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 1600 W at 120 V .

A) What could you do to operate your blower via the 240 V line in Europe? Use a step_up transformer with N2/N1 = 2, or Use a step_down transformer with N2/N1 = 1/2.

B) 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.

C) 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

(a)

In a transformer Ns/Np = Vs/Vp = Is/Ip

NS and Np are number of turns in coil

and Vs and Vp are secondary and primary voltage.

Primary voltage = 240 V

secondary voltage needed = 120 V

Ns/Np =120/240

Ns/Np = N2/N1 = 1/2 (By using step-down transformer)

(b)

Power = voltage times current = V*I

Current (I) = P/V

Current at 240V will be = 1600/240 = 6.66 A

(c)

Resistance R= V2/P

R = (2402)/1600

R = 36 ohm

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