Current Electricity

Question: The resistance of hot tungsten filament is about 10 times the cold resistance. What will be the resistance of 100 W and 200 V lamp when not in use



1) $400\,\Omega $
2) $200\,\Omega $
3) $40{\rm{ }}\Omega $
4) $20\,\Omega $
Solution: Explanation: No Explanation
Heating Effect of Current Electric Power

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