Question

400 J of heat is produced in 4s in a 4 Ohm resistor. Find potential difference across the resistor.

Answer 1

We know,

Heat produced, H = i²Rt

=> H = (V/R)²Rt

=> H = V²t/R

=> V² = HR/t

=> V = (400×4/4)^1/2

=> V = 20 V

This is the required voltage.