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Figure classic-style potentiometer. A potentiometer can also be used to insert a variable resistance in a circuit, in which case it should really be referred to as a variable resistor, although most people will still call it a potentiometer.

potentiometer lesson – Electrical Circuits

Note the European substitution of K for a decimal point. Sliders are still found on some audio equipment.

Figure classic-style potentiometer Schematic symbols for a potentiometer and other associated components are shown in Figurewith American versions on the left and European versions on the right in each case.

Newer Post Older Post Home. The voltages shown assume that the resistive element has a linear taper and will vary slightly depending on wire resistance and other factors. It is often used to adjust sensitivity, balance, input, or output, especially in audio equipment and sensors such as motion detectors. This can be theveninn to power-up associated components for example, an audio amplifier. The principle of operation, and the number of terminals, are identical to the classic-style potentiometer.

Alternatively, a switch inside a potentiometer may be configured exercics that it is activated by pulling or pushing the shaft. A worm gear inside the package, beneath the screw head, engages with an interior gear wheel that rotates the wiper. A preset variable resistor is shown at the bottom, often referred to as a trimmer or Trimpot.


Trimmers always have linear taper. Sujet bac Ste In Figurethe crorigs one is about 3. Slider Potentiometer Trimmer Potentiometer Often referred to as Trimpots, this is actually a proprietary brand name of Bourns.

In Figurethe base of the shaft shown in black is attached to an arm shown in green that moves a wiper orange along a resistive element brown.

Sliders typically have solder tabs or PC pins. This system wastes far less power than if the potentiometer controlled the lighting or heating element directly as a rheostat. The third center terminal connects internally with a contact known as the wiper or rarely, the pickoffwhich touches the strip and can be moved from one end of it to the other by turning a shaft or screw, or by moving a slider.

The potentiometer adjusts the duty cycle of the power interruptions. They may be designed for screwdriver adjustment or may have a small knurled shaft, a thumb wheel, or a knob. Massive rheostats were once used for purposes such as dimming theatrical lighting, but solid-state components have taken their place in most high-wattage applications.

electronics components

Since less power is involved, the potentiometer can be small and cheap, and will not generate significant heat.

Potentiometers are widely used in lamp dimmers and on cooking dd see Figure The symbols for a potentiometer are at the top. It can be used to adjust the power supplied to a circuit, in which case it is properly known theoreke a rheostat, although this term is becoming obsolete.

Also known as a slide potentiometer. Exercice Comparateur a un Seuil. The outer pair connect with the opposite ends of an internal resistive element, such as a strip of conductive plastic, sometimes known as the track.

The smaller slider is designed for through-hole mounting on a circuit board. The latter is com parable with a trimmer where multiple turns of a screwdriver are used to rotate a worm gear that rotates a wiper between opposite ends of a circular track.


Exercices Theoreme de Thevenin. They are usually mounted directly on circuit boards to allow fine adjustment or trimming during manufacturing and testing to compensate for variations in other components.

Other multiple-turn thwvenin may use a screw thread that advances a wiper along a linear or circular track. Amplificateur logarithmique et exponentiel. In this mode, the potentiometer works as a cprrigs voltage divider. Bac ste normal. Trimmers may be singleturn or multi-turn, the latter theodeme a worm gear that engages with another gear to which the wiper is attached. Solder tabs underneath the slider are hidden in this photo.

A full-size, classic-style potentiometer is shown in Figure Switched Potentiometer In this variant, when the shaft is turned clockwise from an initial position that is fully counterclockwise. The correct symbols for a variable resistor or rheostat are shown at center, although a potentiometer symbol may often be used ezercices. They are not usually accessible by the end user of the equipment, and their setting may be sealed or fixed when the equipment is assembled. In Figurethe beige Spectrol trimmer is a single-turn design, whereas the blue trimmer is multi-turn.

Such multiple-turn potentiometers typically allow 3, 5, or 10 turns to move the wiper from end to end. A removable plastic finger-grip sold separately, in a variety of styles has been pushed into place. This uses a straight resistive strip and a wiper that is moved to and fro linearly by a tab or lug fitted with a plastic knob or finger-grip.