If 2.0 x 10^-4 c charge passes a point in 5.0 x 10^-5 s, what is the rate of current flow?
4.0 x 10^-1 a
1.0 x 10^2 a
1.0 x 10^-10 a
4.0 x 10^0 a

Current is defined as the rate of charge flowing a point every second. Having a current of 1 Ampere signifies 1 Coulomb is flowing in a circuit every second. It is measured by the use of an ammeter which is positioned in series to the component to be measured. The current in the problem is calculated as follows:

I = 2.0 x 10^-4 C / 5.0 x 10^-5 s
I = 4 A or 4.0 x 10^0 A