| ⇦ | 
| ⇨ |
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: - What is the energy of He⁺ electron in first orbit?
- A current of 5 A is passing through a metallic wire of cross-sectional area 4×10⁻⁶ m².
- A liquid wets a solid completely. The meniscus of the liquid in a sufficiently long
- A particle of mass m is driven by a machine that delivers a constant power k watts
- Laser light is considered to be coherant because it consists of
Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- What is the energy of He⁺ electron in first orbit?
- A current of 5 A is passing through a metallic wire of cross-sectional area 4×10⁻⁶ m².
- A liquid wets a solid completely. The meniscus of the liquid in a sufficiently long
- A particle of mass m is driven by a machine that delivers a constant power k watts
- Laser light is considered to be coherant because it consists of
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