Question

An electric bulb is marked 100 W 220 V. its resistance is

• A. 484 $\Omega$
• B. 100 $\Omega$
• C. 220 $\Omega$
• D. 48 $\Omega$

Answer 1

Answer: (A)

484 $\Omega$

We know that:
$P=\frac{V^2}{R}$
Substituting value we get,
Resistance $=484Ohm$