a heater coil connected to 220 v has a resistance of 150 ohm. how long will it take this coil to heat 1 kg water from 20degree to 60 degree c ,assumming that all heat is taken up by water ?
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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.
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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