First slide

Electrical machines and devices

Question

The output voltage of a transformer connected to 220 volt line is 1100 volt at 2 amp current. Its efficiency is 100%. The current coming from the line is

Moderate

A

20 A
B

10 A
C

11 A
D

22 A

Solution

For 100% efficiency $V_{s} i_{s} = V_{p} i_{p}$
$\Rightarrow 1100 \times 2 = 220 \times i_{p} \Rightarrow i_{p} = 10 A$

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