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NEET 2014

Exam: NEET
Year: 2014
Subject: Physics
Chapter: Alternating Current

NEET 2014 · Physics · Alternating Current

A transformer having efficiency of 90% is working on 200V and 3kW...

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:

Options

A $300V, 15A$
B $450V, 15A$
C $450V, 13.5A$
D $600V, 15A$

Correct answer

B. $450V, 15A$

Step-by-step solution

Current in primary coil

= \dfrac{P}{V} = \dfrac{3000}{200} = 15A

{P}_{out} = η%of{P}_{in}

{V}_{2}{i}_{2} = \dfrac{90}{100} \times \left(3000\right)<br />\left({V}_{2}\right)\left(6\right) = 2700

{V}_{2} = 450volt

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