The correct option is D 16 ANumber #10;of turns in the primary , Np = 100 #10; #10;Number #10;of turns in the secondary , Ns = 25 #10; #10;Current ...

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Byju's Answer

Standard X

Physics

Primary, Secondary Voltages in Transformer

A 100

Question

A 100 % efficiency transformer has 100 turns in the primary and 25 turm coil. If the current in the secondary coil is 4 A, then the current in the primary coil is

1 A

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4 A

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8 A

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16 A

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Solution

The correct option is D 16 A
Number of turns in the primary , Np = 100

Number of turns in the secondary , Ns = 25

Current in the secondary coil ,Is = 4 amp

we have to find out current in the primary coil ,Ip = ?

∵ Ns/Np = Vs/Vp

Also , Vs × is = Vp × ip

Then, Ns/Np = Ip/is

⇒100/25 =Ip/4

⇒4 × 4 = Ip

⇒ Ip = 16 amp

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