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Rotary Potentiometers and Rheostats are electronic components used in various applications where a variable resistance is needed. They both work by altering the resistance of a circuit, but in slightly different ways. This article will look at the application field and working principle of such components.

Rotary Potentiometers

Rotary Potentiometers are components used to measure voltage on a circuit. A typical rotary potentiometer has three connections: one to the circuit’s power source, one to the circuit’s ground and one to a wiper that can slide along a resistance strip. Slewing the wiper causes the resistance on the circuit to be varied. This type of device is used extensively in audio circuits. For example, in a volume knob on a stereo.

Rheostats

Rheostats are components used in applications where variable resistance is needed. Unlike potentiometers, they do not have a wiper, instead they have two connections which, when moved, vary the resistance of the circuit. Rheostats are typically used in voltage regulator circuits and light dimmers. They are also used to control the voltage and current in electric motors, generators, and other power systems.

Working Principle

The working principle behind both rotary potentiometers and rheostats is the same. The resistance in the circuit is varied by changing the position of the wiper and/or connections. As the wiper is adjusted, the resistance in the circuit is varied, which in turn alters the amount of voltage and/or current flowing into the circuit. This means that the amount of power in the circuit can be easily regulated.

Application Field

Rotary potentiometers and rheostats are used in a wide variety of applications due to their ability to vary resistance in a circuit. They are commonly used in audio and lighting systems, as well as in industrial and automotive electronics. Due to their ability to regulate voltage and current in a circuit, they are also used in power supplies, electric motors and other high-powered systems. In addition, they are used in many medical applications, such as heart monitors and EEG machines.

Rotary potentiometers and rheostats are both electronic components that work by varying the resistance of a circuit. They are used in a variety of applications where variable resistance is required, such as audio, lighting, medical, automotive, and industrial electronics. By understanding the application field and working principle of these two components, engineers can select the right component for their needs.

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