Electricity is the flow of electrons. Static electricity occurs when there is a buildup of electrons on an object without a discharge path, such as through friction. Current electricity requires a closed circuit or conductive path for electrons to flow from a power source through a load. Circuits can be in series, with one conductive path, or parallel with multiple paths. Conductors allow electron flow while insulators do not. Switches open or close circuits to control electron flow.

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.