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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: - Which of the following is suitable for the fusion process?
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Which of the following is suitable for the fusion process?
- The wavelength of light emitted from second orbit to first orbit in a hydrogen atom is
- An electric dipole is placed at an angle 30°with an electric field intensity 2×10⁵N/C.
- An insulated container of gas has two champers seperated by an insulating partition.
- A wire of length 1 m is placed in a uniform magnetic field of 1.5 tesla at an angle
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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