An electric bulb is rated at 220V-200W. What is the resistance of the filament?
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The resistance varies greatly depending upon the temperature of the filament.At
operating temperature of approximately 3000 degrees Centigrade, the
resistance can be computed by the equation R = V^2/W or some 484 ohms.However you will NEVER be able to measure this with a multimeter.At room temperature, a tungsten filament is much lower resistance. Likely 10–20 ohms or so.
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484 ohm
By using,
R=V*2/W
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