First slide

Transformer

Question

A 220 volt input is supplied to a transformer. The output circuit draws a current of 2.0 ampere at 440 volt. If the efficiency of the transformer is 80%, the current drawn by the primary winding of the transformer is :

Easy

A

5.0 ampere
B

3.6 ampere
C

2.8 ampere
D

2.5 ampere

Solution

$η = \frac{V_{s} I_{s}}{V_{p} I_{p}} = 0.8 \Rightarrow I_{p} = \frac{(440) (2)}{(0.8) (220)} = 5 A$

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