First slide

Electrical power

Question

A heater coil is cut in two equal parts and only one part is now used in the heater. The heat generated will now be

Easy

A

four times
B

one fourth
C

halved
D

doubled

Solution

The heat generated H is given by
$H = \frac{V^{2} t}{R} or H \propto \frac{1}{R}$
when .R is halved, the heat produced H will be doubled

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