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Q.

An electric heater consists of a nichrome coil and runs 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

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a

0 KW 

b

1 KW

c

Less than 1 KW, but not zero

d

More than 1 KW 

answer is A.

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Detailed Solution

Given that V = 220V
Nichrome coil of resistance = R
P = 1000 W
When burned coil is removed and reconnected, as length of coil decreases. So resistance decreases, then power increases, more power will be consumed. i.e., more than 1 KW  .
 

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