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
4200J
1600J
24000J
96000J
Correct answer is D
Q = I2RT
= 42 x 50 x 2 x 60
= 96000J