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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: - When the disc rotates with uniform angulr velocity.Which of the following is not true?
- 6Ω and 12Ω resistors are connected in parallel. This combination is connected
- 24 cells of emf 1.5 V each having internal resistance of 1 ohm are connected
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- When the disc rotates with uniform angulr velocity.Which of the following is not true?
- 6Ω and 12Ω resistors are connected in parallel. This combination is connected
- 24 cells of emf 1.5 V each having internal resistance of 1 ohm are connected
- Light of two different frequencies whose photons have energies 1eV
- Given the value of Rydberg constant is 10⁷ m⁻¹, the wave number of the last line
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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