Symbols are used in drawing circuits instead of drawing pictures.
A symbol is a sign, letter or diagram that represents or stands for something.
1) It saves time.
2) It is a good way of showing someone how a circuit should be connected up.
A drawing of a simple circuit with a bulb, cell and the switch
A simple circuit with the switch ON
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.
One of the ends of a cell to which the wires must be connected in a circuit is called a terminal of a cell.
1) Negative terminal (-)
2) Positive terminal (+)
Electricity flows from the negative terminal (-) to the positive terminal (+) of 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
The long vertical line
The short vertical line
Symbolic representation of Terminals of a cellFebruary 5, 2013