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NCERT Class XII Chapter
Alternating Current
Questions With Solutions

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Question : 23
Total: 26
A power transmission line feeds input power at 2300 V to a step down transformer with its primary windings having 4000 turns. What should be the number of turns in the secondary in order to get output power at 230 V?
Solution:  
Here Ep = 2300 V, Np = 4000 turns, Es = 230 V, Ns = ?
We know in a transformer,
Es
Ep
 =
Ns
Np
Ns =
EsNp
Ep
 =
230×4000
2300
 = 400 turns
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