added 

5. • RED SLIDE: These are notes that are very important and should be recorded in your science journal. • BLACK SLIDE: Pay attention, follow directions, complete projects as described and answer required questions neatly. Copyright © 2010 Ryan P. Murphy

8. • Much different than it is for most of us.

9. • Much different than it is for most of us.

10. • Video Link! Nikola Tesla… Hank explains great minds. – Preview for language. – http://www.youtube.com/watch?v=pPnGvjmIgZA

11. • Does somebody want to try and define the word electricity?

15. • These are the questions and definitions we need to know to generate a definition for electricity? – What is electric charge? – What is electrical energy? – What are electrons – What is electric current? – What is an imbalance of charge? – What is an electric field? – What is voltage? – What is electric power? – What is a spark? – What is electromagnetism? – What is electrical science? – What is electrodynamics? – What is electrostatics? – What are electrical phenomena? Copyright © 2010 Ryan P. Murphy

16. • These are the questions and definitions we need to know to generate a definition for electricity? – What is electric charge? – What is electrical energy? – What are electrons – What is electric current? – What is an imbalance of charge? – What is an electric field? – What is voltage? – What is electric power? – What is a spark? – What is electromagnetism? – What is electrical science? – What is electrodynamics? – What is electrostatics? – What are electrical phenomena? Copyright © 2010 Ryan P. Murphy

27. • Annoying Tape. – Teacher gives each student 2 long pieces (10 centimeters each) strips of clear tape. • Make non-stick handles by folding a small amount tape on itself. Copyright © 2010 Ryan P. Murphy

28. • Annoying Tape. – Teacher gives each student 2 long pieces (10 centimeters each) strips of clear tape. • Make non-stick handles by folding a small amount tape on itself. – Stick one piece of tape to table. – Stick the other piece of tape on that tape. – Quickly pull tape from table and then apart. – Observe what happens to the tape when it gets close to each other and then eventually your arm. • Try and dispose of in trash barrel by shaking the tape from your hand and not picking. Copyright © 2010 Ryan P. Murphy

29. • Annoying Tape. – Teacher gives each student 2 long pieces (10 centimeters each) strips of clear tape. • Make non-stick handles by folding a small amount tape on itself. – Stick one piece of tape to table. – Stick the other piece of tape on that tape. – Quickly pull tape from table and then apart. – Observe what happens to the tape when it gets close to each other and then eventually your arm. • Try and dispose of in trash barrel by shaking the tape from your hand and not picking. Copyright © 2010 Ryan P. Murphy

30. • What happened!

31. • What happened! – When you removed the tape from the table you gave it an electrical charge. When you peeled the tape apart from each other, one piece of tape gained more of a charge than the other.

32. • What happened! – When you removed the tape from the table you gave it an electrical charge. When you peeled the tape apart from each other, one piece of tape gained more of a charge than the other. • Opposite charges attract (+) (-)

33. • Annoying Tape. – Teacher gives each student 2 long pieces (10 centimeters each) strips of clear tape. • Make non-stick handles by folding a small amount tape on itself. – Stick both pieces of tape to table. – Quickly pull tape from table. – Observe what happens to the tape when it gets close to each other and then eventually your arm. • Try and dispose of in trash barrel by shaking the tape from your hand and not picking. Copyright © 2010 Ryan P. Murphy

34. • Annoying Tape. – Teacher gives each student 2 long pieces (10 centimeters each) strips of clear tape. • Make non-stick handles by folding a small amount tape on itself. – Stick both pieces of tape to table. – Quickly pull tape from table. – Observe what happens to the tape when it gets close to each other and then eventually your arm. • Try and dispose of in trash barrel by shaking the tape from your hand and not picking. Copyright © 2010 Ryan P. Murphy

35. • What happened?

36. • What happened? – Each piece of tape gained a negative charge when removed from the table. When they were brought close together they moved away from each other.

37. • What happened? – Each piece of tape gained a negative charge when removed from the table. When they were brought close together they moved away from each other. • Like charges repel. (-) (-)

38. • Life occurs because of electrostatic charges.

39. • Life occurs because of electrostatic charges. • Without them, life would simple unravel.

40. • Life occurs because of electrostatic charges. • Without them, life would simple unravel. Electricity. Learn more at… http://science.howstuffworks.com/electri city.htm

41. • Electricity Available Sheet

49. • Visit a magnetic field simulator. http://phet.colorado.edu/en/simulation/mag nets-and-electromagnets

63. • Activity Simulation. Magnetic Field Hockey • http://phet.colorado.edu/en/simulation/electr ic-hockey

71. Reminder to teacher to reset the arrows!

72. • Magnet: An object that is surrounded by a magnetic field and that has the property, either natural or induced, of attracting iron or steel.

