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2015-05-12T01:00:17+05:30

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Potential difference across the heater coil = 220 V
Resistance = 150 Ohm.

power dissipated = V² / R = 220² / 150 Watts = 968/3 Watts

Energy required to heat 1 kg water from 20 deg to 60 deg C
           = m s (T2 - T1)
           = 1 kg * 4.18 kJ/ kg/°C  * (60° - 20°)
           = 16.72 kJ

Time duration needed =  16.72 kJ / (968/3) Watts  = 51.8 seconds.

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