What is the symbol of variable resistance or rheostat?

The symbol of variable resistance or rheostat is:

A rheostat symbol represents a variable resistor in an electrical circuit. Rheostats are essential components in circuits designed to control the flow of electric current by adjusting resistance. This flexibility makes them a vital tool in various applications, such as dimming lights, adjusting motor speeds, and tuning circuits.

The rheostat symbol is typically depicted in circuit diagrams as a rectangle or zig-zag line with an arrow passing through it at an angle. This arrow signifies the variable nature of the resistor, indicating that the resistance can be adjusted as needed.

Here’s a visual representation of the rheostat symbol for better understanding:

• Standard Rheostat Symbol: A rectangular box with an angled arrow crossing it diagonally.
• Alternate Representation: A zig-zag line with an arrow through it to signify adjustability.

Rheostats work by altering their resistance to control current flow in a circuit. This functionality is widely used in applications where precise current regulation is crucial, making the rheostat symbol a fundamental element in electronic schematics.

Understanding the rheostat symbol and its role in controlling resistance helps in grasping the fundamentals of electrical engineering and circuit design.