75. • Activity! Fun with Magnets for 2:39 seconds then we are moving on. – The class can earn additional “play time” with good behavior.

76. • Activity! Fun with Magnets for 2:39 seconds then we are moving on. – The class can earn additional “play time” with good behavior.

77. • Ferrofluids Video Link! (Optional) – http://www.youtube.com/watch?v=kL8R8SfuXp 8&feature=related

78. • Activity. The Fonz – Try and pick up paper hole punches with a plastic comb. – Next run the comb through your hair and over your clothes to collect a charge. – Try again. What happened?

80. • Activity Simulation. John Travoltage. • http://phet.colorado.edu/en/simulation/trav oltage Static Charge

82. • Answer! – Electrons from your body move into the balloon. – This gives you a positive charge. – Your hair is also positive. – Like charges repel so hair tries to get away from body. Copyright © 2010 Ryan P. Murphy

83. • Answer! – Electrons from your body move into the balloon. – This gives you a positive charge. – Your hair is also positive. – Like charges repel so hair tries to get away from body. Copyright © 2010 Ryan P. Murphy + + +? ?

84. • Answer! – Electrons from your body move into the balloon. – This gives you a positive charge. – Your hair is also positive. – Like charges repel so hair tries to get away from body. Copyright © 2010 Ryan P. Murphy + + ? ?

85. • Answer! – Electrons from your body move into the balloon. – This gives you a positive charge. – Your hair is also positive. – Like charges repel so hair tries to get away from body. Copyright © 2010 Ryan P. Murphy + + +

97. • Activity! Static Balloons – Blow up a balloon and tie it off. – Write name on it with soft pen. – Rub balloon against hair and quickly stick to wall (everyone together). Copyright © 2010 Ryan P. Murphy

98. • Activity! Static Balloons – Blow up a balloon and tie it off. – Write name on it with soft pen. – Rub balloon against hair and quickly stick to wall (everyone together). – Observe what happens, Whose balloon will last the longest? Copyright © 2010 Ryan P. Murphy

99. • Answer to wall sticking balloon.

100. • Answer to wall sticking balloon. – Electrons from hair are removed and put into balloon.

101. • Answer to wall sticking balloon. – Electrons from hair are removed and put into balloon. – Balloon has slight negative charge.

102. • Answer to wall sticking balloon. – Electrons from hair are removed and put into balloon. – Balloon has slight negative charge. – The atoms orient and wall has slight positive charge.

103. • Answer to wall sticking balloon. – Electrons from hair are removed and put into balloon. – Balloon has slight negative charge. – The atoms orient and wall has slight positive charge. – Opposite charges attract and balloon sticks.

104. • Activity Simulator. Balloons Explained • http://phet.colorado.edu/en/simulation/ballo ons

106. • We usually only notice static electricity in the winter when the air is very dry.

107. • We usually only notice static electricity in the winter when the air is very dry. During the summer, the air is more humid.

108. • We usually only notice static electricity in the winter when the air is very dry. During the summer, the air is more humid. – The water in the air helps electrons move off you more quickly, so you can’t build up a large static charge.

109. • Demonstration Static Electricity • Set-up below and move balloon around cup.

110. • What happened? Balloon gained electrons from rubbing (

111. • What happened? Balloon gained electrons from rubbing (now more negative). The match is neutral and is attracted to the negative balloon. – Balancing on coin reduces friction.

112. • What happened? Balloon gained electrons from rubbing (now more negative). The match is neutral and is attracted to the negative balloon.

113. • What happened? Balloon gained electrons from rubbing (now more negative). The match is neutral and is attracted to the negative balloon. – Balancing on coin reduces friction.

115. • Activities Van de Graaff generator • Please read safety and operation precautions on this link. – http://hypertextbook.com/eworld/vdg.shtml

119. • Video! How a Van de Graaff Generator works. – http://www.youtube.com/watch?v=I2G0IdTWG QU

124. • Demonstration 2: Packing peanuts. – Put some packing peanuts in a plastic cup and tape it to the top of the generator. – Turn on the generator and away they go! Copyright © 2010 Ryan P. Murphy If you have a “demo” wasp nest, the wasp paper in pieces works very well.

126. • Demonstration 3 – Bad Hair day. – One student to stand on plastic trash barrel. – Put both hands on generator. – Turn it on and hair should stand up on end.

