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

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Question 32

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.

A

0.31 A

B

3.20 A

C

3.40 A

D

5.00 A

Explanation

Share Answer Efficiency = (power output)/power input x 100%
= 1_s V_S x 100% 1_p
V_p
(80)/100 = (50)/I_P x 200
I P = (50 x 100)/80 x 200 = 3.125 A

Correct option: A

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