Electro Magnetic Induction And Alternating Currents Question 281

Question: A step-down transformer is used on a 1000 V line to deliver 20 A at 120 V at the secondary coil. If the efficiency of the transformer is 80% the current drawn from the line is [Kerala PET 2005]

Options:

A) 3 A

B) 30 A

C) 0.3 A

D) 2.4 A

Show Answer

Answer:

Correct Answer: A

Solution:

$ \eta =\frac{\text{Output}}{\text{Input}} $

Þ $ \frac{80}{100}=\frac{20\times 20}{1000\times i_{l}} $



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