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Power Factor

A 220 volt ...

Question

A $220 v o l t$ input is supplied to a transformer. The output circuit of $2.0 a m p e r e$ at $440 v o l t s$ . If the efficiency of the transformer is $80 %$ , the current drawn by the primary windings of the transformer is

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Solution

Efficiency, $η = \frac{o u t p u t p o w e r}{i n p u t p o w e r}$

$η = \frac{V_{s} I_{s}}{V_{p} I_{p}}$

$I_{p} = \frac{440 \times 2}{\frac{80}{100} \times 220}$

$I_{p} = 5 A$

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