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Question

For a heater rated at 4 kW; 220 V . Calculate the resistance of the heater element.
  1. 200Ω
  2. 20Ω
  3. 21.6Ω
  4. 12.2Ω

A
12.2Ω
B
20Ω
C
21.6Ω
D
200Ω
Solution
Verified by Toppr

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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