Q.

A 220 volt input is supplied to a transformer. The output circuit draws a current of 2.0 ampere at 440 volt. If the efficiency of the transformer is 80%, the current drawn by the primary winding of the transformer is :

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a

5.0 ampere

b

3.6 ampere

c

2.8 ampere

d

2.5 ampere

answer is A.

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Detailed Solution

η=VsIsVpIp=0.8⇒Ip=44020.8220=5 A
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A 220 volt input is supplied to a transformer. The output circuit draws a current of 2.0 ampere at 440 volt. If the efficiency of the transformer is 80%, the current drawn by the primary winding of the transformer is :