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Q.

In a transformer. The output current and voltage are respectively 4A and 20V. If the ratio of number of turns in the primary to secondary is 2:1, what is the input current and voltage?

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a

4A,10V

b

8A,10V

c

8A, 40V

d

2A, 40V

answer is A.

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Detailed Solution

$\frac{V_{P}}{V_{S}} = \frac{n_{P}}{n_{S}} = \frac{I_{S}}{I_{P}}$

$I_{P} = I_{S} \frac{n_{S}}{n_{P}} = 4 \times \frac{1}{2} = 2 A$

$V_{P} = \frac{n_{P}}{n_{S}} V_{S} = \frac{2}{1} \times 20 = 40 V$

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