An electric heater has a resistance of 50 Omega... - WAEC Physics 2013 Question
An electric heater has a resistance of 50\(\Omega\). 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
400J
B
1600J
C
24000J
D
96000J
correct option: d
Q = I2RT
= 42 x 50 x 2 x 60
= 96000J
= 42 x 50 x 2 x 60
= 96000J
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