Question

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

A
25 A
B
50 A
C
15 A
D
12.5 A

Solution

## The correct option is B $$50$$ A$$\dfrac{I_p}{I_s}=\dfrac{N_s}{N_p}$$$$\Rightarrow \dfrac{I_p}{2}=\dfrac{25}{1}$$$$\Rightarrow I_p=50A$$.PhysicsNCERTStandard XII

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