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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 galvanometer has a coil of resistance 100 ohm and gives a full-scale deflection
- Which of the following quantities has units but not dimensions
- At a given temperature the root mean square velocities of oxygen and hydrogen
- If a magnetic substance is brought near the north or the south pole of a bar magnet
- A cord is wound round the circumference of wheel of radius
Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A galvanometer has a coil of resistance 100 ohm and gives a full-scale deflection
- Which of the following quantities has units but not dimensions
- At a given temperature the root mean square velocities of oxygen and hydrogen
- If a magnetic substance is brought near the north or the south pole of a bar magnet
- A cord is wound round the circumference of wheel of radius
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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