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Question

A step-down transformer has 50 turns on secondary and 1000 turns on the primary winding. If a transformer is connected to 220V and 1A AC source, what is the output current of the transformer?


A

120A

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B

20A

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C

100A

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D

2A

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Solution

The correct option is B

20A


Step 1: Given data

Number of the turns in the primary winding, Np=1000

Number of the turns in the secondary winding, Ns=50

Current in primary windings, Ip=1A

Supply Voltage =220V

Step 2: Finding the output current of the transformer.

We know that,

Current in the secondary windings,

Is=NpNsIp

Where Is is the current in the secondary winding.

Is=100050×1

Is=20A

Hence, option B is correct.


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