Circuit diagram

  • When an electric circuit is represented in a convection pictorial form using symbols for Electronic components, then it is called a circuit diagram.
  • It is also known as wiring diagram, elementary diagram, electrical diagram or electronic schematic.

class 7 electriccurrents

 

Electric circuit

  • An electric circuit is a closed path created by the connection of different electronic components by which current flows.
  • A battery should be connected if a circuit needs more power.

Open Circuit

  • When through a circuit current does not flow then it is called open circuit.
  • Its switch has an off position.

Closed circuit

  • When through a circuit current flows then it is called open circuit.
  • Its switch has an on position.

class 7 electriccurrents

The heating effect of electric current

  • When through the filament of the bulb, an electric current flows then heat gets generated and bulb becomes hot.
  • This property is called a heating effect of an electric current.

Heating elements

  • Heating elements have wire coils which produce heat.
  • The function of the appliance decides the type of heating element.

The magnetic effect of electric current

  • The bar acts like a magnet when around an iron bar electric current runs through a wire.
  • This particular magnet is named as an electromagnet.
  • Hans Christian Oersted discovered this effect.
  • Two pieces of insulated copper, a battery, a bulb, a nail, and paper clips of iron are required to make an electromagnet

Application of an electromagnet

  • Toys
  • Medicines
  • Electric bell
  • Iron industries

class 7 electriccurrents

Recap

  • When an electric circuit is represented in a convection pictorial form using symbols for Electronic components, then it is called a circuit diagram.
  • A battery should be connected if a circuit needs more power.
  • When through a circuit current does not flow then it is called open circuit.
  • When through a circuit current flows then it is called open circuit.
  • The bar acts like a magnet when around an iron bar electric current runs through a wire.