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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 charges each equal to 2µ C are 0.5m apart. If both of them exist inside vacuum
- An ideal coil of 10 H is connected in series with a resistance of 5Ω and a battery
- A capacitor of 2.5 μF is charged through a resistor of 4 MΩ. In how much time
- A capacitor having a capacity of 2 μF is charged to 200V and then the plates
- An automobile moves on a road with a speed of 54 km h⁻¹. The radius of its wheels
Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two charges each equal to 2µ C are 0.5m apart. If both of them exist inside vacuum
- An ideal coil of 10 H is connected in series with a resistance of 5Ω and a battery
- A capacitor of 2.5 μF is charged through a resistor of 4 MΩ. In how much time
- A capacitor having a capacity of 2 μF is charged to 200V and then the plates
- An automobile moves on a road with a speed of 54 km h⁻¹. The radius of its wheels
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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