| ⇦ | 
| ⇨ |
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: - Which is incorrect about thermal process
- One-fourth length of a spring of force constant K is cut away. The force constant
- Radius of a soap bubble is increased from R to 2R. Work done in this process
- The kinetic energy of particle moving along a circle of radius R depends
- A particle of unit mass undergoes one-dimensional motion such that its velocity varies
Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Which is incorrect about thermal process
- One-fourth length of a spring of force constant K is cut away. The force constant
- Radius of a soap bubble is increased from R to 2R. Work done in this process
- The kinetic energy of particle moving along a circle of radius R depends
- A particle of unit mass undergoes one-dimensional motion such that its velocity varies
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