Question on: JAMB Physics - 2006
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
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Correct Option: D
Electrical power = IV or I2R or (V)/R
With V = 240v, R = 960Ω
Power (V2)/R = (240 X 240)/960
=60Watts
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