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The average temeprature coefficient of t...

The average temeprature coefficient of tungsten is `5.1xx10^(-3)//.^(@)C`. The filament of an electric at lamp has a cold resistance of `9.7 Omega at 20^(@)C`. When glowing fully it has a resistance of `121Omega`. Calculate its temperature. If is a 100-watt lamp, what current does it consume?

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The correct Answer is:
`2499^(@)C,32A` when cold and 0.91A when hot
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NN GHOSH-HEATING AND CHEMICAL EFFECT OF CURRENT-EXAMPLE B
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  10. A steady current is passed for 25minutes through a silver voltameter a...

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  16. A dynamo of emf varepsilon(1)=120V and internal resistance r=0.5Omega,...

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  18. In the cirucit (figure6.3) resistance R(1) and R(2) are known and cell...

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  19. A capacitor of capacitance C is charged to a voltage V(0) and subseque...

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