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Resistance of an incandescent filament o...

Resistance of an incandescent filament of a bulb is comparatively much more than that when it is at room temperature. Why?

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The rise in temperature causes a rise in the vibration of the atoms in the filament, increasing the collision between the atoms and the flowing electrons. The increase in collision decreases the rate of flow of electrons and hence increases the resistance.
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ZEN PUBLICATION-ELECTRICITY-ZEN ADDITIONAL QUESTIONS SECTION (VERY SHORT ANSWER TYPE QUESTIONS)
  1. What is the SI unit of [i] electric energy, and [ii] electric power?

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  2. Explain why, filament type electric bulbs are not power efficient.

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  3. Resistance of an incandescent filament of a bulb is comparatively much...

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  4. What happens to the other bulbs in series circuit, if one bulb blows o...

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  5. Calculate the number of electrons constituting one coulomb of charge.

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  6. State the relationship between 1 ampere and 1 coulomb.

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  7. State the relationship between 1 volt and 1 joule.

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  8. Would electrons move from higher potentials to lower potentials or vic...

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  9. Why is a voltmeter connected in parallel across a circuit element?

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  10. What is the SI unit of potential difference ? Name the device used to ...

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  11. What is meant by saying that the electric potential at a point is Ivol...

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  12. How much work is done when one coulomb charge moves against a potentia...

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  13. What is the SI unit of electric current?

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  14. Compare how an ammeter and a voltmeter are connected in a circuit.

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  15. What is the current in a circuit if the charge passing through each po...

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  16. Name the unit of electrical resistance and give its symbol.

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  17. A resistance of 20 ohms has a current of 2 amperes flowing in it. What...

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  18. A current of 5 amperes flows through a wire whose ends are at a potent...

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  19. Give the law of combination of resistances in series.

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  20. State the law of combination of resistances in parallel.

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