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A step-up transformer operates on a 230 ...

A step-up transformer operates on a 230 V line and supplies a current of 2A. The ratio of primary and secondary winding is `1:25`. The primary current is

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Using the relation `(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)=2A`
Current in primary, `I_(P)=25xx2=50A`
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