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• Two pencil like objects in a torch is called an electric cell
• Electric cells are used in wrist watches, calculators, transistor radios, in cameras, etc
• The positive and negative signs on an electric cell is positive and negative electric terminal respectively.
• Electric cell produces energy with the help of chemical stored in it. Chemical energy is converted into electric energy
• Simple electric circuit with bulb
• Get a bulb, few wires, and an electric cell
• Take two wires and fix them on bulb
• Fix two wires on electric cell
• Connect each wire of bulb to different terminals of cell
• Bulb lights up, simple electric cell is ready
• Electric switch – Device needed to start and stop the flow of current in an electric circuit is called as electric switch. If the bulb doesn’t glows, then switch is OFF / OPEN. If the bulb glows, then switch is ON/ CLOSED . When switch is in OFF or OPEN condition it is said to be open circuit. If the switch is in ON / CLOSED condition then it is said to be in closed circuit.
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• Conductors and insulators –
  

  Conductors	Insulator
  Allows the current to pass through it	Donot allow the current to pass through it
  Electric bulb in a circuit glows	Electric bulb in a circuit doesnt grows
  Metals are conductors	Non metals are insulators
  E.g copper, aluminum, gold, and silver	E.g. wood, plastic, rubber, etc