First slide

Transformer

Question

The primary winding of a transformer has 100 turns and its secondary winding has 200 turns. The primary is connected to an A.C. supply of 120 V and the current flowing in it is 10 A. The voltage and the current in the secondary are

Easy

A

240 V, 5 A
B

240 V, 10 A
C

60 V, 20 A
D

120 V, 20 A

Solution

$\frac{E_{S}}{E_{p}} = \frac{n_{s}}{n_{p}} or E_{s} = E_{p} \times (\frac{n_{s}}{n_{p}}) \begin{array}{l} ∴ E_{s} = 120 \times (\frac{200}{100}) = 240 V \\ \frac{I_{s}}{I_{p}} = \frac{n_{p}}{n_{s}} or I_{s} = I_{p} (\frac{n_{p}}{n_{s}}) \\ ∴ I_{s} = 10 \times (\frac{100}{200}) = 5 amp \end{array}$

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