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Question

A step-up transformer works on 220V and gives 2 A to an external resistor. The ratio of the number of turns between the primary and secondary coils is 2:25. Assuming 100% efficiency, find the secondary voltage, primary current and power delivered.

A
2750 V, 25 A, 5500 W
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B
2750 V, 20 A, 5000 W
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C
2570 V, 25 A, 550 W
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D
2750 V, 20 A, 55 W
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Solution

The correct option is B 2750 V, 25 A, 5500 W

We have EP=220 V And IS=2A

Given NS:NP=25:2

From formula ESEP=NSNP=IPIS

ES220=252=IP2

Hence ES=2750V

IP=25A

Power = ESIS

=2750× 2

=5500W


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