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Write an expression connecting the resis...

Write an expression connecting the resistance of a wire and specific resistance of its material. State the meaning of the symbols used.

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ICSE-CURRENT ELECTRICITY-EXERCISE-8(A)
  1. How does the resistivity of a consuctor depend upon temperature and el...

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  2. Two wires, one of copper and the other of iron, are of the same length...

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  3. Name three factors on which resistance of a given wire depends and sta...

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  4. Define the term "specific resistance and state its S.I. unit.

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  5. Write an expression connecting the resistance of a wire and specific r...

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  6. State the order of specific resistance of a metal,

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  7. State the order of specific resistance of a semiconductor

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  8. State the order of specific resistance of an insulator

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  9. (a) Name two factors on which the specific resistance of a wire depend...

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  10. Name a substance of which the specific resistance remains almost uncha...

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  11. How does the specific resistance of a semi-conductor change with the i...

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  12. How does (a) resistance, and (b) specific resistance of a wire depend ...

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  13. Name the material used for making connection wires. Give a reason for ...

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  14. Why should a connection wire be thick ?

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  15. Name a material which is used for making a standard resistor. Give a r...

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  16. Name the material used for making a fuse wire. Give a reason.

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  17. Name the material used for filament of an electric bulb,

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  18. Name the material used for heating element of a room heater.

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  19. What is a superconductor ? Give one example of it.

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  20. A substance has nearly zero resistance at a temperature of 1 K What is...

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