An electric heater has a resistance of 50Ω. When it is immersed in water and...
PHYSICS
WAEC 2013
An electric heater has a resistance of 50Ω. When it is immersed in water and connected to mains source, it draws a current of 4.0A. Calculate the heat gained by the water if the heater is switched on for 2 minutes, assuming no heat losses to the surroundings
- A. 4200J
- B. 1600J
- C. 24000J
- D. 96000J
Correct Answer: D. 96000J
Explanation
Q = I2RT = 42 x 50 x 2 x 60 = 96000J
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