An electric heater with a p.d of 240 V connected across its terminals has a…

Physics JAMB 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.

  • 0.25 W
  • 4.00 W
  • 38.40W
  • 60.00W checkmark

The correct answer is: D

Explanation

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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