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A high tension (HT) supply of, say 6 Kv ...

A high tension (HT) supply of, say 6 Kv must have a very large internal resistance. Why?

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A high tension supply must have a large internal resistance otherwise, if accidently the circuit is shorted, the current drawn will excced safety limit and will cause damage to circuit.
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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 ?

(A): A high tension supply must have very large internal resistance (R): A short circuited cell gives very high current, that may exceed safety limits of cell.

(A): A voltage supply from which one needs high currents must have very low internal resistance. (R): The maximum current drawn from a cell is e/r only.

(a) Six lead-acid type of secondary cells each of emf 2.0 V and internal resistacne 0.015Omega are joined in series to provide a supply to a resistance of 8.5 Omega. What are the current drawn from the suply and its terminal voltage ? (b) A secondary cell after long use has an emf of 1.9 V and a large internal resistance of 380 Omega. What maximum current can be drawn from the cell? Could the cell drive tghe starting motor of a car ?

Figure shows a potentiometer with a cell of 2.0 V and internal resistance 0.40 Omega maintain a potential drop across the resistor wire AB. A standard cell which maintains a constant emf of 1.02 V (for very moderate currents upto a few mA) gives a balances point at 63.3 cm length of the wire. To ensure very low currents drawn from the standard cell, a very high resistance of 600 Omega is put is series with it, which is shortedd close to the balance point. The standard cell is then replaced by a cell of unknown emf epsilon and the balance point found similarly, turns out to be at 82.3 cm length of the wire. Is the balance point affected by the internal resistance of the driver cell.

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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