What work is done by a current in a circuit with a resistance of 4 ohms at a current of 5 A in a time equal to 5 minutes?

R = 4 ohms.

I = 5 A.

t = 5 min = 300 s.

A -?

The work of an electric current A when it passes through a conductor is determined by the Joule-Lenz law: A = I * U * t, where I is the current in the conductor, U is the voltage at the ends of the conductor, t is the time the current passes through the conductor.

We express the value of the current in the conductor I according to Ohm’s law: I = U / R.

U = I * R.

The work of current A will be determined by the formula: A = I ^ 2 * R * t.

A = (5 A) ^ 2 * 4 Ohm * 300 s = 30,000 J = 30 * 10 ^ 3 J = 30 kJ ..

Answer: when the current passes through the conductor, it performs work A = 30 kJ.