Question

Question 20:
100 joules of heat is produced per second in a 4 ohm resistor. What is the potential difference across the resistor ?

Lakhmir Singh Physics Class 10

Answer 1

H=100 J

T=1 s

R=4 Ohm

H=I2RT

I2=H/RT

I2=100/4×1

I2=25

I=square root of 25

I=5 A

R=V/I

V=IR

V=5×4

V= 20 V