Current electricity

1. Potential difference

1.1. The energy possessed by 1 unit of charge at any one point in a circuit.

1.1.1. V=W/Q

2. E.M.F (electromotive force)

2.1. The work done used to drive one unit of charge round a complete circuit.

3. Voltage

4. Current

4.1. The time taken to drive one unit of charge round a complete circuit

4.1.1. I=Q/T

5. Resistance

5.1. Ohm's law

5.1.1. R=V/I (constant)

5.2. R is inversely proportional to area

5.3. R is directly proportional to length

5.4. P=RA/L