The resistance of hot filament of the bulb is about 10 times the cold resistance.
What will be the resistance of 100W – 220V lamp, when not in use?
(a) 48Ω (b) 400Ω (c) 484Ω (d) 48.4Ω IF YOU KNOW PLEASE GIVE ME VERIFIED ANSWER............ PLEASE DON'T PUT IRRELEVANT ANSWER'S
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Answer:
d) 48.4 ohms
Explanation:
The hot resistance = V^2 / P = 220^2 / 100
= 484 ohms
Cold resistance = 484 / 10 = 48.4 ohms
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