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Power in an AC Circuit

A bulb is con...

Question

A bulb is connected first with dc and then ac of same voltage then it will shine brightly with

A

AC

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B

DC

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C

Brightness will be in ratio

\frac{1}{1.4}

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D

Equally with both

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Solution

The correct option is D Equally with both
Brightness $\propto P_{c o n s u m e d} \propto \frac{1}{R} f o r B u l b, R_{a c} = R_{d c},$ so brightness will be equal in both the cases.

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