A power transmission line feeds input power at 2300 V to a step down transformer with its primary windings having 4000 turns. The number of turns in the secondary in order to get output power at 230 V are
(i) 4
(ii) 40
(iii) 400
(iv) 4000
(iii) 400
Explanation:
Given,
`"E"_{"i"}` = 2300V
`"E"_{0}` = 230V
`"N"_{"p"}` = 4000
`"N"_{"s"}` = ?
`\frac{"E"_{"i"}}{"E"_{0}}` = `\frac{"N"_{"p"}}{"N"_{"s"}}`
`\frac{2300}{230}` = `\frac{4000}{"x"}`
∴ x = 4000 = `"N"_{"s"}`
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