First slide

Electrical machines and devices

Question

The number of turns in primary and secondary coils of a transformer are 100 and 20 respectively. If an alternating potential of 200 volt is applied to the primary, the induced potential in secondary will be

Moderate

A

10 V
B

40 V
C

1000 V
D

20,000 V

Solution

$\frac{E_{p}}{E_{s}} = \frac{N_{p}}{N_{s}} \Rightarrow \frac{200}{E_{s}} = \frac{100}{20} \Rightarrow E_{s} = 40 V$

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