140. • Other Demonstrations: – Blow bubbles near the generator. – Place aluminum pie plate on generator in stack. – Light a candle near generator to observe electrical winds. – Tape many long strips of tissue paper to generator. – Tie an aluminum can so it hangs just above the generator. Copyright © 2010 Ryan P. Murphy

141. • Video! If you don’t have a Van de Graaff Generator. – http://www.youtube.com/watch?v=hh8PqQDOAb8

142. • Coulombs Law: Any two charged objects will create a force on each other. Opposite charges will produce an attractive force while similar charges will produce a repulsive force.

147. • Coulombs Law: Any two charged objects will create a force on each other. Opposite charges will produce an attractive force while similar charges will produce a repulsive force. – Coulombs Law: The greater the charges, the greater the force. The greater the distance between them, the smaller the force.

148. • Coulombs Law: Any two charged objects will create a force on each other. Opposite charges will produce an attractive force while similar charges will produce a repulsive force. – Coulombs Law: The greater the charges, the greater the force. The greater the distance between them, the smaller the force.

149.  Coulombs Law:  The greater the charges, the greater the force.

150.  Coulombs Law:  The greater the charges, the greater the force.

151.  Coulombs Law:  The greater the charges, the greater the force.  The greater the distance between them, the smaller the force.

152. • Video Link! Coulombs Law – Be proactive, sketch some notes. If it gets a bit advanced stay positive. (No worries here). – http://www.youtube.com/watch?v=rYjo774UpHI

153. • Video Link! Coulombs Law – Be proactive, sketch some notes. If it gets a bit advanced stay positive. (No worries friend). – http://www.youtube.com/watch?v=rYjo774UpHI

155. • If your car gets struck by lightning in a thunderstorm, will you be safe. Why?

158. • If your car gets struck by lightning in a thunderstorm, will you be safe. Why? Yes

159. • Answer: You will be safe because your cars metal chassis acts like a Faraday Cage.

160. • Answer: You will be safe because your cars metal chassis acts like a Faraday Cage. The charged particles travel around the outside of the car and into the ground.

166. • A Faraday cage is a metallic enclosure that prevents the entry or escape of an electromagnetic field.

167. • A Faraday cage is a metallic enclosure that prevents the entry or escape of an electromagnetic field. – For best performance, the cage should be directly connected to an earth ground.

168. • A Faraday cage is a metallic enclosure that prevents the entry or escape of an electromagnetic field. – For best performance, the cage should be directly connected to an earth ground. That person would be dead without that Faraday cage.

169. • Video Link. Human Faraday Cage. • http://www.youtube.com/watch?v=Fyko81 WAvvQ

170. • Optional Activity! Teacher to make a Faraday Cage wallet. – Does a student have a cell phone that we can place in the wallet and call? • Why won’t it ring?...Hopefully. • http://howto.wired.com/wiki/Make_a_Faraday_Cag e_Wallet

184. • Activity (Optional) Conductors using a conductivity meter. – Find one conductor and one insulator by roving around the classroom for one minute or looking on your person. – Test with conductivity meter. Copyright © 2010 Ryan P. Murphy

186. • Activity Simulator Link: Semi-Conductors • http://phet.colorado.edu/en/simulation/sem iconductor

187. • How does a battery work? – Electrochemical reaction – The chemical reactions in the battery causes a build up of electrons at the anode. This results in an electrical difference between the anode and the cathode. • Electrons repel each other and try to go to a place with fewer electrons. • The electrolyte keeps the electrons from going straight from the anode to the cathode within the battery

191. • How does a battery work? – Electrochemical reaction

192. • How does a battery work? – Electrochemical reaction – The chemical reactions in the battery causes a build up of electrons at the anode.

193. • How does a battery work? – Electrochemical reaction – The chemical reactions in the battery causes a build up of electrons at the anode. This results in an electrical difference between the anode and the cathode.

194. • How does a battery work? – Electrochemical reaction – The chemical reactions in the battery causes a build up of electrons at the anode. This results in an electrical difference between the anode and the cathode. • Electrons repel each other and try to go to a place with fewer electrons.

196. • Activity! (Optional) Lemon Battery – Note: Not as easy it looks and this battery won’t produce a lot of energy.

212. • Also works with film canisters, vinegar (acetic acid), nails, and copper wire.

