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Q.

A step-down transformer is connected to main supply 200V to operate a 6V, 30W bulb. The current in primary is

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a

3 A

b

1.5 A

c

0.3 A

d

0.15 A

answer is D.

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Detailed Solution

Vp=200V,Vs=6VPout =Vsis⇒30=6×is⇒is=5A From VsVp=ipis⇒6200=ip5⇒ip=0.15A
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