First slide

Electrical machines and devices

Question

A 100% efficient transformer has 100 turns in the primary and 25 turns in its secondary coil. If the current in the secondary coil is 4 amp, then the current in the primary coil is

Moderate

A

1 amp
B

4 amp
C

8 amp
D

16 amp

Solution

For 100% efficient transformer
$V_{s} i_{s} = V_{p} i_{p} \Rightarrow \frac{V_{s}}{V_{p}} = \frac{i_{p}}{i_{s}} = \frac{N_{s}}{N_{p}} \Rightarrow \frac{i_{p}}{4} = \frac{25}{100} \Rightarrow i_{p} = 1 A$

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