An electric heater with a p.d of 240 V connected across its terminals has a total resistance of 960Ω. find the power rating of the heater.

A. 0.25 W
B. 4.00 W
C. 38.40W
D. 60.00W

Correct Answer:

Option D = 60.00W

Explanation

Electrical power = IV or I²R or (V)/R
With V = 240v, R = 960Ω
Power (V²)/R = (240 X 240)/960
=60Watts