For a heater rated at 4kW; 220V . Calculate the resistance of the heater element.
200Ω
20Ω
21.6Ω
12.2Ω
A
12.2Ω
B
20Ω
C
21.6Ω
D
200Ω
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Solution
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Given: V=220 volts P=4000 W
Electric power is given by
P=V2R where R is resistance and V is voltage.
∴ Resistance of the heater R=V2P=22024000=12.1Ω
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