Electric Switch

Key Notes :

Definition of an Electric Switch:

• An electric switch is a device used to open or close an electrical circuit.
• It controls the flow of electric current.

Purpose of an Electric Switch:

• It helps to turn on or off electrical appliances, such as lights, fans, or machines.

Types of Switches:

• Manual Switches: Operated by hand (e.g., household switches).

• Automatic Switches: Operate automatically based on conditions (e.g., sensors, thermostats).

Parts of an Electric Switch:

• Switch plate or body: The outer casing.
• Toggle or lever: The part moved to turn the circuit on or off.
• Contacts: Conductors inside the switch that make or break the connection.

How a Switch Works:

• When the switch is on, it completes the circuit, allowing electricity to flow.
• When the switch is off, it breaks the circuit, stopping the flow of electricity.

Symbols Used in Circuit Diagrams:

• A switch is represented by a simple open line (off) or a closed line (on) in circuit diagrams.

Examples of Electric Switches :

• Push-button switch: Used in doorbells.
• Two-way switch: Controls one device from two different locations.
• Rotary switch: Used in appliances like fans.

Importance of Switches:

• Safety: They prevent electrical hazards by controlling the flow of current.
• Convenience: Allow easy control of devices.

Real-Life Applications:

• Used in homes, schools, industries, and vehicles for various electrical devices.

Precautions While Using Switches:

• Always ensure hands are dry to avoid electric shocks.
• Do not tamper with faulty switches; get them repaired by a professional.

Let’s practice!