Q.

A step-up transformer operates on a 200 V line and supplies to a load of 2 A. The ratio of primary to secondary windings is 1 : 25. The primary current is

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a

8.8 A

b

0.08 A

c

12.5 A

d

50 A

answer is D.

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Detailed Solution

Given that np / ns = 1/25, Ep=200V and IS=2AWe know thatESEp=nSnp or Es=200×25=5000VNow, Input power = output powerEs×Is=EpIp5000×2=200×Ip or Ip=50A
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A step-up transformer operates on a 200 V line and supplies to a load of 2 A. The ratio of primary to secondary windings is 1 : 25. The primary current is