First slide

Electrical machines and devices

Question

A step-up transformer operates on a 230 V line and supplies a load of 2 ampere. The ratio of the primary and secondary windings is 1 : 25. The current in the primary is

Moderate

A

15 A
B

50 A
C

25 A
D

12.5 A

Solution

$\frac{N_{s}}{N_{p}} = \frac{i_{p}}{i_{s}} or \frac{25}{1} = \frac{i_{p}}{2} \Rightarrow i_{p} = 50 A$

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