Question

A transformer is used on a 2000 V input line to deliver 20 A at 120 V at the secondary coil. if the power efficiency of the transformer is 80%, then current drawn from the input line is​

Answer 1

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Answer 2

V1 = 2000 V

I1 = ?

V2 = 120 V

I2 = 20 A

As we can see efficiency is 80%

So output = 0.80 × input

V2 I2 = 0.80 V1 I1

120 × 20 = 0.80 × 2000 I1

So I1 = 2400/1600 = 1.5 Amps.

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