1. Principles of Electricity: Electric Charge and Force

2. Electric Charge Just as in magnetism, in electricity:
Protons- (+) positive electric charge
Electrons (-) negative electric charge
Just as in magnetism, in electricity:
Charges that are the same repel each other
Charges that are opposite attract

3. Magnetism vs. Electricity
Interaction between magnetic poles
A single magnetic pole CANNOT exist alone
Electricity:
Interaction between electric charges
Electric charges CAN exist alone

4. Electric Force
the attraction or repulsion between electric charges

5. Features of a circuit Have devices that run by electrical energy
Source of electrical energy
Connected by conducting wires

6. Open/Closed Circuits Open = Incomplete circuit 1. No energy can run
Closed = Complete circuit
1. Energy can follow a path

7. Types of Circuits
Series circuit  only one path for electricity to follow
Parallel circuit  more than one path for electricity to follow

8. The symbols for the various components are as follows:
Light bulbs
Switch
Wires
Voltage Source R1 + - V V

9. Put it all together
Now that you know what the parts are, let’s draw a series circuit and a parallel circuit.

10. What is current?
Continuous flow of electric charges through a material (wire)
Two factors that affect current: conductors and insulators

11. Ohm’s Law
Ohm’s Law states that there is a relationship between current, voltage, and resistance
V = IR
Voltage = Current x Resistance

12. Conductors Materials that transfer electric charge well
What kinds of materials do you think would make good conductors?

13. Conductors
Metals

14. Insulators Materials that transfer electric charges poorly
What kinds of materials do you think would make good insulators?

15. Insulators
Nonmetals