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Tuesday, 30 June 2015

ELECTRICITY QUESTIONS

ELECTRICITY

QUESTIONS
  1. What does an electric circuit means?
  2. Define the unit of current?
  3. Calculate the number of electrons constituting one coulomb of charge.
  4. Name a device that helps to maintain a potential difference across a conductor.
  5. What is meant by saying that the potential difference between two points is 1V?
  6. How much energy is given to each coulomb of charge passing through a 6 V battery?
  7. On what factors does the resistance of a conductor depend?
  8. Will current flow more easily through a thick wire of a thin wire of the same material, when connected to the same source? Why?
  9. Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value. What change will occur in the current through it?
  10. Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal?
  11. Which material is the best conductor?
  12. Draw the schematic diagram of a circuit consisting of a battery of three cell of 2V each, a 5 Ώ resistor, and a plug key, all connected in series.
  13. Judge the equivalent resistor when the following are connected in parallel: (a) 1 Ώ and 106 Ώ (b) 1Ώ and 103Ώ, and 106 Ώ.
  14. Why does the cord of an electric heater not glow while the heating element does?
  15. Why is the tungsten used almost exclusively for filament of electric lamps?
  16. Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal?
  17. Why is the series arrangement not used for domestic circuits?
  18. How does the resistance of a wire vary with its area of cross-section?
  19. Why copper and aluminum wires are usually employed for electricity transmission?
  20. What are the functions of earth wire? Why is it necessary to earth metallic appliances?
  21. When does an electric short circuit occur?
  22. Explain the underlying principle and working of a generator by drawing a labeled diagram. What is the function of brushes?
  23. Two circuit coils A and B are placed closed to each other. If the current in the coil A is changed, will some current be induced in the coil B? Give reason.
  24. A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is (i) pushed into the coil, (ii) withdraw from inside the coil,



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