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Electric Components

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Electric Components - Lesson Summary

Circuit Diagram

A simplified conventional pictorial representation of an electrical circuit, using standard symbols for electric components, is called a circuit diagram. A circuit diagram is also known as an electrical diagram, wiring diagram, elementary diagram or electronic schematic.

Electrical Circuit

A closed path formed by the interconnection of electrical components through which electric current flows is called an electrical circuit. A simple electrical circuit consists of a battery, a light bulb and a switch connected using connecting wires. If current does not flow through a circuit, then it is said to be an open or an incomplete circuit. Its switch is in ‘off’ position. A circuit is said to be a closed or a complete circuit when current flows through it. Its switch is in ‘on’ position. A combination of two or more cells connected together is called a battery. Batteries are used in many devices, such as torch lights, mobile phones, calculators and even automobiles.

Symbols for Electrical Components

Different symbols are used to represent different components of electrical circuits, but the symbols used must be standardised. These symbols are easy to understand, remember and draw. 



Function of the Component



It allows current to flow from one part of the circuit to another.


When the switch is ON position, current will flow.

When the switch is in OFF position, current will not flow.


It supplies electric current. The positive terminal (+) of a cell is represented by a vertical long line, while the negative terminal (-) is shown as a parallel, shorter line.


The bulb glows if the switch is ON, and doesn’t glow if it is in OFF position.


It supplies electric current. A battery is a combination of two or more cells connected together.


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