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A low voltage supply from which one need...

A low voltage supply from which one needs high currents must have very low internal resistance. Why ?

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Because `I = (epsilon)/(R + r)` (Where R = external resistance )
When R is constant, we can increase the value of I by decreasing value of internal resistance r.
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KUMAR PRAKASHAN-CURRENT ELECTRICITY-SECTION [B] (NUMERICAL FROM TEXTUAL EXERCISE)
  1. In a potentiometer arrangement, a cell of emf 1.25 V gives a balance p...

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  2. The number density of free electrons in a copper conductor estimated ...

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  3. The earth's surface has a negative surface charge density of 10^(-9)C ...

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  4. (a) Six lead-acid type of secondary cells each of emf 2.0 V and intern...

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

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  6. What conclusion can you draw from the follwing observation on a resist...

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

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  8. Is Ohm's law universally applicable for all conducting elements ? If n...

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

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  10. A high tension (HT) supply of, say, 6 kV must have a very large intern...

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

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

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

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

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  15. (a) Given n resistores each of resistance R. how will you combine them...

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  16. (a) Given n resistores each of resistance R. how will you combine them...

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  17. Determine the equivalent resistance of networks shown in figure.

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  18. Determine the furrent drawn from a 12 V suly with internal resistacne ...

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

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  20. show a 2.0V potentiometer used for the determination of internal resis...

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