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Question

A step down transformer reduces 220V to 11V.The primary coil draws 5A current and secondary coil supplies 90A.Efficiency of the transformer will be

A
4.4%
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B
20%
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C
33%
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D
90%
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Solution

The correct option is D 90%
Answer is D.

The efficiency of a transformer can be calculated using Equation,
Efficiency=OutputpowerofthetransformerInputpowerofthetransformer=PsPp×100
In this case, the output power is calculated as follows.
The output voltage is 11 V and current is 90 A
Power=VI=11×90=990W.
The input power is calculated as follows.
The input voltage is 220 V and current is 5 A
Power=VI=220×5=1100W.
So, η=9901100×100=90.
The efficiency of the transformer is 90%.

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