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A transformer having efficiency of 90% i...

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

A

300 V, 15 A

B

450 V, 15 A

C

450 V, 13.5 A

D

600 V, 15 A

Text Solution

Verified by Experts

The correct Answer is:
B
Initial power = 3kW = 3000 W
As efficiency is `90%`, then final power
`=3000 xx 90/100 = 2700W`
`rArr P_(1)= V_(1)I_(1)= 3000` W ................(i)
`P_(2)= V_(2)I_(2)= 2700` ..............(ii)
`V_(s) = i2700/6 = 900/2 = 450` V
and `I_(1) = 3000/200` = 15 A
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