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A power transmission line feeds input power at 2300 V to a step down trnasformer with it primary windings having 4000 turns. What should be the number of turns in the seconday windings in order to get output power at 230 V?

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Given, primary input voltage , `E_(p) ` = 2300 V
Number of turns in primary , `n_(p) ` = 4000
Secondary output voltage , `E_(s)` = 230 V
Let `n_(s)` be the number of turns in secondary widings.
`(E_(s))/(E_(p)) = (n_(s))/(n_(p))`
` (230)/(2300) = (n_(s))/(4000) `
`n_(s) = (230 xx 4000 )/(2300) = 400`
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