Adjustable Resistors

Adjustable resistors, also known as potentiometers, allow a degree of control over the resistance within a circuit. This gives them an advantage over other types of fixed resistor, depending on your needs.
They are composed of a fixed resistive element, and a slider that is able to pass along the element. This is what changes the resistance of the circuit, and it is usually controlled externally.

What are adjustable resistors used for?
Adjustable resistors are most commonly used for volume control in TV and radio. They can also be used as part of a light dimmer, to indirectly affect the level of light.

Types of adjustable resistor
Adjustable resistors largely vary based on material:

  • Wirewound adjustable resistors use a coil of resistance wire, and offer the highest performance.
  • Cermet adjustable resistors are composed of ceramic and metal. They can withstand high temperatures, and are often used in trimmer resistors.
  • Carbon composition adjustable resistors are some of the most common types used, as they are a good all-purpose resistor.
  • Conductive plastic adjustable resistors use conductive plastic ink, and have a low noise output.

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Description Price Resistance Tolerance Power Rating Temperature Coefficient Termination Style Package/Case Technology Mounting Style Case Style Series Dimensions Diameter Length Maximum Operating Temperature
RS Stock No. 892-4926
Mfr. Part No.D50K20KE
BrandOhmite
SGD21.61
Each
units
20kΩ ±10% 50W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D50 14.3 x 101.6mm 14.3mm 101.6mm +350°C
RS Stock No. 788-7778
Mfr. Part No.RSSD30250AR470MB06
BrandVishay
SGD111.32
Each
units
470mΩ 20% 280W - Radial BA25 - Bolt On Vitreous Enamel RSSD 32 (Dia.) x 250mm 32mm 250mm +450°C
RS Stock No. 893-0930
Mfr. Part No.E300KR20E
BrandOhmite
SGD58.518
Each (In a Pack of 5)
units
200mΩ ±10% 300W ±400ppm/°C - - - Bolt On, Bracket Vitreous Enamel E300 28.58 x 215.9mm 28.58mm 215.9mm +400°C
RS Stock No. 788-7848
Mfr. Part No.RA20117A100R0KB10
BrandVishay
SGD121.59
Each
units
100Ω ±10% 50W - Screw Tubular Wire Wound - - RA20117 - - - +350°C
RS Stock No. 893-5115
Mfr. Part No.D50K50R
BrandOhmite
SGD21.433
Each (In a Pack of 25)
units
50Ω ±10% 50W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D50 14.3 x 101.6mm 14.3mm 101.6mm +350°C
RS Stock No. 788-7725
Mfr. Part No.RSSD10X50A1R00KS06
BrandVishay
SGD24.96
Each
units
10% 25W - Radial BA25 Wire Wound Flange Mount Vitreous Enamel RSSD 11.5 (Dia.) x 50mm 11.5mm 50mm +450°C
RS Stock No. 161-7580
Mfr. Part No.ZC6/10-FT
BrandCressall
SGD213.00
Each
units
3.96Ω ±10% - - Screw - Wire Wound Bolt On - ZC - - 555mm +50°C
RS Stock No. 892-4793
Mfr. Part No.D175K100E
BrandOhmite
SGD39.45
Each
units
100Ω ±10% 175W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D175 28.6 x 215.9mm 28.6mm 215.9mm +350°C
RS Stock No. 892-4743
Mfr. Part No.D100K3R0E
BrandOhmite
SGD36.97
Each
units
±10% 100W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D100 19.1 x 165.1mm 19.1mm 165.1mm +350°C
RS Stock No. 892-4869
Mfr. Part No.D25K10KE
BrandOhmite
SGD18.56
Each
units
10kΩ ±10% 25W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D25 14.3 x 50.8mm 14.3mm 50.8mm +350°C
RS Stock No. 892-8410
Mfr. Part No.D100K5K0E
BrandOhmite
SGD33.22
Each
units
5kΩ ±10% 100W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D100 19.1 x 165.1mm 19.1mm 165.1mm +350°C
RS Stock No. 892-4862
Mfr. Part No.D25K10RE
BrandOhmite
SGD16.99
Each
units
10Ω ±10% 25W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D25 14.3 x 50.8mm 14.3mm 50.8mm +350°C
RS Stock No. 892-4755
Mfr. Part No.D100K500E
BrandOhmite
SGD33.22
Each
units
500Ω ±10% 100W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D100 19.1 x 165.1mm 19.1mm 165.1mm +350°C
RS Stock No. 161-7576
Mfr. Part No.ZC6/5-FT
BrandCressall
SGD252.89
Each
units
980mΩ ±10% - - Screw - Wire Wound Bolt On - ZC - - 555mm +50°C
RS Stock No. 161-7573
Mfr. Part No.ZC3/10-FT
BrandCressall
SGD202.97
Each
units
1.98Ω ±10% - - Screw - Wire Wound Bolt On - ZC - - 330mm +50°C
RS Stock No. 892-4816
Mfr. Part No.D225K10RE
BrandOhmite
SGD49.39
Each
units
10Ω ±10% 225W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D225 28.6 x 266.7mm 28.6mm 266.7mm +350°C
RS Stock No. 144-5506
Mfr. Part No.D25K300E
SGD20.79
Each
units
300Ω ±10% 25W ±260ppm/°C Solder - Wire Wound Bolt On Vitreous Enamel 210 14.3 (Dia.) x 50.8mm 14.3mm 50.8mm +350°C
RS Stock No. 892-4834
Mfr. Part No.D225K2K5E
BrandOhmite
SGD41.64
Each
units
2.5kΩ ±10% 225W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D225 28.6 x 266.7mm 28.6mm 266.7mm +350°C
RS Stock No. 144-5509
Mfr. Part No.D50K75RE
SGD27.02
Each
units
75Ω ±10% 50W ±260ppm/°C Solder - Wire Wound Bolt On Vitreous Enamel 210 14.3 (Dia.) x 101.6mm 14.3mm 101.6mm +350°C
RS Stock No. 893-5421
Mfr. Part No.D12K75RE
BrandOhmite
SGD16.94
Each
units
75Ω ±10% 12W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D12 7.94 x 44.4mm 7.94mm 44.4mm +350°C
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