Question

A resistance of $20\Omega$ is connected to a 40 V battery. Calculate the heat energy in joules generated per minute.

Answer 1

Given:
V= 40 V
R = $20\Omega$

We know from Ohm's law
I = V / R

= 40 / 20 = 2 Ampere

Heat energy = $I^{2}Rt$

= $(2{)}^2\times 20\times 60$

= 4800 Joules