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An electric kettle is fitted with a heater unit of 120Ω resistance. The efficiency is 84 per cent and the voltage is 220V. How long will it take to heat 0.75 litre of water from 6°C to 100°C? Take the specific heat capacity of water as 4.2kJ/kg°C.

Home/ College/An electric kettle is fitted with a heater unit of 120Ω resistance. The efficiency is 84 per cent and the voltage is 220V. How long will it take to heat 0.75 litre of water from 6°C to 100°C? Take the specific heat capacity of water as 4.2kJ/kg°C.