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. 892-5742
Mfr. Part No.D12K200E
BrandOhmite
MYR55.22
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. 892-4783
Mfr. Part No.D12K500E
BrandOhmite
MYR65.32
Each
units
500 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. 161-7577
Mfr. Part No.ZC6/6-FT
BrandCressall
MYR747.87
Each
units
1.31 Ω ±10% - - Screw - Wire Wound Bolt On - ZC - - 555mm +50°C
RS Stock No. 891-8568
Mfr. Part No.D50K500E
BrandOhmite
MYR71.53
Each
units
500 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. 144-5497
Mfr. Part No.C300K10RE
MYR98.77
Each
units
10 Ω ±10% 300W ±400ppm/°C Solder Tubular Wire Wound - - 280 28.58 (Dia.) x 215.9mm - - +400°C
RS Stock No. 892-8593
Mfr. Part No.D75K750E
BrandOhmite
MYR102.37
Each
units
750 Ω ±10% 75W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D75 14.3 x 152.4mm 14.3mm 152.4mm +350°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. 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. 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. 892-5746
Mfr. Part No.D25K150E
BrandOhmite
MYR63.31
Each
units
150 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. 892-4904
Mfr. Part No.D25K2R0E
BrandOhmite
MYR65.36
Each
units
2 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. 893-3481
Mfr. