Question

When a voltage of 120 V is given to the primary of a transformer the current in the primary is 1.85 mA. Find the voltage across the secondary when it gives a current of 150 mA. The efficiency of the transformer is 95%.

Answer 1

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Answer 2

Given :

A voltage of 120 V is given to the primary of a transformer the current in the primary is 1.85 mA .

Efficiency of the transformer is 95 % .

To Find :

The voltage across the secondary when it gives a current of 150 mA .

Solution :

We know , in a transformer primary and secondary voltage and current is related as :

$\dfrac{V_1}{V_2}=n\dfrac{I_2}{I_1}\\\\V_2=\dfrac{1}{n}\times \dfrac{V_1I_1}{I_2}\\\\V_2=\dfrac{100}{95}\times \dfrac{120\times 1.85}{150}\\\\V_2=1.56\ V$

Therefore , the voltage across the secondary is 1.56 V .

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Transformer

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