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. 892-4853
Mfr. Part No.D225K50RE
BrandOhmite
MYR175.60
Each
units
50Ω ±10% 225W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D225 28.6 x 266.7mm 28.6mm 266.7mm +350°C
RS Stock No. 892-4803
Mfr. Part No.D175K250E
BrandOhmite
MYR140.53
Each
units
250Ω ±10% 175W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D175 28.6 x 215.9mm 28.6mm 215.9mm +350°C
RS Stock No. 892-5752
Mfr. Part No.D175K500E
BrandOhmite
MYR133.06
Each
units
500Ω ±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
MYR58.91
Each
units
1.5kΩ ±10% 25W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D25 14.3 x 50.8mm 14.3mm 50.8mm +350°C
RS Stock No. 893-5579
Mfr. Part No.D225K300-B
BrandOhmite
MYR62.575
Each (In a Pack of 50)
units
300Ω ±10% 225W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D225 28.6 x 266.7mm 28.6mm 266.7mm +350°C
RS Stock No. 892-4907
Mfr. Part No.D25K50RE
BrandOhmite
MYR61.31
Each
units
50Ω ±10% 25W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D25 14.3 x 50.8mm 14.3mm 50.8mm +350°C
RS Stock No. 892-4752
Mfr. Part No.D100K4R0E
BrandOhmite
MYR119.80
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. 788-7744
Mfr. Part No.RSSD20117A47R0JB15
BrandVishay
MYR147.80
Each
units
47Ω 5% 100W - Radial BA25 Wire Wound Flange Mount Vitreous Enamel RSSD 22 (Dia.) x 117mm 22mm 117mm +450°C
RS Stock No. 892-8195
Mfr. Part No.D100K10KE
BrandOhmite
MYR99.33
Each
units
10kΩ ±10% 100W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D100 19.1 x 165.1mm 19.1mm 165.1mm +350°C
RS Stock No. 893-0902
Mfr. Part No.E300K16RE
BrandOhmite
MYR158.08
Each
units
16Ω ±10% 300W ±400ppm/°C - - - Bolt On, Bracket Vitreous Enamel E300 28.58 x 215.9mm 28.58mm 215.9mm +400°C
RS Stock No. 892-4727
Mfr. Part No.D100K1K0E
BrandOhmite
MYR114.88
Each
units
1kΩ ±10% 100W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D100 19.1 x 165.1mm 19.1mm 165.1mm +350°C
RS Stock No. 892-4929
Mfr. Part No.D50K250E
BrandOhmite
MYR72.93
Each
units
250Ω ±10% 50W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D50 14.3 x 101.6mm 14.3mm 101.6mm +350°C
RS Stock No. 892-5742
Mfr. Part No.D12K200E
BrandOhmite
MYR56.30
Each (In a Pack of 25)
units
200Ω ±10% 12W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D12 7.94 x 44.4mm 7.94mm 44.4mm +350°C
RS Stock No. 161-7577
Mfr. Part No.ZC6/6-FT
BrandCressall
MYR673.08
Each
units
1.31Ω ±10% - - Screw - Wire Wound Bolt On - ZC - - 555mm +50°C
RS Stock No. 144-5504
Mfr. Part No.D100K2R0E
MYR126.06
Each
units
±10% 100W ±260ppm/°C Solder - Wire Wound Bolt On Vitreous Enamel 210 19.1 (Dia.) x 165.1mm 19.1mm 165.1mm +350°C
RS Stock No. 892-5758
Mfr. Part No.D75K100E
BrandOhmite
MYR104.38
Each
units
100Ω ±10% 75W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D75 14.3 x 152.4mm 14.3mm 152.4mm +350°C
RS Stock No. 893-5096
Mfr. Part No.D12K100
BrandOhmite
MYR48.174
Each (In a Pack of 25)
units
100Ω ±10% 12W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D12 7.94 x 44.4mm 7.94mm 44.4mm +350°C
RS Stock No. 893-5519
Mfr. Part No.D225K250E-B
BrandOhmite
MYR62.935
Each (In a Pack of 50)
units
250Ω ±10% 225W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D225 28.6 x 266.7mm 28.6mm 266.7mm +350°C
RS Stock No. 788-7649
Mfr. Part No.RSSD20117AR220MB15
BrandVishay
MYR162.26
Each
units
220mΩ ±20% 100W - Radial BA25 - Flange Mount Vitreous Enamel RSSD 22 (Dia.) x 117mm 22mm 117mm +450°C
RS Stock No. 161-7570
Mfr. Part No.ZC3/6-FT
BrandCressall
MYR533.87
Each
units
650mΩ ±10% - - Screw - Wire Wound Bolt On - ZC - - 330mm +50°C