Electromagnetic Induction and Alternating Current 7 Question 2
2. A power transmission line feeds input power at to a step-down transformer with its primary windings having 4000 turns. The output power is delivered at by the transformer. If the current in the primary of the transformer is and its efficiency is , the output current would be
(Main 2019, 9 Jan II)
(a)
(b)
(c)
(d)
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Answer:
Correct Answer: 2. (a)
Solution:
- For a transformer, there are two circuits which have
and (number of coil turns), and (currents) respectively as shown below.
Here, input voltage,
Number of turns in primary coil,
Output voltage,
Output power,
Input power,