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 $
