1.0 kg of water is container in a 1.25 kW kettle Calculate the time taken for the temperature of water to rise from 25 C to its boiling point 100C. Specific heat capacity of water = $ 4.2 J g^-1K^-1$
Mass of water = 1000 g. Change in temperature=100C 25 C = 75 C (or 75K) Amount of heat energy required to raise temperature = 1000 4.2 75 = 315000 J. Time taken to raise the temperature, T = 4 min 12 seconds.
