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. 788-7659
Mfr. Part No.RSSD25168A2R20KB06
BrandVishay
MYR220.52
Each
units
2.2 Ω ±10% 200W - Radial BA25 - Bolt On Vitreous Enamel RSSD 27 (Dia.) x 168mm 27mm 168mm +450°C
RS Stock No. 892-4796
Mfr. Part No.D12K5K0E
BrandOhmite
MYR57.42
Each
units
5 kΩ ±10% 12W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D12 7.94 x 44.4mm 7.94mm 44.4mm +350°C
RS Stock No. 892-4816
Mfr. Part No.D225K10RE
BrandOhmite
MYR172.19
Each
units
10 Ω ±10% 225W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D225 28.6 x 266.7mm 28.6mm 266.7mm +350°C
RS Stock No. 892-8353
Mfr. Part No.D25K250E
BrandOhmite
MYR61.31
Each
units
250 Ω ±10% 25W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D25 14.3 x 50.8mm 14.3mm 50.8mm +350°C
RS Stock No. 136-3281
Mfr. Part No.D50K4R0E
MYR86.59
Each
units
4 Ω ±10% 50W ±260ppm/°C Radial - Wire Wound Bolt On Vitreous Enamel 210 14.3 (Dia.) x 101.6mm 14.3mm 101.6mm +350°C
RS Stock No. 788-7747
Mfr. Part No.RSSD20117A22R0JB15
BrandVishay
MYR140.98
Each
units
22 Ω 5% 100W - Radial BA25 Wire Wound Flange Mount Vitreous Enamel RSSD 22 (Dia.) x 117mm 22mm 117mm +450°C
RS Stock No. 892-4888
Mfr. Part No.D25K25KE
BrandOhmite
MYR59.43
Each
units
25 kΩ ±10% 25W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D25 14.3 x 50.8mm 14.3mm 50.8mm +350°C
RS Stock No. 892-8192
Mfr. Part No.D50K100E
BrandOhmite
MYR79.51
Each
units
100 Ω ±10% 50W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D50 14.3 x 101.6mm 14.3mm 101.6mm +350°C
RS Stock No. 788-7728
Mfr. Part No.RSSD10X50A22R0JS06
BrandVishay
MYR99.59
Each
units
22 Ω 5% 25W - Radial BA25 Wire Wound Flange Mount Vitreous Enamel RSSD 11.5 (Dia.) x 50mm 11.5mm 50mm +450°C
RS Stock No. 788-7643
Mfr. Part No.RSSD20117A2R20KB15
BrandVishay
MYR131.74
Each
units
2.2 Ω ±10% 100W - Radial BA25 Wire Wound Flange Mount Vitreous Enamel RSSD 22 (Dia.) x 117mm 22mm 117mm +450°C
RS Stock No. 788-7841
Mfr. Part No.RA20117A470R0KB10
BrandVishay
MYR210.11
Each
units
470 Ω ±10% 50W - Screw Tubular Wire Wound - - RA20117 - - - +350°C
RS Stock No. 893-5103
Mfr. Part No.D25K7K0
BrandOhmite
MYR50.18
Each (In a Pack of 25)
units
7 kΩ ±10% 25W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D25 14.3 x 50.8mm 14.3mm 50.8mm +350°C
RS Stock No. 893-1069
Mfr. Part No.D225K30R-B
BrandOhmite
MYR64.963
Each (In a Pack of 25)
units
30 Ω ±10% 225W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D225 28.6 x 266.7mm 28.6mm 266.7mm +350°C
RS Stock No. 892-4721
Mfr. Part No.D100K1R0E
BrandOhmite
MYR120.57
Each
units
1 Ω ±10% 100W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D100 19.1 x 165.1mm 19.1mm 165.1mm +350°C
RS Stock No. 892-4819
Mfr. Part No.D175K50RE
BrandOhmite
MYR161.64
Each
units
50 Ω ±10% 175W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D175 28.6 x 215.9mm 28.6mm 215.9mm +350°C
RS Stock No. 892-4878
Mfr. Part No.D25K1K5E
BrandOhmite
MYR63.35
Each
units
1.5 kΩ ±10% 25W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D25 14.3 x 50.8mm 14.3mm 50.8mm +350°C
RS Stock No. 167-9773
Mfr. Part No.RA20117A10000KB10
BrandVishay
MYR300.079
Each (In a Box of 10)
units
- - - - - - - - - - - - - -
RS Stock No. 788-7845
Mfr. Part No.RA20117A10000KB10
BrandVishay
MYR253.20
Each
units
1 kΩ ±10% 50W - Screw Tubular Wire Wound - - RA20117 - - - +350°C
RS Stock No. 892-4844
Mfr. Part No.D225K500E
BrandOhmite
MYR142.32
Each
units
500 Ω ±10% 225W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D225 28.6 x 266.7mm 28.6mm 266.7mm +350°C
RS Stock No. 144-5507
Mfr. Part No.D50K50RE
MYR71.53
Each
units
50 Ω ±10% 50W ±260ppm/°C Solder - Wire Wound Bolt On Vitreous Enamel 210 14.3 (Dia.) x 101.6mm 14.3mm 101.6mm +350°C