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Electrical reslstivities of some substan...

Electrical reslstivities of some substances, In ohm- meter, at `20^(@)` C are given as follows :

Which substance is preferred to be used for electrical transmission lines ? Give reason.

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Copper, economical/ low resistivity.
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OSWAAL PUBLICATION-ELECTRICITY-TOPIC-2 ( Short Answer Type Questions -II )
  1. a] Derive an expression for the equivalent resistance of three resisto...

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  2. Electrical reslstivities of some substances, In ohm- meter, at 20^(@) ...

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  3. Electrical reslstivities of some substances, In ohm- meter, at 20^(@) ...

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  4. Electrical reslstivities of some substances, In ohm- meter, at 20^(@) ...

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  5. In the above circuit, connect a nichrome wire of length ' between poin...

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  6. What is meant by saying that the potential difference between two poin...

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  7. Two devices of ratings 44W, 200V and 11W, 220V are connected in series...

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  8. Obtain an expression for equivalent resistance of two resistors connec...

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  9. Semi-conductors are certain type, of metals which allow only partial c...

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  10. A bulb is rated at 200V -40W. What is its resistantt ? 5 such bulbs ar...

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  11. Three resistors of 10 Omega, 15 Omega and 20 Omega are connected in s...

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  12. A circuit has a line of 5 A. How many lamps of rating 40W, 200V can si...

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  13. Calculate the resistance of a 1 Km long copper wire of area of cross s...

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  14. Study the following electric circuit and calculate the energy drawn fr...

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  15. Study the following electric circuit (i) Calculate the current flowing...

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  16. Calculate the amount of heat generated while transferring 90000 coulom...

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  17. Study the following electric circuit and calculate the potential diffe...

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  18. An electric heater is used on 220 V supply and takes a current of 5A. ...

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  19. Find the effective resistance between the points A and B in the networ...

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  20. Find the current drawn from the battery by the network of four resisto...

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