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An electric kettle is rated 5 kW. How much time will it take to boil 15 kg of water initially at 15°C, if it is connected to 230 V supply? If one unit of electric energy costs 1.21, find the cost incurred. [Ans. 17 min 51 s. 71.79] [Hint: Energy required to boil water = msAT, where specific heat capacity of water (s) is 4186 J/kg]

Posted by Neha Singh 3 years, 10 months ago

CBSE > Class 10 > Science

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