First slide

Electrical machines and devices

Question

The primary winding of transformer has 500 turns whereas its secondary has 5000 turns. The primary is connected to an ac supply of 20 V, 50 Hz. The secondary will have an output of

Moderate

A

200 V, 50 Hz
B

2 V, 50 Hz
C

200 V, 500 Hz
D

2 V, 5 Hz

Solution

$\frac{V_{s}}{V_{p}} = \frac{N_{s}}{N_{p}} \Rightarrow \frac{V_{s}}{20} = \frac{5000}{500} \Rightarrow V_{s} = 200 V$
Frequency remains unchanged.

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