| ⇦ | 
| ⇨ |
In an a.c circuit the e.m.f. (e) and the current (i) at any instant are given respectively by
e = E₀ sin ?t
i = I₀ sin (?t – ?)
The average power in the circuit over one cycle of a.c. is
Options
(a) E₀I₀ / 2
(b) E₀I₀ / 2 sin ?
(c) E₀I₀ / 2 cos ?
(d) E₀I₀
Correct Answer:
E₀I₀ / 2 cos ?
Explanation:
The average power in the circuit over one cycle of a.c. is given by
Pₐᵥ = eᵣₘₛ x iᵣₘₛ x cos ?
= E₀ / √2 x I₀ / √2 x cos ? = E₀I₀ / 2 cos ?
Related Questions: - The de-Broglie wavelength of an electron is the same as that of a 50 KeV X-ray photon.
- The work function for aluminium is 4.125 eV. The cutoff wavelength for photoelectric
- The binding energy per nucleon in deuterium and helium nuclei are 1.1 MeV and 7.0 MeV
- The physical quantities not having same dimensions are
- If two charges +4e and +e are at a distance x apart, then at what distance charge q
Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The de-Broglie wavelength of an electron is the same as that of a 50 KeV X-ray photon.
- The work function for aluminium is 4.125 eV. The cutoff wavelength for photoelectric
- The binding energy per nucleon in deuterium and helium nuclei are 1.1 MeV and 7.0 MeV
- The physical quantities not having same dimensions are
- If two charges +4e and +e are at a distance x apart, then at what distance charge q
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