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NCERT Class XII Chapter
Alternating Current
Questions With Solutions

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Question : 23 of 26
Marks: +1, -0
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 EpE_p = 2300 V, NpN_p = 4000 turns, EsE_s = 230 V, NsN_s = ?
We know in a transformer, EsEp\frac{E_s}{E_p} = NsNp\frac{N_s}{N_p}
NsN_s = EsNpEp\frac{E_s N_p}{E_p} = 230×40002300\frac{230 \times 4000}{2300} = 400 turns
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