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Of metals and alloys,which has greater v...

Of metals and alloys,which has greater value of temperature coefficient of resistance?

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What is the unit of temperature coefficient of resistance?

What is the nature of temperature coefficient of resistance of a semiconductor?

Name any one material having a small value of temperature coefficient of resistance.Write one use of this material.

The resistance of a copper wire at 20^@C is 3 Omega and at 100^@ is 3.94 Omega .Determine the temperature coefficient of resistance of copper.

The resistance R of a conducting wire depends on its material , length l and area of cross section A. The resistivity of the material of the wire is rho=(RA)/t the value of rho is for different materials .It is very low for conducting materials like metals,Besides, the resistance of a conductor also depends on its temperature. IF the resistance of a conductor is R_0 at 0^@C and R_1 at t^@C , then R_1=R_0(1+at) where a is called the temperature coefficient of resistance. The resistance increases with temperature for metallic conductors but decreases for graphite,a few metal alloys,and for semiconductors like silicon and germanium. The temperature coefficient of resistance of a semiconductor is

At what temperature the resistance of a copper wire will become three times its value at 0^@C ? Temperature coefficient of resistance for copper 4xx10^(-3)//C

Can the value of the coefficient of friction be greater than 1?

An electric toaster uses nichrome for its heating element. When a negligibly small current passes through it, its resistance at room temperature (27.0^@C is found to be 75.3Omega When the toaster is connected to a 230V supply, the current settles, after.a few seconds, to a steady value of 2.68A. What is the steady temperature of the nichrome element ? The temperature coefficient of resistance averaged over the temperature range involved, is 1.70xx10^(-4)//C^@

CHHAYA PUBLICATION-CURRENT ELECTRICITY -EXERCISE ( VERY SHORT ANSWER TYPE QUESTION)
  1. A carbon resistor is coloured with four different bands=brown,black,or...

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  2. Resistance of a carbon resistor is 6.8 k Omega.What is the first three...

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  3. Of metals and alloys,which has greater value of temperature coefficien...

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  4. How are different electrical appliances connected In domestic electric...

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  5. Two resistances 1 Omega and 2 Omega are connected in series and a pote...

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  6. Two resistances 1 Omega and 2 Omega are connected in parallel and a p...

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  7. What is the value of I in the circuit of Fig.1.64?

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  8. Equivalent resistance in a parallel combination is ...... than each of...

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  9. Two resistance of 6 Omega and 3 Omega are connected in parallel when ...

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  10. A metallic wire of resistance R is folded into two equal parts and the...

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  11. The resistance of an electrical appliance is 200 Omega and it can with...

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  12. The equivalent resistance of two resistances in series is four times t...

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  13. Three resistances,each of 4 Omega, are connected in the form of an equ...

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  14. Name the quantity for which the potential difference of a cell becomes...

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  15. What is the maximum value of current available from a cell of emf 1.5 ...

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  16. IF the through a circuit or the of a cell be zero, then the value of ...

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  17. Emf, of a cell is 1.5 Vand its internal resistance is 1 Omega When the...

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  18. When a stunt of 1 Omega is connected in parallel with a galvanometer 1...

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  19. If the current through a galvanometer of resistance G is to be reduced...

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  20. A shunt of 1 Omega is connected in parallel with a galvanometer of res...

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