224. • Rockin Quiz! – This is your chance to rock it out in science class so don’t just sit there. At least rock your head or tap your desk etc. – After some intro slides, teacher will call on a student to rock it out on their way to the board. – Student goes to board and touches the picture that represents AC or DC on the AC/DC logo (If using a screen just point and drum the air). – Student will then pick a new student to go to the board as the teacher changes the slide. – Thunderstruck video (For the music during quiz and I didn’t see anything inappropriate ). – http://www.youtube.com/watch?v=v2AC41dglnM

225. • Note: Many devices such as computers plug into the wall (AC Current) but the AC current is converted into DC Current to run through the machine.

226. • Note: Many devices such as computers plug into the wall (AC Current) but the AC current is converted into DC Current to run through the machine. – For simplicity sake in this activity, if it has a plug we will call it AC, and if doesn’t (batteries) we will call it DC.

227. Thunderstruck - Play Now! http://www.youtube.com/watch?v=v2AC41dglnM

232. “DC”

233. “Its one way!”

237. “AC”

238. “It Alternates!”

240. • Is this (AC) Alternating Current, or (DC) Direct Current?

263. • Is this (AC) Alternating Current, or (DC) Direct Current? ?

277. • Where do you find this strange device? – What does it do?

278. • An electric meter or energy meter is a device that measures the amount of electrical energy consumed by a residence, business, or an electrically powered device.

279. • Video Link! Reading your meter at home. • Optional: – http://www.youtube.com/watch?v=k2ogwitaAh4 Using a Multimeter - http://www.doctronics.co.uk/meter.htm

281.  Volt: A measure of the force or pressure under which electricity flows.

289. • Question? We have a small computer server with a sticker that shows 2.5 amps. Given a normal 120 Volt, 60 hz power source and the ampere reading from equipment… – How many watts does it require?

290. • Raise your hand if you have no clue because you weren’t paying attention for that black slide that discussed what a Watt was?

291. • Raise your hand if you have no clue because you weren’t paying attention for that black slide that discussed what a Watt was?

294. • Volts are a measure of the force or pressure under which electricity flows.

295. • Volts are a measure of the force or pressure under which electricity flows.

296. • Volts are a measure of the force or pressure under which electricity flows. • Amps are a measurement of the current flow rate of electrons • .

297. • Volts are a measure of the force or pressure under which electricity flows. • Amps are a measurement of the current flow rate of electrons • . • Watts is a measurement of electrical power created.

298. • Volts are a measure of the force or pressure under which electricity flows. • Amps are a measurement of the current flow rate of electrons • . • Watts is a measurement of electrical power created. – 1 watt is equal to one joule of energy per second.

301. Crazy things about to happen.

302. Which is the correct description of Watts?

303. Which is the correct description of Watts? This is a measurement of electrical power created. This is a measure of the force or pressure under which electricity flows This is a measurement of the current flow rate of electrons

304. Which is the correct description of Watts? This is a measurement of electrical power created. This is a measure of the force or pressure under which electricity flows This is a measurement of the current flow rate of electrons

305. Which is the correct description of Amps? This is a measurement of electrical power created. This is a measure of the force or pressure under which electricity flows This is a measurement of the current flow rate of electrons

306. Which is the correct description of Amps? This is a measurement of electrical power created. This is a measure of the force or pressure under which electricity flows This is a measurement of the current flow rate of electrons

307. Which is the correct description of Volts? This is a measurement of electrical power created. This is a measure of the force or pressure under which electricity flows This is a measurement of the current flow rate of electrons

308. Which is the correct description of Volts? This is a measurement of electrical power created. This is a measure of the force or pressure under which electricity flows This is a measurement of the current flow rate of electrons

312. Which is the correct description of Amps? This is a measurement of electrical power created. This is a measurement of the current flow rate of electrons This is a measure of the force or pressure under which electricity flows

313. Which is the correct description of Amps? This is a measurement of electrical power created. This is a measurement of the current flow rate of electrons This is a measure of the force or pressure under which electricity flows

314. Which is the correct description of Volts? This is a measurement of electrical power created. This is a measurement of the current flow rate of electrons This is a measure of the force or pressure under which electricity flows

315. Which is the correct description of Volts? This is a measurement of electrical power created. This is a measurement of the current flow rate of electrons This is a measure of the force or pressure under which electricity flows

316. Which is the correct description of Watts? This is a measurement of electrical power created. This is a measurement of the current flow rate of electrons This is a measure of the force or pressure under which electricity flows

317. Which is the correct description of Watts? This is a measurement of electrical power created. This is a measurement of the current flow rate of electrons This is a measure of the force or pressure under which electricity flows

321. atts

322. atts

323. atts olts

324. atts olts

325. atts olts mps

326. atts olts mps

327. atts olts mps

328. atts olts mps How do you find Watts?

331. atts olts mps How do you find Amps?

