How much time in minutes does a 1 kW electric heater take to heat 10 litre water from
34◦C to 42◦C. Assume heating efficiency of 80%. Take 1 cal = 4.2 J Take specific heat capacity of water as 1 cal/gm◦C.
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C to 42◦C. Assume heating efficiency of 80%. Take 1 cal = 4.2 J Take specific heat capacity of
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