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# Power Consumption of Electric Heater (KVPY ’10)

An electric heater coonsists of a nichrome coil and under $$220V$$
consuming $$1KW$$ power. Part of its coil burned out and it was reconnected after cutting off the burnt portion. The power it will consume now is:
(A) more than $$1KW$$
(B) less than$$1KW$$, but not zero
(C) $$1KW$$
(D) 0kW

Discussion:

Part of coil is burnt. Then it was cut off. Hence resistance decreases. Hence there will be more current flow.
ELectric power $$P=I^2R$$
Hence, power consumption will increase.

October 22, 2017