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Unformatted text preview: rmer on a pole outside your house. The drawing shown below is a schematic representation. The primary side is connected through the power lines to a distribution substation; the rms value of V1 is 7260 VAC. The secondary side is connected to your house; the rms value of V2 is 220 VAC. You use this 220 VAC to run your clothes dryer, whose heater coil has a resistance of 9Ω. When you run your dryer, how much current flows on the primary side? A. < 1 Amp B. 2 Amps C. 12 Amps D. 23 Amps Secondary:
220Voltsrms
I2 =
= 24.4 Ampsrms 9!
V
220V
V1 I1 = V2 I 2 ! I1 = I 2 2 = (24.4 A)
= 0.74 A V1
7260V
Note: you are essentially given the turns ratio because you are given the ratio of V1 to V2. You need not know anything about the actual values of N1 or N2. 13. A flying wire problem: You hold a metallic meter stick in a horizontal orientation and...
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 Spring '14

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