Q.
A transformer having efficiency of 90% is working on 200 V and 3 kW power supply. If the current in the secondary coil is 6 A, the voltage across the secondary coil and the current in the primary coil respectively are
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a
300 V, 15 A
b
450 V, 15 A
c
450 V, 13.5 A
d
600 V, 15 A
answer is