2.03 Electrical current (ii)

There is another equation which can be used to calculate the current flowing through a conductor. This can be used when we know the total amount of charge that has passed a point in the circuit over a known time period.

current flow

This equation clearly illustrates that current is the flow rate of electrical charge.

  I = Q/t

A charge of 100C passes a point in a circuit in 20 seconds
 I   =   Q/t   =    100/20 =   5 Amps