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A 220 volts input is supplied to a transformer. The output circuit draws a current of 2.0 ampere at 440 volts. If the efficiency of the transformers is 80%, the current drawn by the primary windings of the transformer is
Options
(a) 3.6 ampere
(b) 2.8 ampere
(c) 2.5 ampere
(d) 5.0 ampere
Correct Answer:
5.0 ampere
Explanation:
V₂ / V₁ = 0.8 I₁ / I₂
V₂I₂ / V₁I₁= 0.8
V₁ = 220 V, I₂ = 2.0 A, V₂ = 440 V
I₁ = V₂I₂ / V₁ x 10/8 = 440 x 2 x 10 / 220 x 8
= 5.0 A
Related Questions: - In a coil having e.m.f. of 8 V induced for 0.05 s. The value of current changes
- A wheel has angular acceleration of 3.0 rad/sec² and an initial angular speed of 2.00
- A wire is suspended vertically from one of its ends is stretched by attaching a weight
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In a coil having e.m.f. of 8 V induced for 0.05 s. The value of current changes
- A wheel has angular acceleration of 3.0 rad/sec² and an initial angular speed of 2.00
- A wire is suspended vertically from one of its ends is stretched by attaching a weight
- A step-up transformer operates on a 230 V line and supplies a current of 2 A.
- The ratio of speed of an electron in ground state in Bohr’s first orbit of hydrogen atom
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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