In an a.c circuit the e.m.f. (e) and the current (i) at any instant are given

In An Ac Circuit The Emf E And The Current Physics Question

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:

  1. Three resistances 2Ω, 3Ω and 4Ω are connected in parallel. The ratio of currents passing
  2. A boy is trying to start a fire by focusing sunlight on a piece of paper using
  3. The magnetic lines of force inside a bar magnet
  4. At which place, Earth’s magnetism becomes horizontal
  5. The potential differences across the resistance, capacitance and inductance

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.

NEETLab Mobile App

Share this page with your friends

Be the first to comment

Leave a Reply

Your email address will not be published.


*