First slide

Electrical machines and devices

Question

A transformer is employed to reduce 220 V to 11 V. The primary draws a current of 5 A and the secondary 90 A. The efficiency of the transformer is

Moderate

A

20%
B

40%
C

70%
D

90%

Solution

$η = \frac{V_{s} i_{s}}{V_{p} i_{p}} \times 100 = \frac{11 \times 90}{220 \times 5} \times 100 = 90 %$

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