Question
European Light Bulb. In Europe the standard voltage in homes is $230 \mathrm{~V}$. Therefore, a "100 W" European bulb would be intended for use with a $230 \mathrm{~V}$ potential difference (a) If you use a "100 W" European bulb in the United States, where the standard voltage is $120 \mathrm{~V}$, what should be its U.S. power rating?(b) How much current will the $100 \mathrm{~W}$ European bulb draw in normal use in the United States?
Step 1
We can use the formula for power, which is $P = \frac{V^2}{R}$, where $P$ is power, $V$ is voltage, and $R$ is resistance. We can rearrange this formula to solve for $R$: $R = \frac{V^2}{P}$. Show more…
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European Light Bulb. In Europe the standard voltage in homes is $220 \mathrm{~V}$ instead of the $120 \mathrm{~V}$ used in the United States. Therefore a "100 W" European bulb would be intended for use with a $220 \mathrm{~V}$ potential difference (see Problem 25.36 ). (a) If you bring a "100 W" European bulb home to the United States, what should be its U.S. power rating? (b) How much current will the $100 \mathrm{~W}$ European bulb draw in normal use in the United States?
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