You plan to take your hair blower to Europe, where the electrical outlets put ou

Question

You plan to take your hair blower to Europe, where the electrical outlets put out 240 V instead of the 120 V seen in the United States. The blower puts out 1700 W at 120 V .

1-What could you do to operate your blower via the 240

V line in Europe?

a)Use a step_up transformer with

N2/N1 = 2.

b)Use a step_down transformer with

N2/N1 = 1/2.

2-What current will be drawn from the 240

V line when the dryer is connected to the 120 V side of the transformer?

Express your answer using two significant figures.

3-What resistance connected directly to the 240

V line would draw the same power as the dryer in part B?

Express your answer using two significant figures.

Explanation / Answer

Apply in a transforner

Ns/Np = Vs/Vp = Is/Ip

where NS ans Np are seconda dr and primary tunrs

Vs and Vp are secondary and primary volatges

Is and Ip are secondary and prianry currents

also in ideal tansformer output P = input P

so VsIs = VpIp

1. to use it Europe we need V2 = 240 V

V1 = 120 V

so

Ns/Np = Vs/Vp 240/120 = 2

answer : Use a step_up transformer with , N2/N1 = 2

------------------------------------

part B :

as P = vi

i1 = 1700/120 = 14.16 Amps

i2 = i1 * Np/ns

i2 = 14.16* 1/2

i2 = 7.08 Amps

-------------------------------------------------

Power P = V^2/R

R = 240*240/1700

R = 33.88 ohms

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