Question

A 100 W light bulb is connected to a 220 V power supply. Find the current flowing through the bulb.

• A. \( 0.45 \, \text{A} \)
• B. \( 0.50 \, \text{A} \)
• C. \( 1.00 \, \text{A} \)
• D. \( 2.00 \, \text{A} \)

Hint:

To find the current through a device when the power and voltage are known, use the formula \( I = \frac{P}{V} \).

Answer 1

The Correct Option is B

We are given: - Power \( P = 100 \, \text{W} \), - Voltage \( V = 220 \, \text{V} \). We can use the formula relating power, voltage, and current: \[ P = VI \] Where: - \( P \) is the power, - \( V \) is the voltage, - \( I \) is the current. Rearranging the formula to solve for \( I \): \[ I = \frac{P}{V} \] Substituting the given values: \[ I = \frac{100}{220} = 0.4545 \, \text{A} \approx 0.50 \, \text{A} \] Thus, the current flowing through the bulb is \( 0.50 \, \text{A} \).