Potentiometer and Rheostat Differences

We sometimes receive enquiries for potentiometers and rheostats that indicate there is some confusion between terminology surrounding potentiometers and rheostats. fundamentally there is little difference between the two. They both have the following characteristics:

Allow for variable and continuous adjustment of a specified resistance value
Allow for adjustment via a rotary shaft
Are mounted (generally) via a bush mounting system
Have similar temperature derating curves
Both offer solder or quick connect termination options
Both have a specified angle of rotation
Both have a wiper in totational contact with a resistance element

As we can see from the photographs below, there are physical similarities between the two (potentiometers and […]

September 11th, 2015|potentiometer, Rheostat, wirewound potentiometer|

Wirewound Potentiometer Applications

Wirewound Potentiometer – Power Rated Variable Resistor
The requirement for variable resistance in electrical and electronic circuits has existed ever since electrical engineering has been around. From the early days of valve based radio and television, there has been a requirement for a variable resistance that has a power rating of several watts.

The AW 3 watt wirewound potentiometer manufactured by Australian Resistors has been the ‘standard’ for wirewound potentiometers in Australia for over 50 years. It has also been extensively exported around the world due to its reputation for long term reliability and economic pricing. There is a strong distributor network for […]

Custom Power Resistor Manufacturing

Being Australia’s largest manufacturer of wire wound and power resistors, Australian Resistors has the capacity to manufacture custom designed resistor assemblies to meet customer specifications. We generally work with clients, both at an engineering and purchasing level, to determine the resistor specification required for their project. This can take into account parameters including:

Resistor wattage
Resistor power rating
Mounting requirements. This could include vertical mounting or horizontal mounting or indeed a custom mounting requirement to enable ease of mounting the resistor assembly within the clients’ equipment.
Resistor termination. This could include solder terminals, quick connect terminals, ferrule mounting or a wide range of other options. […]

Slider Resistors In Laboratory Calibration

The use of slider resistors or ‘laboratory resistors” have been employed for over 50 years as a means of calibrating electrical and electronic devices. The can be configured in resistance bridge arrangements and provided the correct ratings are available, in high voltage test circuitry.

The single tube slider resistor range is often used in test laboratories where electrical and electronic components are required to be tested to ensure they meet Australian Standards. Examples of these are street lighting systems, traffic lights and transformers. Slider resistors provide for precision adjustment of resistance allowing accurate setup of voltage and current in test circuitry.


June 19th, 2015|Laboratory Resistor, Power Resistor, Slider Resistor|

100 Watt Power Resistor

There is a wide variety of applications calling for a 100 watt power resistor. By looking through the power resistor products page it is apparent that there are several options when selecting a power resistor that meets this rating. Here we take a look at all the available options:

Power Wire Wound Resistor Assembly. The HA tubular power resistor is a highly reliable and ‘tried and tested’ resistor assembly that has been manufactured for over 40 years. It is robust, moisture resistant, resists chipping and can withstand temperatures over 1000 C.  It is available in an adjustable resistance and has many mounting […]

Wire Wound Potentiometer – Audio Amplifier Application

Potentiometers have been used for over 70 years for applications where varying a resistance is necessary as part of an electronic circuit. Typically carbon based tracks were employed for many years but when power ratings of several watts are required then the use of a wire wound element is preferable as greater power dissipation is possible.

A local high specification audio amplifier manufacturer needed a high reliability wire wound potentiometer to act as  a volume control in one of their amplifier designs. The potentiometer required a 2.2 watt rating and the AW potentiometer was deemed to be a suitable candidate as it […]

April 20th, 2015|Resistor Applications, wire wound potentiometer|

Precision Wire Wound Resistors

Wire Wound Resistors Requiring High Power And Precision
Certain applications in electrical or electronic design call for a combination of:

High power rating
Tight tolerance on the resistance winding
Wire wound construction

Obtaining all three of these requirements in a resistor calls for a unique type of resistor construction. The ASW series precision wire wound resistors have been used extensively for applications in industries ranging from power conversion, U.P.S. manufacture, lighting control, motor drive circuits (both a.c. and d.c.) and transportation.

With power ratings available in 1.5 watts, 3 watts, 6.5 watts, 8 watts and 11 watts these power resistors have an available tolerance as low […]

500 Watt Power Resistor – Selecting Wire Wound Resistors

16 February 2015. Continuing on with out wire wound resistor selection series, this week we take the example of a high power resistor – namely a 500 watt power resistor. In this example our application calls for a 500 watt rated resistor that has a 5 percent tolerance and 470 ohm adjustable resistance.

A 500 watt rated resistor, by its very power rating, calls for a rugged, highly reliable method of construction, with the ability to dissipate significant amounts of heat from the body of the resistor. From our wire wound resistor product selection guide, we can see that the Y Series […]

Wire Wound Resistor Selection

Selecting the correct wire wound resistor for your application is critical in insuring excellent long term reliability for your circuitry and equipment in which the power resistor is being used. Once you have determined the appropriate power rating for your application, by, for example, using ohms law, you can then select the type of resistor based on these parameters:

Physical size
Required method of mounting the resistor
Electrical pulse handling capability
Requirement of the resistor to be adjustable or fixed in value
Required tolerance of resistance
Mechanical construction of the resistor
Non Inductive winding

As you will see from the products page, we can offer a resistor that […]

January 13th, 2015|Power Resistor, Resistor Applications, Wire Wound Resistors|

Wire Wound Resistor Quality – Not All Resistors Are Equal

The market and applications for wire wound resistors, both globally and in Australia is very diverse. The majority of our range of wire wound resistors are manufactured for industry. Companies manufacturing electronic and electrical products generally have some, or all of the following requirements when specifying and sourcing appropriate wire wound resistors and power resistors for their products:

Reliability. More often than not the application for a wire wound resistor calls for a significant power handling capability in comparison with the rest of the appliances circuity. As power capacity of a component generally entails heat dissipation it is critical that the […]

November 4th, 2014|resistor manufacturer, resistor quality, Wire Wound Resistors|