First slide

Electrical machines and devices

Question

In a transformer, number of turns in the primary are 140 and that in the secondary are 280. If current in primary is 4A then that in the secondary is

Moderate

A

4 A
B

2 A
C

6 A
D

10 A

Solution

$\frac{V_{p}}{V_{s}} = \frac{i_{s}}{i_{p}} \Rightarrow i_{s} = 4 \times \frac{140}{280} = 2 A$

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