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Is Ohm's law universally applicable for ...

Is Ohm's law universally applicable for all condcuting elements? If not, give examples of elements which do not obey Ohm's law.

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Ohm's law is not applicable for non-ohmic elements. For example, vaccum tubes, semi conducting diode, liquid electrolyte etc.
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Answer the following questions: (a) A steady current flows in a metallic conductor of non-uniform cross-section. Which of these quantities is constant along the conductor: current, current density electric field, drift speed ? (b) Is Ohm's law universally applicable for all cnducting elements ? If not, give examples of elements which do not obey Ohm's law. (c ) A low voltage suply from which one needs high currents must have very low internal resistance.Why (d) A high tension (HT) supply of say, 6kV must have a very large internal resistance, Why ?

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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-CURRENT ELECTRICITY -ADDITIONAL EXERCISES
  1. A secondary cell after long use has an emf of 1.9 V and a large intern...

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  2. Two wires of equal length, one of aluminium and the other of copper ha...

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  3. What conclusion can you draw from the following observations on a resi...

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  4. A steady current flows in a metallic conductor of non-uniform cross-se...

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  5. Is Ohm's law universally applicable for all condcuting elements? If no...

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  6. A low voltage supply from which one needs high currents must have very...

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  7. A high tension (HT) supply of, say 6 Kv must have a very large interna...

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  8. Choose the correct alternative: (a) Alloys of metals usually have (g...

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  9. (a) Given n resistors each of resistance R, how will you combine them ...

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  10. Given the resistances of 1 Omega, 2 Omega, 3 Omega how will be combine...

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  11. Determine the equivalent resistance of networks shown in Fig.

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  12. Determine the current drawn from a 12 V supply with internal resistanc...

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  13. Figure shows a potentiometer with a cell of 2.0 V and internal resista...

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  14. Figure shows a potentiometer with a cell of 2.0 V and internal resista...

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  15. Figure shows a potentiometer with a cell of 2.0 V and internal resista...

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  16. Figure shows a potentiometer with a cell of 2.0 V and internal resista...

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  17. Figure shows a potentiometer with a cell of 2.0 V and internal resista...

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  18. Figure shows a potentiometer with a cell of 2.0 V and internal resista...

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  19. Figure shows a potentiometer circuit for comprasion of two resistances...

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  20. Figure shows a 2.0 V potentiometer used for the determination of inter...

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