334. atts olts mps How do you find Volts?

337. • Please complete these questions on the available sheet.

343. • Question? We have a small computer server with a sticker that shows 2.5 amps. Given a normal 120 Volt, 60 hz power source and the ampere reading from equipment – How many watts does it require? – Watts = Volts x Amps – Watts = 120v x 2.5amps = 300 Watts

345. • Question? We have a small computer server with a sticker that shows 2.5 amps. Given a normal 120 Volt, 60 hz power source and the ampere reading from equipment – How many watts does it require? – Watts = Volts x Amps – Watts = 120v x 2.5amps =

347. “Ahh, we have to do it again.” “We did it like ten times already.”

349. • Question? We have an electronic device with a sticker that shows 5 amps. Given a 12 Volt battery power source, How many watts does it require?: – Watts = Volts x Amps – Watts = 12 volts x 5 amps = 60watts

352. • Question? We have an electronic device with a sticker that shows 5 amps. Given a 12 Volt battery power source, How many watts does it require?: – Watts = Volts x Amps

353. • Question? We have an electronic device with a sticker that shows 5 amps. Given a 12 Volt battery power source, How many watts does it require?: – Watts = Volts x Amps – Watts = 12 volts x 5 amps =

355. • We have a 60 watt light bulb using 5 amps of power. – How many volts does it require?

359. • We have a 60 watt light bulb using 5 amps of power. – How many volts does it require? – Volts = watts divided by amps.

360. • We have a 60 watt light bulb using 5 amps of power. – How many volts does it require? – Volts = watts divided by amps.

361. • We have a 60 watt light bulb using 5 amps of power. – How many volts does it require? – Volts = watts divided by amps. – Volts = 60 / 5

362. • We have a 60 watt light bulb using 5 amps of power. – How many volts does it require? – Volts = watts divided by amps. – Volts = 60 / 5 – Volts =12

364. • We have a 100 watt light bulb using .83 amps of power per second. – How many volts does it require?

365. • We have a 100 watt light bulb using .83 amps of power per second. – How many volts does it require?

366. • We have a 100 watt light bulb using .83 amps of power per second. – How many volts does it require? – Volts = watts divided by amps.

367. • We have a 100 watt light bulb using .83 amps of power per second. – How many volts does it require? – Volts = watts divided by amps. – Volts = 100 / .83

368. • We have a 100 watt light bulb using .83 amps of power per second. – How many volts does it require? – Volts = watts divided by amps. – Volts = 100 / .83 – Volts = 120

374. • A sample electrical panel uses 60 watts at 12 volts. – How many amps does it require?

377. • A sample electrical panel uses 60 watts at 12 volts. – How many amps does it require? – amps = watts / volts

378. • A sample electrical panel uses 60 watts at 12 volts. – How many amps does it require? – amps = watts / volts – amps = 60 / 12

379. • A sample electrical panel uses 60 watts at 12 volts. – How many amps does it require? – amps = watts / volts – amps = 60 / 12 – amps = 5

380. • A sample electrical panel uses 60 watts at 12 volts. – How many amps does it require? – amps = watts / volts – amps = 60 / 12 – amps = 5

383. Get music for last question at… (Napoleon Dynamite Dance Song) http://www.youtube.com/watch?v=Nzor09DbYfY

385. Question? A computer uses 1.75 amps. Given a 50 volt power source, How many watts does it require?:

386. Question? A computer uses 1.75 amps. Given a 50 volt power source, How many watts does it require?: watts = volts x amps

387. Question? A computer uses 1.75 amps. Given a 50 volt power source, How many watts does it require?: watts = volts x amps

388. Question? A computer uses 1.75 amps. Given a 50 volt power source, How many watts does it require?: watts = volts x amps watts = 50 volts x 1.75 amps =

389. Question? A computer uses 1.75 amps. Given a 50 volt power source, How many watts does it require?: watts = volts x amps watts = 50 volts x 1.75 amps = 87.5 watts

390. Question? A computer uses 1.75 amps. Given a 50 volt power source, How many watts does it require?: watts = volts x amps watts = 50 volts x 1.75 amps = 87.5 watts Learn more about amps, watts, volts and ohms http://science.howstuffworks.com/environmental/energy/qu estion501.htm

391. • What’s a resistance?

393.  Resistance: Anything in an electrical circuit that impedes the flow of current is referred to as resistance. Copyright © 2010 Ryan P. Murphy The refusal to accept or comply with something; the attempt to prevent something by action or argument.

