Electricity lesson

1. ELECTRICITY

2. Electricity is the energy caused by the flow of
electrons.

3. Charge and Static Electricity
Chapter 17
 Static Electricity : A BUILD UP
OF CHARGE (electrons) on an
object!

4. Static electricity by friction and
conduction
1. Friction: build up of charge by
rubbing one object against another.
Rubbing hair with balloon

5. 2. Conduction: build up of charge by direct
contact between 2 objects

6. Current electricity
• Current is a flow of electric charges. It is not a build up of
charge that is discharged.
• All current electricity needs a circuit (a close pathway for
electric charges to flow).
• All circuits must have at least 3 parts :
1) wires, 2) a source 3) a load(s).

7. Parts of a circuit
wires Source of electricity
Load

8. Conductors
• Conductor: a material that easily allows the
flow of electric charges.
• It gives very little resistance to the flow of
charge. ( metals – copper, aluminum , etc )

9. Insulators
• Insulators: They don’t easily allow the flow
of electric charges through them.
• Ex: glass, plastic, certain rubber materials,
cloth.
WIRE

10. Types of circuits
• http://www.brainpop.com/science/energy/el
ectriccircuits/
http://www.brainpop.com/science/energy/electri

11. Types of circuits
• 1. Series Circuit: only 1 path for the electric
charges to flow
• 2. Parallel Circuit: has More than one path
for the electric charges to flow.

12. Series circuit

14. 2. Parallel Circuit: has more than 1 path for
electric charges to flow, so if 1 load goes “out,”
the other loads will still work !

16. Draw a parallel circuit

17. SWITCHES
• A switch is a device that opens or closes a
circuit. When you switch on a lamp, you close
the circuit. When you switch off a lamp, you
open the circuit.