An electric heater has a resistance of 50Ω. When it is immersed in water and connected to the 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

by | Jan 26 | Physics WAEC | 0 comments

A. 400J
B. 1600J
C. 24000J
D. 96000J

Correct Answer: Option D

D. 96000J

Explanation

Q = I²RT

= 4² x 50 x 2 x 60

= 96000J

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