First slide

Transformer

Question

A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 ampere, the efficiency of the transformer is approximately :

Easy

A

10%
B

30%
C

50%
D

90%

Solution

$η = \frac{V_{s} I_{s}}{V_{p} I_{p}} x 100 = \frac{100}{220 x 0.5} x 100 = 90 %$

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