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Electricity


 



  1. Why is Tungsten metal selected for making filaments of incandescent lamp bulbs?
  2. Which will offer more resistance a 50W lamp or 25W lamp bulb and how many times?
  3. Why is much less heat generated in long electric than in filaments of electric bulb?
  4. What is superconductivity? Why is the research in superconductivity very important?
  5. What is the effect on resistivity of a pure metal with the increase in temperature?
  6. A torch bulb is rated at 3V and 600mA. Calculate it’s a) Power b) Resistance c) Energy consumed if it is lighted for 4 Hrs.
  7. Find the net power consumed by the two resistors R1 and R2 connected in series to a source of V volts.
  8. In a resistance R1 a current of 1A is passed. What is the amount of electrical energy dissipated in 1second?
  9. Two identical resistors each of resistance 10 ohm are connected 1) in series 2) in parallel, in line to a battery of 6volts. Calculate the ratio of power consumed in the combination of resistors in the two cases.
  10. A bulb is rated at 220V- 100W. What is its resistance? Five such bulbs burn for 4 hrs. What is the energy consumed? Calculate the cost if the rate is 50paise per unit?
  11. Express ohm’s law mathematically. Draw a circuit diagram to verify Ohm’s law. Present the relationship between the voltage applied across a conductor and the current flowing through it graphically.
  12. Two lamps rated 100W, 220V and 25W, 220V are connected in parallel to 220V supply. Calculate the total current through the circuit.
  13. A copper wire has a diameter of 0.5mm and resistivity of . How much of this wire is required to make a 10 ohm coil?How are ammeter and voltmeter connected in circuit? What are the ideal resistances for these components?How does the resistance of wire change when 1) Its length is doubled 2) Area is doubled?An electric kettle rated 1000W, 220V is used to bring water at 20 degrees to its boiling point. If the kettle is switched on for 10 minutes. Calculate:


  1. The resistance of the element of kettle
  2. Current flowing through the element

 


 


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