394. • Volts are a measure of the force or pressure under which electricity flows. • Amps are a measurement of the current flow rate of electrons • Resistance: Anything in an electrical circuit that impedes the flow of current is referred to as resistance. • Watts is a measurement of electrical power created. – 1 watt is equal to one joule of energy per second.

396. Which is the correct description of Watts? This is a measurement of electrical power created. This is a measurement of the current flow rate of electrons This is a measure of the force or pressure under which electricity flows Anything in an electrical circuit that impedes the flow of current.

405. Which is the correct description of Watts? This is a measurement of electrical power created. This is a measurement of the current flow rate of electrons Anything in an electrical circuit that impedes the flow of current. This is a measure of the force or pressure under which electricity flows

409. Which is the correct description of Watts? This is a measurement of the current flow rate of electrons Anything in an electrical circuit that impedes the flow of current. This is a measure of the force or pressure under which electricity flows This is a measurement of electrical power created.

413. Which is the correct description of Watts? This is a measurement of the current flow rate of electrons Anything in an electrical circuit that impedes the flow of current. This is a measure of the force or pressure under which electricity flows This is a measureme nt of electrical power created.

418. • Georg Simon Ohm (1789 –1854) – Ohm found that there is a direct proportionality between voltage applied across a conductor and the resultant electric current.

419. • Georg Simon Ohm (1789 –1854) – Ohm found that there is a direct proportionality between voltage applied across a conductor and the resultant electric current. Learn more at.. http://www.allaboutcircuits.co m/vol_1/chpt_2/1.html

420.  Ohms: The measure of resistance in a circuit to the flow of an electric current.  The greater the ohm value the more difficult it is for current to flow through a given circuit.  A low ohm value represents a low resistance and the easy flow of current through a circuit Current

421.  Ohms: The measure of resistance in a circuit to the flow of an electric current.  The greater the ohm value the more difficult it is for current to flow through a given circuit.  A low ohm value represents a low resistance and the easy flow of current through a circuit Current I is used instead of C because C is already used for Coulombs.

422.  Ohms: The measure of resistance in a circuit to the flow of an electric current.  The greater the ohm value the more difficult it is for current to flow through a given circuit.  A low ohm value represents a low resistance and the easy flow of current through a circuit Current I is used instead of C because C is already used for Coulombs. I is amps and today, you may see A instead of I

423.  Ohms: The measure of resistance in a circuit to the flow of an electric current.  The greater the ohm value the more difficult it is for current to flow through a given circuit.  A low ohm value represents a low resistance and the easy flow of current through a circuit Current

424. • Ohms: The measure of resistance in a circuit to the flow of an electric current. – The greater the ohm value the more difficult it is for current to flow through a given circuit. – A low ohm value represents a low resistance and the easy flow of current through a circuit

425. • Ohms: The measure of resistance in a circuit to the flow of an electric current. – The greater the ohm value the more difficult it is for current to flow through a given circuit. – A low ohm value represents a low resistance and the easy flow of current through a circuit.

426. • Ohms: The measure of resistance in a circuit to the flow of an electric current. – The greater the ohm value the more difficult it is for current to flow through a given circuit. – A low ohm value represents a low resistance and the easy flow of current through a circuit.

427. • Ohms: The measure of resistance in a circuit to the flow of an electric current. – The greater the ohm value the more difficult it is for current to flow through a given circuit. – A low ohm value represents a low resistance and the easy flow of current through a circuit. Current and resistance are inversely proportional. As one goes up, the other goes down. Voltage = (I) Electricity times Resistance

428. • Ohms: The measure of resistance in a circuit to the flow of an electric current. – The greater the ohm value the more difficult it is for current to flow through a given circuit. – A low ohm value represents a low resistance and the easy flow of current through a circuit. Current and resistance are inversely proportional. As one goes up, the other goes down. Resistance = Voltage divided by Current (I)

429. • Video Link! Ohms Law (Optional) – Be proactive, record notes as he does. – http://www.youtube.com/watch?v=-mHLvtGjum4

431. • If 220 volts travel through a copper wire and the current is 36A, – What’s the resistance of the wire?

435. • If 220 volts travel through a copper wire and the current is 36A, – What’s the resistance of the wire? V 220 R= ------ I

436. • If 220 volts travel through a copper wire and the current is 36A, – What’s the resistance of the wire? V 220 R= ------ --------- = 6.1 ohms I 36A

439. • Electricity flows through a wire much like water flows through a pipe.

