| ⇦ | 
| ⇨ |
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: - Ist law of thermadynamics is based on
- A simple pendulum performs simple harmonic motion about x = 0 with an amplitude
- The approximate depth of an ocean is 2700 m. The compressibility of water is
- The parallel beams of monochromatic light of wavelength 4.5 x10⁻⁷ m passes through
- Perfectly black body radiates the energy 18 J/s at 300K. Another ordinary body of e=0.8
Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Ist law of thermadynamics is based on
- A simple pendulum performs simple harmonic motion about x = 0 with an amplitude
- The approximate depth of an ocean is 2700 m. The compressibility of water is
- The parallel beams of monochromatic light of wavelength 4.5 x10⁻⁷ m passes through
- Perfectly black body radiates the energy 18 J/s at 300K. Another ordinary body of e=0.8
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply