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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 ?
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A circular disc X of radius R is made from an iron plate of thickness t and another disc
- If a star converts all helium in its core to oxygen, then energy released per oxygen
- A short bar magnet of magnetic moment 0.4 JT⁻¹ is placed in a uniform magnetic field
- A force of 10 newton acts on a body of mass 20 kg for 10 seconds. Change in its momentum
- Two poles of same strength attract each other with a force of magnitude F
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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