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Industry variable resistors

Industry variable resistors

Clear Search Input. Close Search Results. What are Variable Resistors used for? Jun 23, Simply put, a variable resistor is able to have its electrical resistance adjusted. They specifically work with voltage and currents that are a part of the circuit.

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Variable Resistors

VIDEO ON THE TOPIC: Variable Resistor & Potentiometer Working Tutorial

They are used for volume and gain controls as well as a variety of other applications. Preset variable resistors or potentiometers are also used in circuits that need a small adjustment to be made to set the circuit up after manufacture. For convenience variable resistors are made by having a fixed resistor with a variable tapping point.

As a result of this arrangement these devices are often called potentiometers or "pots" for short. This name is derived from the configuration used for many in the early days of electricity for measuring voltage. Here the potentiometer consisted of a length of resistance wire with a tapping point that could be moved along the wire - the same configuration as that used in these variable resistors. There are a variety of types of potentiometer that are available and there are a variety of different ways in which variable resistors or potentiometers can be classified.

The different types may be important in different applications and therefore it is sometime necessary to choose the correct types. One of the first ways in which variable resistors can be classified is whether they are preset or adjustable. In addition to the basic format of the variable resistor described above, the internal construction and in particular the material used for the resistive element is of importance as well.

Essentially variable resistors have a resistive track that is set down and the slider moves along making contact with a particular position on the fixed resistor. The material used for the track itself can govern aspects of the performance of the component including the power dissipation capability and noise generated.

Another variable in the type of potentiometers that are available is governed by the relationship between the resistance and the position along the track. Virtually all preset potentiometers are of the linear type, but not all adjustable ones are. Instead they may follow a logarithmic law. In this way they have a relatively small change over the first part of their travel, increasing the further along their travel they are set.

The reason for this is that the ear is not linear, and a logarithmic scale on the potentiometer gives a more equal increase in volume along the travel of the control as perceived by the ear. In some instances reverse logarithmic or anti-logarithmic scales can be obtained, although they are not nearly as common as the logarithmic potentiometers The way in which the resistance varies is normally marked on the potentiometer.

Descriptions such as 10k LOG or 5k LIN may be seen representing a 10 kilo-ohm potentiometer with a logarithmic value change or a 5 k linear version respectively. Apart from the electrical considerations, the mechanical ones are also important. The way in which a potentiometer or variable resistor moves can greatly affect the ergonomics of a piece of electronic equipment. One of the major mechanical considerations is the form of movement that creates the electrical changes in the variable resistor.

This versions of potentiometer uses a rotary motion to move the slider around a track that compromises most of a circle, with contacts at either end of the track in the area where part of the circle is missing.

Typical rotary potentiometer This form is widely used with knobs on a spindle for the actual control, and they are found in many applications from providing adjustments on test equipment through to being used for volume controls on domestic radios. These controls take up more front panel space, but are much easier to use under some circumstances. For example they are widely used for audio mixers and lighting desks. Audio mixer controls The advantage of sliders is that it is easier to control them quite precisely and compare the relative positions of a number of sliders.

It is also possible to control a number of sliders together. Summary Potentiometers are used in huge quantities in the manufacture of electronics equipment. These variable resistors or potentiometers provide a way of adjusting electronics circuits so that the correct outputs are obtained. Although their most obvious use must be for volume controls on radios and other electronics equipment used for audio, they also find many applications in other areas of electronics.

Types of variable resistor There are a variety of types of potentiometer that are available and there are a variety of different ways in which variable resistors or potentiometers can be classified.

These are generally used for functions such as volume or tone controls on radios. They also find many other uses where a value needs to be set by the user. They are used when a value needs to be set within a circuit, normally within the production set-up and test stage during its manufacture.

Although good design dictates that the fewest number of adjustable components should be used, it is sometimes necessary to make some adjustments to ensure that the circuit operates within its required limits.

Some presets consist of a single turn adjustment. This can be rather course when an accurate setting is required. To overcome this a variety of multi-turn preset pots are available. Generally they have about ten turns to set them from one end of their travel to the other.

However there are still choices to be made. Some can be adjusted from the side and others have a top adjustment. In this way all possibilities in equipment can be covered. The material used is a mixture of carbon and a filler material, the combination determining the resistivity of the carbon composition film of the potentiometer element. It is particularly applicable where any high temperatures may be experienced.

They also offer low noise levels than those offered by carbon composition types. As the name implies they a manufactured by winding a "coil" of resistance wire on a semi-circular former.

The surface of the wire must not be insulated so that the slider is able to make electrical contact with the fixed resistance element. In use it is often possible to feel the slider move from one turn of the wire to the next and this can be used to detect if a potentiometer is actually wire wound. These potentiometers are often used for high power or low resistance components. Supplier Directory For everything from distribution to test equipment, components and more, our directory covers it.

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Terry Bartelt is currently an Electromechanical Instructor at Fox Valley Technical College, with more than twenty five years teaching experience in the field. In addition, Mr. Bartelt's Electromechanical Technology Program was presented the Secretary of Education Award as one of the top ten community college programs in the country.

