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A step up transformer operates on a 230 ...

A step up transformer operates on a `230 V` line and a load current of 2 ampere. The ratio of the primary and secondary windings is `1 : 25`. What is the current in the primary?

Text Solution

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`(N_(P))/(N_(S)) = (I_(S))/(I_(P)), I_(P) = (N_(S)I_(S))/(N_(P))`
Here `N_(p)//N_(s) = 1//25` (or) `N_(s)//N_(p) = 25//1 = 25`
and `I_(s) = 2 A`
Current in primary, `I_(P) = 25 xx 2 = 50 A`
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