440. • Electricity flows through a wire much like water flows through a pipe. – A force is required to drive it and resistance to is encountered, the flow of current is measured in amps

441. • Ohms Law Simulator at… – http://phet.colorado.edu/en/simulation/ohms-law

443. • A nine volt battery supplies power to a cordless drill with a resistance of 18 ohms. – How much current (I) is flowing through the drill?

447. • A nine volt battery supplies power to a cordless drill with a resistance of 18 ohms. – How much current (I) is flowing through the drill? – Electric Current = Volts / Resistance

448. • A nine volt battery supplies power to a cordless drill with a resistance of 18 ohms. – How much current (I) is flowing through the drill? – Electric Current = Volts / Resistance – Electric Current = 9 / 18

449. • A nine volt battery supplies power to a cordless drill with a resistance of 18 ohms. – How much current (I) is flowing through the drill? – Electric Current = Volts / Resistance – Electric Current = 9 / 18 – Electric Current = .5 amps

450. V = I x R

451. V = I x R V = I x R R R V = I x R R R I = V R I = 9 18 I = .5 amps

453. • A Rude Monkey decided to stick his tongue to a 120 V outlet with 50,000 ohms of resistance? – How much current will he experience? V 120 V I = ----- ----------- = .0024A R 50,000 ohms

454. • A Rude Monkey decided to stick his tongue to a 120 V outlet with 50,000 ohms of resistance? – How much current will he experience?

455. • A Rude Monkey decided to stick his tongue to a 120 V outlet with 50,000 ohms of resistance? – How much current will he experience?

456. • A Rude Monkey decided to stick his tongue to a 120 V outlet with 50,000 ohms of resistance? – How much current will he experience? V 120 V I = ----- ----------- = .0024A R

461. • A 110 volt outlet supplies power to a strobe light with a resistance of 2600 ohms. – How much current is flowing through the strobe light? V 110 V I = ----- ----------- = .0423A R 2,600 ohms

468. • Video Link! Current, Voltage, Resistance – http://www.youtube.com/watch?v=J4Vq- xHqUo8

469. • Visit a more complex circuit simulator AC and DC • http://phet.colorado.edu/en/simulation/circ uit-construction-kit-ac

470. • Visit an online circuit builder if materials are not present. – http://phet.colorado.edu/en/simulation/circuit- construction-kit-dc

478. • Activity – Creating a Circuit – Please create a circuit to light the light bulb with a switch. – Draw the circuit in your journal using the correct symbols. – Teacher to test voltage (record next to picture) – Label the following • Conductor • Insulator • Resistance • DC current • Coulomb’s Law Copyright © 2010 Ryan P. Murphy

481. • Activity: Connecting all of the lights to create one large circuit. –Can we connect all of the lights along a chain? –What will happen if one light bulb goes out? –Can we wire it so if one bulb goes the whole string will stay lit.

482. • This will be you at some point in your life so pay attention.

483. • This will be you at some point in your life so pay attention.

489. • Video! How to jumpstart a car. (Saab Ad?) – You will be driving soon, and may have to do this on your own. Is this an ad? – http://www.youtube.com/watch?v=li1PL6EpFF8

496. • Activity Challenge. • Visit this website and fill in the blanks correctly to demonstrate understanding. – http://education.jlab.org/reading/electrostatics.html

501. • Demonstration – Iron filings over a magnetic field – Sprinkle iron filings on a piece of paper. – Create the two poles a magnetic field with a magnetic from underneath the paper. – Identify the magnetic fields with a visual in your journal. Copyright © 2010 Ryan P. Murphy

507. • Demonstration – Iron filings over a magnetic field. Answer to visual! – Sprinkle iron filings on a piece of paper. – Create the two poles a magnetic field with a magnetic from underneath the paper. – Identify the magnetic fields with a visual in your journal. Copyright © 2010 Ryan P. Murphy

520. • Earth Available Sheet, Formation, Seasons, EM Field, Phases of the Moon.

521. • Activity! Drawing the earth’s EM Field.

522. • Activity! Drawing the earth’s EM Field. EM Field refers to Electromagnetic

523. • Activity! Drawing the earth’s EM Field. EM Field refers to Electromagnetic

524. • Activity! Drawing the earth’s EM Field. – Pass out a paper plate to everyone. – Draw a Earth about the size of a golf ball in the center. – Spread iron filings all around the plate.

525. • Activity! Drawing the earth’s EM Field. – Spread iron filings all around the plate. – From below, place a magnet beneath the earth and record the magnetic field that is created.

526. • Activity! Drawing the earth’s EM Field. – Spread iron filings all around the plate. – From below, place a magnet beneath the earth and record the magnetic field that is created. – Sketch the magnetic field / directions of the iron filings.

