Question

If a heater of 100 $\Omega$ resistance draws a current of 5 A for an hour then find the energy consumed by the heater.

• A. 3600 KJ
• B. 9000 KJ
• C. 2500 KJ
• D. 1800 KJ

Answer 1

The correct option is B

9000 KJ

We have, I = 5, R = 100, t = 1 $\times$ 60 $\times$ 60 = 3600 seconds
We know, H = $I^2$RT
H = $5^2$​ $\times$ 100 $\times$ 3600 = 9 $\times$ ${10}^6$J
H = 9000 KJ