Question

Calculate the energy transfered by a 5 ampere current flowing through a resistors of 2 ohms for 30 minutes

Answer 1

Given, I = 5 A
R = 2 $\Omega$
t = 30 min = 1800 s
Heat energy produced by electric current in the resistor is given by :
H = I² Rt
H = (5)² X 2 X 1800 = 90,000 J = 90 kJ