529. • Activity! Drawing the earth’s EM Field. – Spread iron filings all around the plate. – From below, place a magnet beneath the earth and record the magnetic field that is created. – Sketch the magnetic field / directions of the iron filings. Copy your sketch into you science journal and label as the EM Field

530. • Electromagnetic field protects the earth from charged particles. – It also creates the Aurora borealis (Northern Lights)

534. Earths EM field. Learn more: http://image.gsfc.nasa.gov/poetry/ magnetism/magnetism.html

535. • Video Link. Aurora borealis – http://www.youtube.com/watch?v=FcfWsj9OnsI – It needs music http://www.youtube.com/watch?v=OPFr1nVwwsA

536. • Most of the atmosphere that use to be on Mars, as well as the abundance of liquid water is now gone because of the planets weakened EM field.

537. • Most of the atmosphere that use to be on Mars, as well as the abundance of liquid water is now gone because of the planets weakened EM field. – Solar winds blew them away.

552. • Going outside to use the compass. – Find 0 degrees / North (hold and face) – Mark ground at feet with object. – Turn dial to 120 degrees, (Put Red Fred in the shed.) – Face and sight a target, take 30 steps keeping red Fred in shed. • Follow the red arrow when Red Fred is in the shed. – Turn dial to 240 degrees (Put Red Fred in the shed) – Face and sight a target, take 30 steps keeping red Fred in shed. – Turn dial to 360 degrees / North (Red Fred It) – Face and sight a target, take 30 steps keeping red Fred in shed. – How close were you? Copyright © 2010 Ryan P. Murphy

559. • Activity – Magnets • Please use the magnets and demonstrate the following (Show me as I walk around) – Opposite poles attract – Same poles repel – Electromagnetic field Copyright © 2010 Ryan P. Murphy

566. • Activity Simulator. Faraday’s Law and introduction to electromagnets. • http://phet.colorado.edu/en/simulation/faraday

567. • An electric motor uses the attraction and repelling properties of magnets to create motion.

568. • Electric motors use a permanent magnet and temporary magnet.

569. • Electric motors use a permanent magnet and temporary magnet.

570. • Electric motors use a permanent magnet and temporary magnet. – The permanent magnetic has a north and south Pole.

571. • Electric motors use a permanent magnet and temporary magnet. – The permanent magnetic has a north and south Pole. – The temporary magnet is a special magnet called an electromagnet. It is created by passing an electric current through a wire.

572. • The motor works by passing an electric current through a wire.

573. • The motor works by passing an electric current through a wire. – The permanent magnet has a magnetic field (north pole and south pole) all of the time.

574. • The motor works by passing an electric current through a wire. – The permanent magnet has a magnetic field (north pole and south pole) all of the time.

575. • The motor works by passing an electric current through a wire. – The permanent magnet has a magnetic field (north pole and south pole) all of the time. – The electromagnet only has a magnetic field when current is flowing through the wire.

576. • The motor works by passing an electric current through a wire. – The permanent magnet has a magnetic field (north pole and south pole) all of the time. – The electromagnet only has a magnetic field when current is flowing through the wire.

577. • The strength of the electromagnet's magnetic field can be increased by increasing the current through the wire, or by forming the wire into multiple loops.

578. • When the battery is not connected, the temporary magnet (loop / electromagnet) sits in the magnetic field of the permanent magnet.

579. • When the battery is not connected, the temporary magnet (loop / electromagnet) sits in the magnetic field of the permanent magnet. – When you connect the battery the temporary magnetic field interacts with the permanent magnetic field.

580. • When the battery is not connected, the temporary magnet (loop / electromagnet) sits in the magnetic field of the permanent magnet. – When you connect the battery the temporary magnetic field interacts with the permanent magnetic field. – Attracting and repelling forces created.

581. • When the battery is not connected, the temporary magnet (loop / electromagnet) sits in the magnetic field of the permanent magnet. – When you connect the battery the temporary magnetic field interacts with the permanent magnetic field. – Attracting and repelling forces created. – These forces push the temporary magnet (loop) which can spin freely.

582. • Video Link and Directions. • How to make a simple electric motor • http://www.youtube.com/watch?v=ziWUmI UcR2k

583. • Activity! Building a small electric engine. • A.) Coil the wire around the D battery many times. Remove the coil and wrap the ends around two sides of the coil to hold it in place. Leave 4 inches of wire on each end.

Electricity and Magnetism Lesson PowerPoint, Physical Science Unit

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Electricity and Magnetism Lesson PowerPoint, Physical Science Unit