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Power Factor

In an electri...

Question

In an electric iron heat produced is same, whether it is connected across an A.C. source or across 50 constant voltage. R.M.S, value of the A.C. voltage applied is

50 V

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Zero

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50 \sqrt{2} V

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\frac{50}{\sqrt{2}} V

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Solution

The correct option is B $50 V$
$\frac{V^{2}}{R} t$ (in AC) = $\frac{V_{(r m s)}^{2} t}{R}$ (in DC)

$V_{D C} = (V_{r m s}) - A C$

${(V_{r m s})}_{A C}$ $= 50 V$

Hence Option $A$ is correct answer.

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