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With the help of a diagram derive the fo...

With the help of a diagram derive the formula for the equivalent resistance of three resistances connected in parallels?

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PUNJAB BOARD PREVIOUS YEAR PAPERS-Electric Current, Resistance and E.M.F. -Exercise
  1. S.l. unit of electromotive force is volt. (True/False)

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  2. On what factor does the internal resistance of a cell depends?

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  3. With the help of a diagram derive the formula for the equivalent resis...

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  4. What is the internal resistance of a cell ? How it can be measured ?

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  5. What is Non-ohmic device ? Give one example.

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  6. What is a drift velocity ? Establish the relations between the drift v...

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  7. If drift velocity of electron as well as charge on electron is very sm...

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  8. Define internal resistance of a cell and find an expression for it.

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  9. Establish the relation between drift velocity of electrons and electri...

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  10. The number density of free electrons in a metal piece is a very large ...

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  11. Standard resistance coils are made up of which material why ?

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  12. What is the effect of the temperature on resistivity of metals

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  13. What is the effect of the temperature on resistivity of semiconductors...

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  14. Why connecting wires are made up of copper ?

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  15. What is resistance of a wire ? What are the factors on which resistanc...

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  16. What is the difference between emf of a cell and potential difference ...

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  17. What is resistivity of a wire ? What are the physical conditions on wh...

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  18. What are the factors on which the resistance of the conductor depends ...

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  19. Distinguish between emf and potential difference.

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  20. Explain colour code for carbon resistor .

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