ELECTRICITY – VCA GD

  1. The instrument used to measure electric current is Ammeter
  2. What is the unit of measuring electrical resistance? Ohm
  3. What is the resistance of an ideal ammeter? 0
  4. What is Ohm’s formula ? V – IR
  5. What is the SI unit of resistance ?Ohm
  6.  Ampere is the unit of electric current
  7.  the unit of consumption of electricity is kilowatt hour
  8. the element with highest electrical conductivity is silver
  9. unit of electric power is watt
  10. The unit of power is Joule per second and Watt
  11. Current given by battery is called direct current
  12. The device used for converting A.C into D.C is called Rectifier
  13.  Use of capacitor is to collect charge
  14.  The semiconductor of electricity is Silicon and Germanium
  15.  Current given by battery is called direct current
  16.  What is produced by generator electricity
  17. Which of the following converts chemical energy into electrical and electrical energy. cell
  18. Electric current flows due to electrons
  19. An electric bulb is lit 220 volts, electric current is 0.50 ampere so what is the power of the Bulb 110W
  20. Which of the following is a scalar quantity? electric potential
  21. What electricity is produced by dynamo device dynamic
  22. What do we get from a generator electric energy
  23. What is the frequency of AC alternative current 50 Hertz
  24. Copper/silver is good conductors of electricity
  25.  which is ohm’s law? V=IR
  26. Electric current is the flow of electrons through a conductor
  27. Electrons flow from the negative terminal to the positive terminal.
  28. Electric current flows from the positive terminal to the negative terminal.
  29. The SI unit of electric charge is coulomb (C).
  30. 1 coulomb (C) of the charge contains 6×10 18 electrons
  31. The SI unit of current is called ampere (A).
  32. Electric Current is measured by an ammeter and galvanometer
  33. The SI unit of potential difference is volt (V).
  34. Potential difference is measured by a voltmeter and potentiometer.
  35. Ohms law is a relationship between the potential difference(volatage) across a conductor and the current flowing through it.
  36. V α I
  37. V=I R
  38. I= Q/T
  39. V= W/Q
  40. R is a constant called resistance measured in Ohm which is denoted by Ω
  41. Resistance is the property of a conductor to resist the flow of current through it.
  42. The resistance of a conductor increases with increase in length 
  43. The resistance of a conductor increases with decrease in area of wire
  44. R α L /A
  45.  ρ (rho) is a constant of proportionality called Resistivity.
  46. The SI unit of resistivity is ohm meter ( Ωm).
  47. Conductors like metals and alloys have low Resistivity.
  48. Insulators like rubber, glass etc. have high Resistivity
  49. In the series combination, equivalent resistance is the sum of the resistances of each resistor. RS = R1 + R2 + R3
  50. In resistors in parallel combination equivalent resistance is the reciprocal  sum of the resistances of each resistor.
  1. The unit of electrical energy is joule (J)
  2. Electric power is the rate at which electric current is used.
  3. Power = Work done P = V I
  4. Electric power is measured in Watt (W)

Current is measured in Ampere(A), Ammeter and galvanometer is used to measure current.

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