CIRCUIT DIAGRAM – A REPRESENTATION OF ELECTRIC CIRCUIT
We know that an electric circuit, as shown in Fig. 12.1, comprises a cell (or a battery), a plug key, electrical component(s), and connecting wires. It is often convenient to draw a schematic diagram, in which different components of the circuit are represented by the symbols conveniently used.
Figure 12.1: A schematic diagram of an electric circuit comprising – cell, electric bulb, ammeter and plug key
Conventional symbols used to represent some of the most commonly used electrical components are given in Table 12.1.
Sl. No. |
Components |
Symbols |
|
|
|
1 |
an electric cell | |
2 |
A battery or a combination of cells |
|
3 |
Plug key or switch (open) |
|
4 |
Plug key or switch (closed) |
|
5 |
A wire joint |
|
6 |
Wires crossing without joining |
|
7 |
Electric bulb |
|
8 |
A resistor of resistance R |
|
9 |
Variable resistance or rheostat |
|
10 |
Ammeter |
|
11 |
Voltmeter |
Table 12.1: Symbols of some commonly used components in circuit diagrams
Source: This topic is taken from NCERT TEXTBOOK