First slide

Electrical machines and devices

Question

A step up transformer connected to a 220 V AC line is to supply 22 kV for a neon sign in secondary circuit. In primary circuit a fuse wire is connected which is to blow when the current in the secondary circuit exceeds 10 mA. The turn ratio of the transformer is

Moderate

A

50
B

100
C

150
D

200

Solution

$\frac{N_{s}}{N_{p}} = \frac{V_{s}}{V_{p}} = \frac{22000}{220} = 100$

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