First slide

Electrical machines and devices

Question

In a transformer 220 ac voltage is increased to 2200 volts. If the number of turns in the secondary are 2000, then the number of turns in the primary will be

Moderate

A

200
B

100
C

50
D

20

Solution

$\frac{V_{p}}{V_{s}} = \frac{N_{p}}{N_{s}} \Rightarrow N_{p} = (\frac{220}{2200}) 2000 = 200$

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