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B1 - 10-24

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symbol

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7°=

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Table 14.1

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electric ci

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Electric

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Electric

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14

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Electric Current

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and its Effects

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ou might have tried the game

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‘How steady is your hand?’

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suggested in Chapter 12 of

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Class VI. If not

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you may try it out now.

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Paheli and Boojho had also set up the

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game by connecting an electric circuit

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as suggested in Class VI. They had lots

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of fun trying it out with their families

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and friends. They enjoyed it so much

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that they decided to suggest it to a

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cousin of theirs who stayed in a

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different town. So

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Paheli made a neat

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drawing showing how the various

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electric components were to be

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connected (Fig. 14.1).

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Fig. 14.1 Setup to check how steady

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your hand is

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Can you draw this circuit

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conveniently? It made Boojho wonder if

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there was an easier way to represent

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these electric components.

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14.1 SYMBOLS OF ELECTRIC

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COMPONENTS

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Some common electric components can

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be represented by symbols. In Table 14.1

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some electric components and their

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symbols are shown. You may come

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across different symbols for these

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components in different books. However

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in this book

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we shall be using the

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symbols shown here.

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Look at the symbols carefully. In the

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symbol for the electric cell

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notice that

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there is a longer line and a shorter but

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thicker parallel line. Do you recall that

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an electric cell has a positive terminal

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and a negative terminal? In the symbol

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of the electric cell

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the longer line

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represents the positive terminal and the

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thicker

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shorter line represents the

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negative terminal.

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For a switch the ‘ON’ position and

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the ‘OFF’ position are represented by the

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symbols as shown. The wires used to

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connect the various components in a

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circuit are represented by lines.

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In Table 14.1

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a battery and its

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symbol are also shown. Do you know

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what a battery is? Look at the symbol of

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a battery. Can you make out what a

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battery could be? For some of the

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activities we may need more than one

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cell. So

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we connect two or more cells

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together as shown in Fig. 14.2. Notice

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Electri

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Switc

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Swi

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that +

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conn

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next

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