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  4. A step up transformer connected to a 220 VAC line is to supply 22 kV 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

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Q. A step up transformer connected to a $220\, VAC$ line is to supply $22\, kV$ 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

Electromagnetic Induction

Solution:

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