Main Points

Electric Current

  • The amount of electric charge flowing through a cross-section of a conductor in unit time is called electric current.
  • The closed path through which electric current flows is called electric circuit.
  • The work done in moving one unit charge from one point to another in a current-carrying circuit is called potential difference.
  • At constant temperature, the potential difference across two points in an electric circuit is directly proportional to the electric current flowing through it.
  • Resistance of a conductor depends on following factors: length of resistor, area of cross-section and material of resistor.
  • Connecting the resistors in series increases the resistance. On the other hand, connecting the resistors in parallel combination decreases the resistance.
  • When electric current passes through a conductor, then the conductor’s temperature increases because of heating effect of electric current.
  • The rate of consumption or dissipation of energy in an electric circuit is called electric power.

These main points are highly helpful for last minute preparation for examination. You can glance through them while going for examination. You can view them in the school bus, in car, in elevator, etc.