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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 ?
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
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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
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