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Class Tenth Physics Current electricity



  1. Name one physical condition on which the resistivity of a metal depend on?
  2. If a wire of length ‘l” is stretched  three times its original length what happens to its new resistance and resistivity?
  3. Name the physical quantity which carries the unit J/C ?
  4. what causes the current to flow in a conductor/
  5. Relate 1 joule and 1 volt.
  6. why is ammeter cannot be connected in parallel to a given resistor in a circuit?
  7. What is conductance ?  what happens to the conductivity of a conductor when its temperature is increased?
  8. When length of a wire is doubled what happens to its resistance?
  9. what is the commercial unit of electrical energy?
  10. Name the material used for electric heater wires?
  11. Light from bathroom bulb gets dimmer for a moment when geyser is switched on. Why?
  12. Name the material the resistance coils (standard) are made of?
  13. A wire of  resistance 2 ohms is bent to form a circle. What is the resistance between two diametrically opposite points?
  14. A small heating element connected to a 10 V d.c supply draws a current of 5 A. How much electric power is supplied to the heater?
  15. How many electrons are in 1C of charge?
  16. What is electrical potential energy?
  17. How much current will an electric iron draw from 200v line, if the resistance of the electric iron coil is 500 ohms?
  18. When a constant current is applied for a time of t seconds, how can you increase the heat produced to 4 times?
  19. From the graph which of the two resistors has higher resistance justify?

 20 if the potential  V  of given conductor of resistance R s doubled what happens  to its new  resistance R ? Draw a graph b/w   V and R


    to show the variation of it.


21. An electric iron has a rating of 750 W , 220 V. Calculate the  a) current passing through it.  b) its resistance in use


 


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