Electro Magnetic Induction And Alternating Currents Question 266
Question: In a step-up transformer the turn ratio is 1:10. A resistance of 200 ohm connected across the secondary is drawing a current of 0.5 A. What is the primary voltage and current [MP PET 2000]
Options:
A) 50 V, 1 amp
B) 10 V, 5 amp
C) 25 V, 4 amp
D) 20 V, 2 amp
Show Answer
Answer:
Correct Answer: B
Solution:
$ N_{p}:N_{s}=1:10 $
and $ V_{s}=0.5\times 200=100\ V $
$ \frac{V_{s}}{V_{p}}=\frac{N_{s}}{N_{p}}\Rightarrow \frac{100}{V_{p}}=\frac{10}{1}\Rightarrow V_{p}=10\ V $
$ \frac{i_{p}}{i_{s}}=\frac{N_{s}}{N_{p}}\Rightarrow \frac{i_{p}}{0.5}=\frac{10}{1},\ i_{p}=5\ amp $
