Question

A water heater of power $2000W$ is used to heat water. The specific heat capacity of water is $4200J$ $k{g}^{-1}{K}^{-1}$. The efficiency of heater is $70\%$. Time required to heat $2kg$ of water from $10^{\circ }C$ to $60^{\circ }C$ is___$s$.
(Assume that the specific heat capacity of water remains constant over the temperature range of the water).

Answer 1

Answer: 300