1. Current Electricity
Sections 12.1, 12.2, 12.3, 12.4

2. What is Current Electricity?
Involves the flow of electrons in a controlled way through a conductor.

3. Electric Circuits
A circuit is the path that the electron flow through.
Basic parts of a circuit:
Source – the source of electrons (battery, etc)
Conductor – provides a path for the electrons (wires)
Load – converts the electrical energy into other forms of energy (light bulb, motor, etc)
Switch – controls the flow of electrons
Open switch = no flow of electrons
Closed switch = flow of electrons

4. Electrical Energy Measured in Joules (J)
Electrical devices use electrical energy to do work (measured in Watts  W)
Light bulb: electrical energy  light energy
Motor: electrical energy  motion

5. Sources of Electrical Energy
Electric Cells: a device that coverts chemical energy into electrical energy (a.k.a. a battery)
Primary cell – can only be used once
Secondary cell – can be recharged
Fuel Cells: a special kind of electric cell through which a continuous supply of chemicals is pumped as the cell operates.

6. How a Hydrogen Fuel Cell Works

7. Forms of Current Electricity
Direct Current (DC) – the electrons flow in only one direction (a battery produces DC current)
Alternating Current (AC) – the electrons move back and forth (a generator produces AC current)
More efficient in distributing electrical energy

8. The History of DC & AC

9. Today’s Tasks
Pg. 508 #3
Pg. 510 #4, 6
Pg. 514 #3, 6
Pg. 517 #2, 4