Electro Magnetic Induction And Alternating Currents Question 262

Question: A step-down transformer is connected to main supply 200V to operate a 6V, 30W bulb. The current in primary is [AMU (Engg.) 1999]

Options:

A) 3 A

B) 1.5 A

C) 0.3 A

D) 0.15 A

Show Answer

Answer:

Correct Answer: D

Solution:

$ V_{p}=200\ V,\ \ V_{s}=6V $

$ P_{out}=V_{s}i_{s}\Rightarrow 30=6\times i_{s}\Rightarrow i_{s}=5\ A $

From $ \frac{V_{s}}{V_{p}}=\frac{i_{p}}{i_{s}}\Rightarrow \frac{6}{200}=\frac{i_{p}}{5}\Rightarrow i_{p}=0.15\ A $



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