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 25.40$)$ . (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 -W European bulb draw in normal use in the United States?
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Step 1: Calculate the resistance of the European bulb using the formula \(R = \frac{V^2}{P}\), where \(V = 220 \, \text{V}\) and \(P = 100 \, \text{W}\). 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?
A 60-W, 120-V light bulb and a 200-W, 120-V light bulb are connected in series across a 240-V line. Assume that the resistance of each bulb does not vary with current. ($Note:$ This description of a light bulb gives the power it dissipates when connected to the stated potential difference; that is, a 25-W, 120-V light bulb dissipates 25 W when connected to a 120-V line.) (a) Find the current through the bulbs. (b) Find the power dissipated in each bulb. (c) One bulb burns out very quickly. Which one? Why?
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