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A step-down transformer has a power output of 50 W and efficiency of 80%. if the...


Question

A step-down transformer has a power output of 50 W and efficiency of 80%. if the mains supply voltage is 200 v, calculate the primary current of the transformer.

Options

A) 0.31 A

B) 3.20 A

C) 3.40 A

D) 5.00 A


The correct answer is A.

Explanation:

Efficiency = (power output)/power input x 100%
= 1s VS x 100% 1p
Vp
∴ (80)/100 = (50)/IP x 200
I P = (50 x 100)/80 x 200 = 3.125 A

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