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Thursday, 28 November 2013

Q.No.13.5: - What are the difficulties in testing whether the filament of a lighted bulb obeys Ohm’s law?

Q.No.13.5: - What are the difficulties in testing whether the filament of a lighted bulb obeys Ohm’s law?

Ans: - According to Ohm when we increase voltage then current will also increases in direct proportion but resistance of the conductor must remain same and hence temperature also must remain same or constant. But when we test the filament of a lighted bulb that either it obeys Ohm’s law or not then with the passage of time its temperature increases and resistance also increases. These are the difficulties in testing whether filament of a lighted bulb obeys Ohm’s law or not.

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