Question

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

Answer 1

Hi friend,


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.

Hope this helps you..☺☺☺

Answer 2

Given,
Heat=400 J
Time=4s
Resistance=4Ω

To find=Potential Difference

We know that,
H=I²Rt

H=(V/R)²Rt

H=V²t/R

V² = HR/t

V = (400×4/4$)^{1/2}$

V = 20 V