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Question

In a step up transformer, the ratio of turns of primary to secondary is 5:6 and the primary voltage is 410 V. If the current in the primary is 4 A, then what is the load current?


A

1.15 A

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B

2.15 A

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C

3.33 A

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D

4.33 A

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Solution

The correct option is C

3.33 A


Consider,
V1: Voltage across the primary coil
V2: voltage across the secondary coil
N1 : Number of turns in primary coil
N2: Number of turns in secondary coil

So, the relation between these terms:-

V1N1 = V2N2

The turn ratio of the transformer is :-

N1N2=V1V2

N1N2=56;V1V2=N1N2

410V2=56

V2=492 V

We have known that,
V1I1=V2I2
I2=V1I1V2=410×4492 = 3.33 A


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