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A Comprehensive Guide to Homeschooling

Drawing circuits


Symbols are used in drawing circuits instead of drawing pictures.


What is a symbol?

A symbol is a sign, letter or diagram that represents or stands for something.


What are the advantages of using symbols to draw circuits?


1) It saves time.

2) It is a good way of showing someone how a circuit should be connected up.


circuit symbols Symbols used in drawing circuits


A drawing of a simple circuit with a bulb, cell and the switch

simple-circuit-switch on

 A simple circuit with the switch ON


simple-circuit-switch off

A simple circuit with the switch OFF



A simple circuit with two bulbs with the switch ON


Look at each circuit diagram below. Which one do you think the bulb or bulbs will light.





Terminals of a cell


What is a terminal of a cell?

One of the ends of a cell to which the wires must be connected in a circuit is called a terminal of a cell.


How many terminals are there in a cell?



What are the two terminals in a cell?


1)     Negative terminal (-)

2)     Positive terminal (+)


How does the electricity flow between these two terminals of a cell?

Electricity flows from the negative terminal (-) to the positive terminal (+) of the cell.


If you have got only a cell and a bulb, will you be able to light the cell?


Why? Because, first we must join the two terminals of a cell by a material that conducts electricity.



Positive and Negative Terminals of a cell


What are the materials that conduct electricity?


1)     Wires

2)     Metal


What is the positive terminal on a circuit diagram?

The long vertical line


What is the negative terminal on a circuit diagram?

The short vertical line



Symbolic representation of Terminals of a cell