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A transformer having effieciency of 90% ...

A transformer having effieciency of 90% is working on 200 V 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

A

300V,15A

B

450V,15A

C

450V,13.5A

D

600V,15A

Text Solution

Verified by Experts

The correct Answer is:
B
Power of the primary coil, `P_p=V_pI_p`
`thereforeI_p=(3times1000)/200=15A`
Power of the secondary coil , `P_s=V_sI_s`
`thereforeV_s=P_s/I_s=(P_ptimes90/100)/6=3times1000times9/100times1/6=450V`
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Knowledge Check

  • A transformer having effeciency of 90% is working on 200V and 3KW power supply if the current in the secondary coil and the current in the primary coil respectively are

    A
    300V,15A
    B
    450V,15A
    C
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    D
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    A
    16000
    B
    4000
    C
    2000
    D
    1000

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    A
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    B
    200 mA,200mA
    C
    100mA,200mA
    D
    200mA,100mA

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