GCSE Physics: Current and Charge

Electric charge is measure in coulombs, C. A current of one Amp is equal to the rate of flow of charge of on coulomb per second. For a stead current in a circuit:

Q = I * t

If 25 coulombs of charge pass through in 100 seconds, the curren is given by:

Current = 25 / 100 = 0.25A

The charge carried by 1 electron is (1.6 * 10^-19) C.

The size of the current flowing in a particular part of a circuit is done using an ammeter. It measures the charge flowing per second in that particular part of the circuit. Current is measured in Amps.

Useful examples: