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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: - The moment of inertia of a uniform circular disc of radius R and mass M about an axis
- A transformer rated at 10 kW is used to connect a 5 kV transmission line to a 240 V
- A simple pendulum has a time period T₁ when on the earth’s surface and T₂ When taken
- Light of two different frequencies whose photons have energies 1eV
- A metal wire of circular cross-section has a resistance R₁. The wire is now stretched
Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The moment of inertia of a uniform circular disc of radius R and mass M about an axis
- A transformer rated at 10 kW is used to connect a 5 kV transmission line to a 240 V
- A simple pendulum has a time period T₁ when on the earth’s surface and T₂ When taken
- Light of two different frequencies whose photons have energies 1eV
- A metal wire of circular cross-section has a resistance R₁. The wire is now stretched
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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