A potentiometer is a three- terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider. The measuring instrument called a potentiometer is essentially a voltage divider used for measuring electric potential voltage ; the component is an implementation of the same principle, hence its name. Potentiometers are commonly used to control electrical devices such as volume controls on audio equipment. Potentiometers operated by a mechanism can be used as position transducers , for example, in a joystick. Potentiometers are rarely used to directly control significant power more than a watt , since the power dissipated in the potentiometer would be comparable to the power in the controlled load.

Variable Resistor Market Expert Guide to Boost the Industry in Global Market Share

A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines , among other uses. High-power resistors that can dissipate many watts of electrical power as heat, may be used as part of motor controls, in power distribution systems, or as test loads for generators. Fixed resistors have resistances that only change slightly with temperature, time or operating voltage.

Variable Resistors / Potentiometer Types

Featuring a compact, fully sealed, and panel-sealed construction, the Vishay Sfernice potentiometer released today is a revolutionary concept in panel mounted potentiometers. Its unique design consists of a knob driving that incorporates a cermet or conductive plastic potentiometer. Only the mounting hardware and terminals are situated on the back side of the panel, which keeps the required clearance to a minimum and makes it ideal for small, low-profile, low-weight equipment. It is RoHS-compliant and lead Pb -free.

Ohmite has been the leading provider of resistive products for high current, high voltage, and high energy applications for over 90 years.

Keith is a freelance journalist whose whole life well, apart from the wife, the kids, the music and the mountain bike is computers. He's been writing about them computers, that is for over 18 years, in the meantime working as a teacher, lecturer, engineer, journalist and finally for the last 12 years freelance in the computing field. He dreams of new software and hardware, he realises that writing about computers makes little compared to making computers or writing the software for them, he is fully committed to passing his experience along to and making computer-life easier for his readers, yet still enjoys what he's doing. Which can't be all bad! Newnes Electronics Engineers Pocket Book. Keith Brindley. Elsevier , This book is packed with information and material which everyone involved in electronics will find indispensable. Now when you need to know a transistor's characteristics, or an integrated circuit's pinout details, simply look it up! The book is full of tables, symbols, formulae, conversions and illustrations.

What are Variable Resistors used for?

Resistance : 1 Ohm - Resistance : 2. The Online Industrial Exhibition. Variable resistors 3 companies 3 products.

Resistors are the most commonly used components in electronic circuits and devices. The main purpose of a resistor is to maintain specified values of voltage and current in an electronic circuit. The unit of resistance is Ohm.

Industrial Control Electronics. Terry L. This new edition continues to provide state-of-the-art coverage of the entire spectrum of industrial control, from servomechanisms to instrumentation. Material on the components, circuits, instruments, and control techniques used in today's industrial automated systems has been fully updated to include new information on thyristors and sensor interfacing and updated information on AC variable speed drives. Following an overview of an industrial control loop, readers may delve into individual sections that explore each element of the loop in detail. This logical format offers the flexibility needed to use the book effectively in a variety of courses, from electric motors to servomechanisms, programmable controllers, and more! Important Notice: Media content referenced within the product description or the product text may not be available in the ebook version. The Controller. Electric Motors.

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Don't have an AAC account? Create one now. Forgot your password? Click here. Latest Projects Education. Textbook Resistors. Home Textbook Vol. Because the relationship between voltage, current, and resistance in any circuit is so regular, we can reliably control any variable in a circuit simply by controlling the other two.


Electronic circuits are integral parts of nearly all the technological advances being made in our lives today. Television, radio, phones and computers immediately come to mind, but electronics are also used in automobiles, kitchen appliances, medical equipment and industrial controls. At the heart of these devices are active components, or components of the circuit that electronically control electron flow, like semiconductors. However, these devices could not function without much simpler, passive components that predate semiconductors by many decades. Unlike active components, passive components, such as resistors, capacitors and inductors, can't control the electron flow with electronic signals. As its name implies, a resistor is an electronic component that resists the flow of electric current in a circuit. In metals such as silver or copper , which have high electrical conductivity and therefore low resistivity, electrons are able to skip freely from one atom to the next, with little resistance.

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They are used for volume and gain controls as well as a variety of other applications. Preset variable resistors or potentiometers are also used in circuits that need a small adjustment to be made to set the circuit up after manufacture. For convenience variable resistors are made by having a fixed resistor with a variable tapping point.

The global wirewound variable resistors market is expected to witness significant growth over the forecast period owing to rise in demand in varied application areas. Escalated demand for electronic devices and equipment can be attributed as a key factor for surges in demand. Most consumer electronics and commercial electronic equipment have inbuilt wirewound resistors to avoid damage owing to transfer of excess current. These resistors provide damage protection to electronic gadgets by resisting fluctuations in the flow of extra electricity near its threshold voltage.

Resistors are components of electronic circuits which provide resistance to the electrical power or voltage, passing through the circuit or a specific part of the circuit. Variable resistors are such resistors whose value of electrical resistance provided can be varied.

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