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  4. A step down transformer converts transmission line voltage from 11000 V to 220 V. The primary of the transformer has 6000 turns and efficiency of the transformer is 60 %. If the output power is 9 kW, the number of turns in the secondary is

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Q. A step down transformer converts transmission line voltage from $11000\,V$ to $220\,V$. The primary of the transformer has $6000$ turns and efficiency of the transformer is $60\, \%$. If the output power is $9\,kW$, the number of turns in the secondary is

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Solution:

As, $\frac{V_{s}}{V_{p}}=\frac{N_{s}}{N_{p}} \Rightarrow N_{s}=\frac{V_{s}}{V_{p}}\times N_{p}$
$=\frac{220}{11000}\times6000$
$=120$