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Q.

Is it true that the electric heater and bulb are connected in parallel, and then an electric heater produces more heat as it has low resistance than an electric bulb?

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a

True

b

False

answer is A.

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Detailed Solution

The above statement is true.
The heat dissipation through a conductor can be expressed as

H = I^{2} Rt

. We know that heater and bulb connected in parallel and parallel voltage remain the same therefore expressed heat dissipation in terms of voltage and resistance. Now heat dissipation is

H = \frac{V^{2}}{R} t

. From this equation, we see that heat dissipation is inversely proportional to the resistance, which means if the resistance is low, heat dissipation is more. As we know, the heater dissipates more heat thus it has low resistance.

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