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A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 amp, the efficiency of the transformer is approximately
Options
(a) 50%
(b) 90%
(c) 10%
(d) 30%
Correct Answer:
90%
Explanation:
? = P output / P input x 100
= 100 / 220 x 0.5 = 90.9%
Related Questions: - A coil of self-inductance L is connected in series with a bulb B and an AC source
- Two spherical conductors A and B of radii 1 mm and 2 mm are separated by a distance
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A coil of self-inductance L is connected in series with a bulb B and an AC source
- Two spherical conductors A and B of radii 1 mm and 2 mm are separated by a distance
- A particle moves along a circle of radius 20/π m with constant tangential acceleration
- A student measures the terminal potential difference (V) of a cell
- If λ₁ and λ₂ are the wavelengths of the first members of the Lyman and Paschen
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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