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JEE Exam  >  JEE Questions  >   A 220 V input is supplied to a transformer. ... Start Learning for Free
A 220 V input is supplied to a transformer. The output circuit draws a current of 2.0 A at 440 V. If the ratio of output to input power is 0.8, then the current drawn by primary winding is
  • a)
    3.6 A
  • b)
    5.0 A
  • c)
    2.5 A
  • d)
    2.8 A
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
A 220 V input is supplied to a transformer. The output circuit draws ...
Given, input voltage supplied to the transformer, V1 = 220 V
Current at output circuit of transformer, i2 = 2A
V2 = 440V
Hence, the current drawn by the primary windings is 5A.
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Community Answer
A 220 V input is supplied to a transformer. The output circuit draws ...
Given Data:
- Input voltage (V1) = 220 V
- Output voltage (V2) = 440 V
- Output current (I2) = 2.0 A
- Ratio of output to input power (P2/P1) = 0.8

Calculation:
- Power in the primary winding (P1) = V1 * I1
- Power in the secondary winding (P2) = V2 * I2
- Given, P2/P1 = 0.8

Using the formula for power:
- P2/P1 = (V2 * I2) / (V1 * I1)
- 0.8 = (440 * 2.0) / (220 * I1)
- 0.8 = 880 / (220 * I1)
- I1 = 880 / (220 * 0.8)
- I1 = 5.0 A

Conclusion:
The current drawn by the primary winding is 5.0 A. Therefore, option B is the correct answer.
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A 220 V input is supplied to a transformer. The output circuit draws a current of 2.0 A at 440 V. If the ratio of output to input power is 0.8, then the current drawn by primary winding isa)3.6 Ab)5.0 Ac)2.5 Ad)2.8 ACorrect answer is option 'B'. Can you explain this answer?
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