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Electric Charges
& Circuits




Some rights reserved by reutC
Remember:
Electric charges come in
two varieties.


           Negative
                &
           Positive
Opposite charges attract.
Like charges repel.
Like charges repel.
How do we describe
electricity?
Voltage
 The difference in electric
 potential between 2 points.
              or

  How much the electric charges
  want to move.
Some	
  rights	
  reserved	
  by	
  Elfo	
  Tógrafo	
  




High Voltage
Some	
  rights	
  reserved	
  by	
  Elfo	
  Tógrafo	
  




Low Voltage
Some	
  rights	
  reserved	
  by	
  Elfo	
  Tógrafo	
  




Zero Voltage
How do we describe
electricity?
Voltage
  is measured in Volts (V).




                      Some rights reserved by crows to burnaby
The symbol for   Voltage is:


          V
How do we describe
electricity?
 Current
 How much electricity is flowing
Some	
  rights	
  reserved	
  by	
  Elfo	
  Tógrafo	
  




High Current
Some	
  rights	
  reserved	
  by	
  Elfo	
  Tógrafo	
  




Low Current
The symbol for   Current is:


            I
Current
is measured in Ampères (Amps)
How do we describe
electricity?
Resistance
 How difficult it is for electricity
 to move through a material.
Low
                                                                        Resistance


                                                            High
                                                      Resistance
Electric fence, via Wikimedia Commons: http://commons.wikimedia.org/wiki/File:XN_Electrical_insulation_Electric_fence_00.jpg
The symbol for

Resistance is:


   R
Resistance
is measured in Ohms (Ω)
Ohm’s Law

V=IR               Watch:
http://www.youtube.com/watch?v=-mHLvtGjum4

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Current, Voltage, & Resistance