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If you were going to describe an electric circuit to someone, it is likely that you would want to draw it.   If you connected a bulb, battery and a switch, the circuit drawing might look like this:

 
       
    It takes time to draw such a circuit and because people might draw batteries and bulbs etc. in different ways it could be very confusing.  

It is easier if people use the same symbols in a circuit diagram.

Some symbols are: