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Thermal and Chemical Effect of Current — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsThermal and Chemical Effect of Current2 Marks
Question
An electric bulb marked 220V, 100W will get fused if it is made to consume 150W or more. What voltage fluctuation will the bulb withstand?
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Answer

$\text{V}=220\text{v}$$\text{P}=100\text{w}$
$\text{R}=\frac{\text{V}^2}{\text{P}}$
$=\frac{220\times220}{100}=484\Omega$
$\text{P}=150\text{w}$
$\text{V}=\sqrt{\text{PR}}=\sqrt{150\times22\times22}$
$=22\sqrt{150}=269.4\approx270\text{v}$

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