The voltage in the electric lamp is 10 V, and the current is 5 A. Determine the work of the electric current in 4 s.

Given:

U = 10 Volts – voltage in an electric lamp;

I = 5 Amperes – the strength of the current passing through the electric lamp;

t = 4 seconds – time span.

It is required to determine A (Joule) – the work of an electric current for a time interval t.

Let’s find the power of the electric current:

W = U * I = 10 * 5 = 50 watts.

Then the work of the current will be equal to:

A = W * t = 50 * 4 = 200 Joules.

Answer: In four seconds, the work of the electric current will be equal to 200 Joules.