First slide

Transformer

Question

A transformer having efficiency of 90% is working on 200V and 3kW power supply. If the current in the secondary coil is 6A, the voltage across the secondary coil and the current in the primary coil respectively are :

Easy

A

300 V, 15A
B

450 V, 15A
C

450 V, 13.5A
D

600 V, 15A

Solution

$η = \frac{V_{s} I_{s}}{V_{p} I_{p}} \Rightarrow 0.9 = \frac{V_{s} (6)}{3 x 10^{3}} \Rightarrow V_{s} = 450 V As V_{p} I_{p} = 3000 so I_{p} = \frac{3000}{200} A = 15 A$

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