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In a step-down transformer having primar...

In a step-down transformer having primary to secondary turn ratio 10:1, the input voltage applied is 250V and outout current is 10 A. Assuming 100% efficiency, calculate the
(i) voltage across secondary coil
(ii) current in primary coil
(iii) power output

Text Solution

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Given, `N_(S)/N_(P) = 1/10,V_(P)=250V, I=8A`
i) `V_(S)/V_(P)=N_(S)/N_(P) rArr V_(S) = N_(S)/N_(P) xx V_(P) = 1/10 xx 250 = 25V`
ii) `I_(P)/I_(S) = N_(S)/N_(P)rArr I_(P) = N_(S)/N_(P)I_(S) = 1/10 xx 10 = 1A`
iii) Power output=`V_(S)I_(S) = 25 xx 10 = 250W`
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