3. A 120-V hair dryer has two settings: 1250 W and 1875 W. (a) At which setting do you guess the resistance to be higher? After making a guess, determine the resistance at (b) the lower setting, and (c) the higher setting
Added by Troy V.
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We can rearrange this equation to solve for resistance: $R = \frac{V^2}{P}$. Show more…
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(II) A 120-V hair dryer has two settings: 950 W and 1450 W. ($a$) At which setting do you guess the resistance to be higher? After making a guess, determine the resistance at ($b$) the lower setting, and ($c$) the higher setting.
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(II) A $120-\mathrm{V}$ hair dryer has two settings: 850 $\mathrm{W}$ and 1250 $\mathrm{W}$ . (a) At which setting do you expect the resistance to be higher? After making a guess, determine the resistance at (b) the lower setting; and (c) the higher setting.
(a) What is the resistance of the heater element in a $1500 \mathrm{W}$ hair dryer that plugs into a $120 \mathrm{V}$ outlet? (b) What is the current through the hair dryer when it is turned on? (c) At a cost of $\$ 0.10$ per $\mathrm{kW} \cdot \mathrm{h},$ how much does it cost to run the hair dryer for 5.00 min? (d) If you were to take the hair dryer to Europe where the voltage is $240 \mathrm{V}$, how much power would your hair dryer be using in the brief time before it is ruined? (e) What current would be flowing through the hair dryer during this time?
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