Electricity is an important form of energy used in many devices around us. From lighting bulbs to running electronic gadgets, electricity plays a vital role in our daily lives.
To understand how electricity works, it is important to learn about electric cells, circuits, switches, conductors, and insulators.
Electric Cell
An electric cell is a device that provides electricity to different electrical appliances. For example, torches use electric cells to light their bulbs.
Similarly, many small devices such as alarm clocks, wristwatches, radios, and cameras also operate using electric cells.
Every electric cell has two terminals:
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Positive terminal
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Negative terminal
An electric cell produces electricity from chemicals stored inside it. However, when these chemicals get used up, the cell stops producing electricity.
Electric Circuit
When electrical components such as cells, wires, and bulbs are connected together, they form an electric circuit.
Electric current flows through the circuit only when the path is complete. As a result, a bulb lights up when current passes through it.
In an electric circuit, the direction of electric current is considered to flow from the positive terminal of the cell to the negative terminal.
Fused Electric Bulb
Sometimes a bulb does not glow even when it is connected to a cell. In such cases, the bulb may be fused.
A bulb usually fuses when its filament breaks. The filament is a thin wire inside the bulb that allows electric current to pass through it.
When the filament breaks, the path of the current also breaks. Consequently, no current flows through the bulb, and it stops glowing.
Switch in an Electric Circuit
A switch is a simple device that controls the flow of electricity in a circuit.
When a switch is turned on, it completes the circuit and allows current to flow. On the other hand, turning the switch off breaks the circuit and stops the flow of electricity.
Therefore, switches help control electrical devices safely and conveniently.
Conductors of Electricity
Materials that allow electric current to pass through them easily are called conductors.
Examples of conductors include:
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Copper
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Aluminium
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Iron
These materials are commonly used to make electrical wires and other electrical components.
Insulators of Electricity
Some materials do not allow electric current to pass through them. These materials are known as insulators.
Examples of insulators include:
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Rubber
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Plastic
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Wood
Insulators are very important for safety. For instance, electrical wires are usually covered with rubber or plastic so that people do not receive electric shocks.
Electrical Safety and Materials
Many electrical components use both conductors and insulators. For example, switches, plugs, and sockets contain conducting parts that allow electricity to flow.
However, the outer covering of these devices is made from insulating materials such as plastic. This prevents accidental electric shocks when people touch them.
Conclusion
Electricity is an essential source of energy that powers many devices used in everyday life. Understanding electric cells, circuits, switches, conductors, and insulators helps us learn how electrical systems work.
Moreover, this knowledge also helps people use electricity safely and efficiently.
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