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If voltage across a bulb rated 220 volt-100 Watt drops by 2.5% of its rated value, the percentage of the rated value by which the power would decrease is:
Options
(a) 20%
(b) 2.50%
(c) 5%
(d) 10%
Correct Answer:
5%
Explanation:
Resistance of bulb is constant
P = V² / R
∆p / p = 2∆V / V + ∆R / R
∆p / P = 2 x 2.5 + 0 = 5%
Related Questions: - Two radiations of photons energies 1 eV and 2.5 eV, successively
- A source of light is placed at a distance of 50 cm from a photocell and the stopping
- If r be the distance of a point on the axis of a magnetic dipole from its centre
- Cathode rays are produced when the pressure is of the order of
- A pellet of mass 1 g is moving with an angular velocity of 1 rad/s along a circle
Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two radiations of photons energies 1 eV and 2.5 eV, successively
- A source of light is placed at a distance of 50 cm from a photocell and the stopping
- If r be the distance of a point on the axis of a magnetic dipole from its centre
- Cathode rays are produced when the pressure is of the order of
- A pellet of mass 1 g is moving with an angular velocity of 1 rad/s along a circle
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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