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Rotary Potentiometers, Rheostats

A rotary potentiometer (or rotary pot, POT for short), is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider. The most popular type of rotary pot is the single-turn type, which can also be referred to as a potentiometer or a rheostat. These have two fixed contacts (P1 and P2) and one movable contact (P3) that can be turned, slid, or moved in some fashion across the length of the resistor\'s path. As the movable contact moves, it changes the voltage or resistance through the path between P1 and P2.

A rotary potentiometer (aka pot) can be used to measure current, voltage, or resistance. This makes them very useful in a variety of applications, including the control of motor speed, sound volume, and channel selection on audio equipment. In fact, a rotary pot is commonly used as a variable resistor in many consumer electronics such as computers, stereos, and televisions.

Rheostats, on the other hand, are two-terminal resistors with a movable contact. The main difference between a potentiometer and a rheostat is that a rheostat only has two terminals, while a potentiometer has three terminals. Due to this difference, a rheostat has a much lower resistance than a potentiometer, so it can only control much lower currents than a potentiometer.

Rheostats are mainly used to adjust the resistance in a circuit, such as for changing the speed of a motor. They can also be used to vary the power supply voltage to a certain device, such as a lightbulb. A rheostat can also be used to control the current to a device, such as a heater. The variety of applications for these components makes them very useful for electronics designers.

Rotary potentiometers and rheostats are widely used in a wide range of applications, including the control of motor speed, sound volume, channel selection on audio equipment, and as a variable resistor in consumer electronics. They offer a simple and cost-effective way to measure current, voltage, or resistance, making them very popular components in many different types of electronics.

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