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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

 

circuit-with-two-bulbs

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.

 

circuit-diagram

 

 

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?

Two

 

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?

No.

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

 

battery-terminals

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

 

terminals

Symbolic representation of Terminals of a cell