| ⇦ | 
| ⇨ |
The instantaneous values of alternating current and voltages in a circuit are given as
i = 1/√2 sin (100πt) amper
e = 1/√2 sin (100πt + π/3) Volt
The average power in Watts consumed in the circuit is:
Options
(a) 1/4
(b) √3 / 4
(c) 1/2
(d) 1/8
Correct Answer:
1/8
Explanation:
The average power in the circuit where cos ? = power factory
= Vᵣₘₛ x Iᵣₘₛ cos ?
? = π/3 = phase difference = 180/3 = 60
Vᵣₘₛ = 1/√2 / √2 = 1/2 volt
Iᵣₘₛ = 1/√2 / √2 = (1/2) A
cos ? = cos π/3 = 1/2
= 1/2 x 1/2 x 1/2 = 1/8 W
Related Questions: - 4.0 g of a gas occupies 22.4 litres at NTP. The specific heat capacity of the gas
- The ionisation energy of an electron in the ground state of helium atom is 24.6 eV.
- A piece of iron is heated in a flame. It first comes dull red then becomes reddish
- A thermally insulated rigid container contains an ideal gas heated by a filament
- The intensity of magnetisation of a bar magnet is 5×10⁴ Am⁻¹. The magnetic length
Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- 4.0 g of a gas occupies 22.4 litres at NTP. The specific heat capacity of the gas
- The ionisation energy of an electron in the ground state of helium atom is 24.6 eV.
- A piece of iron is heated in a flame. It first comes dull red then becomes reddish
- A thermally insulated rigid container contains an ideal gas heated by a filament
- The intensity of magnetisation of a bar magnet is 5×10⁴ Am⁻¹. The magnetic length
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