Level-2. An electric kettle of 2000 W is used to boil 20 litres of water. Find the time required to boil the waterfron its initial temperature of 20°С. Take specific heat of water as 4200 J kg 'K-A circle is constructed
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(i) Power P=Et
Energy supplied by the electric kattle is used to increase the temperature of 20 litres of water from 20∘C to 100∘C. But heat energy Q=msΔθ.
Calculate the heat energy absorbed by the water.
Substituting the value of energy and power in equation (1) we can determine the time.
(ii) 56 minutes
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