Determine the resistance of the filament of a light bulb with a rated power of 100 W plugged

Determine the resistance of the filament of a light bulb with a rated power of 100 W plugged into a network with a voltage of 220 V.

The current power in the circuit section is calculated by the formula:
P = U * I, where P is the current power (P = 100 W), U is the voltage in the network (U = 220 V), I is the current strength.
According to Ohm’s law: I = U / R, where R is the resistance of the light bulb filament (Ohm).
Let us express and calculate the resistance of the light bulb filament:
R = U * U / P = (U ^ 2) / P = (220 ^ 2) / 100 = 484 ohms.
Check: Ohm = V * V / W = V * V / (V * A) = V / A = Ohm.
Answer: The resistance of the light bulb filament is 484 ohms.