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PhysicsCurrent ElectricityElectrical PowerMedium2 minPYQ_2005

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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?

Options:

Answer:

Solution:

$R_{hot} = \frac{V ^{2}}{P} = \frac{200 \times 200}{100} = 400Ω$ cold resistance $= R_{hot} /10 = 400/10 = 40Ω$

Stream:JEESubject:PhysicsTopic:Current ElectricitySubtopic:Electrical Power

⏱ 2mℹ️ Source: PYQ_2005

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