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RMS Value

A light bulb ...

Question

A light bulb is rated at $100 W$ for a $220 V$ supply. Find the peak voltage of the source:

A

111 V

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B

211 V

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C

311 V

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D

411 V

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Solution

The correct option is C $311 V$
$A n s w e r : -$ C
The rated voltage in bulb is rms voltage.
$V_{r m s} = \frac{V_{0}}{\sqrt{2}} V_{0} = \sqrt{2} \times 220 = 311.08 V$

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