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Rotary Potentiometers, Rheostats

PTR902-2015K-A103 Application Field and Working Principle

A potentiometer, or rotary potentiometer, is a mechanical or electronic device used to measure an electrical value, typically by adjusting a variable resistor. They come in many varieties, ranging from rotary, disk, linear, and mini potentiometers to those used in combination with digital display. Potentiometers are used in a wide range of applications, including adjusting audio volume and controlling power levels in electronic circuits.

Rheostats, also known as variable resistors, are similar to potentiometers but differ in their basic function. They are used primarily for adjusting voltage or current levels in a circuit and are usually constructed using coils of wire wound around an armature. Rheostats are most commonly found in automobile audio systems, in voltage regulators, and in potentiometer-based DC motors.

The PTR902-2015K-A103 potentiometers and rheostats series are designed for use in HVAC, automotive, medical and other industrial control applications. These are industrial grade, linear-taper, single-turn components that feature a 10,000 rotations life cycle rating, a temperature range of -30°C to +85°C, and a rotational torque range of 0.2 to 2.0 inch-ounces.

The PTR902-2015K-A103 series utilizes a 90° rotational angle with a resolution of 1-degree, and is a surface mount device with lead installations based on a 3-pin configuration. Its rated voltage is 10V AC/DC and a current rating of 0.5A to 1.0A. It\'s also UL-recognized, and CSA certified.

The Potentiometer and Rheostat\'s working principle is based on the principle of resistive divider. When the rotary body of the potentiometer or rheostat is turned, it divides the electrical resistance across the device into two equal parts. As the rotary body is turned, the electrical resistance between the two points of the divider is changed. This change in resistance is then used to control the flow of current in a circuit.

The potentiometer and rheostat thus act as variable resistors, providing a variable current or voltage to control the flow of electrical current in a circuit. The potentiometers and rheostats are used in many applications, such as audio systems, automotive electronics, electronic circuits, and medical devices.

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