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. 161-7577
Mfr. Part No.ZC6/6-FT
BrandCressall
MYR814.66
Each
units
1.31 Ω ±10% - - Screw - Wire Wound Bolt On - ZC - - 555mm +50°C
RS Stock No. 893-0930
Mfr. Part No.E300KR20E
BrandOhmite
MYR205.654
Each (In a Pack of 5)
units
200 mΩ ±10% 300W ±400ppm/°C - - - Bolt On, Bracket Vitreous Enamel E300 28.58 x 215.9mm 28.58mm 215.9mm +400°C
RS Stock No. 891-8580
Mfr. Part No.D50K100KE
BrandOhmite
MYR87.49
Each
units
100 kΩ ±10% 50W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D50 14.3 x 101.6mm 14.3mm 101.6mm +350°C
RS Stock No. 893-0899
Mfr. Part No.E300K10RE
BrandOhmite
MYR165.98
Each
units
10 Ω ±10% 300W ±400ppm/°C - - - Bolt On, Bracket Vitreous Enamel E300 28.58 x 215.9mm 28.58mm 215.9mm +400°C
RS Stock No. 788-7643
Mfr. Part No.RSSD20117A2R20KB15
BrandVishay
MYR140.65
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. 788-7756
Mfr. Part No.RSSD25168A10R0JB06
BrandVishay
MYR254.82
Each
units
10 Ω 5% 200W - Radial BA25 Wire Wound Bolt On Vitreous Enamel RSSD 27 (Dia.) x 168mm 27mm 168mm +450°C
RS Stock No. 892-8451
Mfr. Part No.D50K200E
BrandOhmite
MYR71.53
Each
units
200 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. 892-1163
Mfr. Part No.E300K5R0E
BrandOhmite
MYR170.98
Each
units
5 Ω ±10% 300W ±400ppm/°C - - - Bolt On, Bracket Vitreous Enamel E300 28.58 x 215.9mm 28.58mm 215.9mm +400°C
RS Stock No. 892-5742
Mfr. Part No.D12K200E
BrandOhmite
MYR56.30
Each (In a Pack of 25)
units
200 Ω ±10% 12W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D12 7.94 x 44.4mm 7.94mm 44.4mm +350°C
RS Stock No. 892-4759
Mfr. Part No.D100K50RE
BrandOhmite
MYR117.33
Each
units
50 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. 893-0912
Mfr. Part No.E300K3R1E
BrandOhmite
MYR165.89
Each
units
3 Ω ±10% 300W ±400ppm/°C - - - Bolt On, Bracket Vitreous Enamel E300 28.58 x 215.9mm 28.58mm 215.9mm +400°C
RS Stock No. 892-4819
Mfr. Part No.D175K50RE
BrandOhmite
MYR168.84
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. 893-5112
Mfr. Part No.D25K7K0E
BrandOhmite
MYR48.561
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. 893-0902
Mfr. Part No.E300K16RE
BrandOhmite
MYR165.98
Each
units
16 Ω ±10% 300W ±400ppm/°C - - - Bolt On, Bracket Vitreous Enamel E300 28.58 x 215.9mm 28.58mm 215.9mm +400°C
RS Stock No. 788-7649
Mfr. Part No.RSSD20117AR220MB15
BrandVishay
MYR171.68
Each
units
220 mΩ ±20% 100W - Radial BA25 - Flange Mount Vitreous Enamel RSSD 22 (Dia.) x 117mm 22mm 117mm +450°C
RS Stock No. 892-4913
Mfr. Part No.D50K10RE
BrandOhmite
MYR76.58
Each
units
10 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. 788-7725
Mfr. Part No.RSSD10X50A1R00KS06
BrandVishay
MYR108.48
Each
units
1 Ω 10% 25W - Radial BA25 Wire Wound Flange Mount Vitreous Enamel RSSD 11.5 (Dia.) x 50mm 11.5mm 50mm +450°C
RS Stock No. 892-4866
Mfr. Part No.D25K15RE
BrandOhmite
MYR63.31
Each
units
15 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. 892-4929
Mfr. Part No.D50K250E
BrandOhmite
MYR76.58
Each
units
250 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. 144-5503
Mfr. Part No.D100K25RE
MYR114.18
Each
units
25 Ω ±10% 100W ±260ppm/°C Solder - Wire Wound Bolt On Vitreous Enamel 210 19.1 (Dia.) x 165.1mm 19.1mm 165.1mm +350°C