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Find the potential difference required t...

Find the potential difference required to pass a current of `0.2 A` in a wire of resistance `20 Omega`.

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According to Ohm's law, `V = IR = 0.2 xx 20 = 4 V`.
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PRADEEP-ELECTRICITY-(Additional)Very Short Answer
  1. How does the resistance of a wire depend on its length ?

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  2. How does the resistance of a metallic wire depend on its temperature ?

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  3. Two wires are of the same length, same radius, but one of them is of t...

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  5. An electric bulbs draws 1.2 A current at 6.0 V. Find the resistance of...

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  6. Which will have a higher resistivity : a conductor or an insulator ?

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  7. Two wires of same material and same length have radii r1 and r2 respec...

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  8. Name a substance whose resistance decrease with temperature.

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  9. Name a substance whose resistance almost remains unchanged by increase...

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  10. Distinguish between kilowatt and kilowatt hour.

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  11. Name two special characteristics of a heater coil.

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  13. Calculate the current through a lamp of 25 W operating at 200 V.

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  14. If r1,r2 and r3 are three resistors connected in series in a circuit a...

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  15. Which combination of resistors is used to decrease current in a circui...

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  16. What is the pd across each resistor in a series circuit ?

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  17. The power rating of an appliance is 100 W-250 V. What does it signify ...

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  18. Why is much less heat generated in long electric cables than in the fi...

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  19. Is Joule heating always desirable ?

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  20. Why are the coils of electric toasters made of an alloy than a pure me...

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