1. Chapter 22
Current Electricity

2. 22.1 Current and Circuits Producing Electric Current
The flow of charged particles is an electric current.
The flow of positive charge is conventional current.
One source of potential difference is the voltaic or galvanic cell. These convert chemical energy into electrical energy. Several of these cells connected together are called a battery.

3. A second source of electric energy is the photovoltaic cell, or solar cell.
A generator can also be used to convert kinetic energy into electrical energy.

4. Electric Circuits
A circuit includes a charge pump that increases the potential energy of the charges moving in the circuit.
The charges move around a closed loop.
Charges cannot be created or destroyed so the total number of charges must remain the same.
The change in electric energy, E, equals qV.

5. Rates of Charge Flow and Energy Transfer
Power measures the rate of energy transfer.
A flow rate of one coulomb per second is called an ampere, A, and is represented by 1C/s = 1A.
Power is represented by P = IV, where I is the current and V is the potential difference.

6. Resistance and Ohm’s Law
Diagramming Circuits

7. 22.2 Using Electric Energy Energy Transfer in Electric Circuits
Heating a resistor
Transmission of Electric Energy
The Kilowatt-Hour