Electro Magnetic Induction And Alternating Currents Question 251

Question: A 100% efficient transformer has 100 turns in the primary and 25 turns in its secondary coil. If the current in the secondary coil is 4 amp, then the current in the primary coil is [MP PMT 1990]

Options:

A) 1 amp

B) 4 amp

C) 8 amp

D) 16 amp

Show Answer

Answer:

Correct Answer: A

Solution:

For 100% efficient transformer

$ V_{s}i_{s}=V_{p}i_{p}\Rightarrow \frac{V_{s}}{V_{p}}=\frac{i_{p}}{i_{s}}=\frac{N_{s}}{N_{p}} $
$ \Rightarrow \frac{i_{p}}{4}=\frac{25}{100}\Rightarrow i_{p}=1\ A $



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