You plan to take your hair dryer to Europe, where the electrical outlets put out 240 V instead of the 120 V seen in the United States. The dryer puts out 1600 W at 120 V. (a) What could you do to operate your dryer via the 240-V line in Europe? (b) What current will your dryer draw from a
European outlet? (c) What resistance will your dryer appear to have when operated at 240-V?

Answer

(a) $\frac{1}{2}$
(b) $6.67 \mathrm{A}$
(c) $36.0 \Omega$

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Physics 102 Electricity and Magnetism

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Chapter 31

Alternating Current

Section 6

Transformers

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Video Transcript

welcome to the golden number thirty one point three four. So in this question, given that when you are off to Europe so the output electrical world from the sockets is not one twenty whether it's two forty. So we have the power which is from the diary output which is close to sixteen hundred ward at one. Twenty one. So we need to find out how can we operated dryer? Why are the two forty world flying in euro? So definitely we have a device and this device is a called as a transformer. So this transformer changes from we want to be toward it having and one turns to the end to tents. And we have Ivan current passing through the wire with rewarded and that changes toe toe corresponding with courage and we are given here. The work is here and our coverage and power everyday is conserved over both condition and we have the institution and the situations of power is conserved because the energy per second is conserved and we have a transformer that Khun worlds the world. We want to be two of me to be one, and this formula is the condition that is even by the Jim NT of the transformer. So we have destitution here. So we have that assistance If we talk about the resistance So we have a B average because to be anonymous square for our So all the Israelis are Aramis World. It is values So looking at this one. So we have V one Ivan called to try to whatever the average Wass before before transforming or changing the the world changes. We have this situation so looking at this from the hair So this gives us are effective which is the new assistance because our or what? And to for anyone square So we have even this world every two this morning so we have and to or end one equals to one over two. So this is over a pot. So we will lose step down transformer Because we're getting the two hundred forty one. But we want one twenty one. It's we want to convert This world is to the one twenty because our instrument can handle only one. It is so we have to use this step Don't transform so we can't this much Now this was our part. Now we go to the party B now. So we have this situation now. This therefore, this Ivan gives us a B average over Leven, Which is it? Also, sixteen hundred Ward four were to forty. So the current is six point six seven MPs. Now we have this one current. So now we had a resistant. So we have resistance equals two. Me too square over the average, which is equals to one twenty World square. Over sixteen hundred work. This is a question I know. So now they fifteen assistance off. The blower has changed. So much is because two are effective, which is are over and two over and one square. So this gives those thirty six home. So that's the question from the stands off precaution. Thank you for watching the video.

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