1.

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

Answer»

15 A
50 A
25 A
12.5 A

Solution :`(E_(P))/(E_(S))=(N_(P))/(N_(S))=E_(S)=(E_(P)xx NS)/(N_(P))rArr E_(S)=5750 V`
`I_(S)=2 amp, P_(S)=2xx5750 W`
`therefore I_(P)=(P_(P))/(V_(P))=(P_(S))/(V_(P))=(2xx5750)/(230)=50 A`.


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