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Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityMicroscopicMedium2 minQB

PhysicsMediumsingle choice

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:Microscopic

⏱ 2mℹ️ Source: QB

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