First slide

Transformer

Question

A step-down transformer is connected to 2400 volt line and 80 ampere of current is found to flow in output load. The ratio of the turns in primary and secondary coil is 20 : 1. If transformer efficiency is 100%, then the current flowing in the primary coil will be

Easy

A

1600 amp
B

20 amp
C

4 amp
D

1.5 amp

Solution

$\frac{I_{s}}{I_{p}} = \frac{n_{p}}{n_{s}} \frac{80}{I_{p}} = \frac{20}{1} or I_{p} = 4 amp$

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