A transformer with efficiency 90% works at 4.5 kW and 100 V. If the secondary voltage is 200 V, then the primary and secondary currents are respectively.

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45 A, 20.25 A

45 A, 18.6 A

20.25 A, 45 A

18.6 A, 45 A

answer is A.

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Detailed Solution

Pinput =4500W,100lin=4500⇒Iin =45APout =90100×Pin Vout lout =90100×Vin lin Iout =20.25A

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