Question

A 440 W, 220 V is marked on an electric bulb. The resistance of the filament of the bulb will be:

• A. 100 ohm
• B. 225 ohm
• C. 115 ohm
• D. 110 ohm

Hint:

To find the resistance of an electric bulb, use the formula \( R = \frac{V^2}{P} \), where \(V\) is the voltage and \(P\) is the power.

Answer 1

The Correct Option is D

Using the formula for electrical power, \(P = \frac{V^2}{R}\), where \(P\) is the power, \(V\) is the voltage, and \(R\) is the resistance, we can calculate the resistance as:
\[ R = \frac{V^2}{P} = \frac{220^2}{440} = 110 \text{ ohm}. \]