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If voltage across a bulb rated 220 volt-...

If voltage across a bulb rated 220 volt-100 watt drops by `2.5 %` of its value, the percentage of the rated value by which the power would decrease is

A

0.05

B

0.1

C

0.2

D

0.025

Text Solution

AI Generated Solution

To solve the problem, we need to determine how a decrease in voltage affects the power consumed by a bulb. Here’s a step-by-step solution: ### Step 1: Understand the relationship between power, voltage, and resistance. The power \( P \) consumed by a bulb can be expressed using the formula: \[ P = \frac{V^2}{R} \] where \( V \) is the voltage across the bulb and \( R \) is the resistance of the bulb. ...
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