Part F A transformer supplies 60 watts of power to a device that is rated at 20

Question

Part F

A transformer supplies 60 watts of power to a device that is rated at 20 volts. The primary coil is connected to a 120-volt ac source. What is the current I1 in the primary coil?

Express your answer in amperes.

Part G

The voltage and the current in the primary coil of a nonideal transformer are 120 volts and 2.0 amperes. The voltage and the current in the secondary coil are 19.4 volts and 11.8 amperes. What is the efficiency e of the transformer? The efficiency of a transformer is defined as the ratio of the output power to the input power, expressed as a percentage: e=100Pout/Pin.

Express your answer as a percentage.

Explanation / Answer

part G: P1 = V1i1

i1 = 60/120 = 0.5 Amps

apply P1 =P2

secondary power p2 = v2i2

P2 = 19.4*11.8

P2 = 228.92 Watts

effeciecy =100*(19.4*11.8)/(120*2)

e=95.4 %

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