| ⇦ |
| ⇨ |
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 dimensional formula for Boltzmann’s constant is
- The current in the coil of inductance 5H decreases at the rate of 2 A/s
- Parsec is the unit of
- When alpha particles captures and electron, then it becomes a
- A wire of length 1 m is placed in a uniform magnetic field of 1.5 tesla at an angle
Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The dimensional formula for Boltzmann’s constant is
- The current in the coil of inductance 5H decreases at the rate of 2 A/s
- Parsec is the unit of
- When alpha particles captures and electron, then it becomes a
- A wire of length 1 m is placed in a uniform magnetic field of 1.5 tesla at an angle
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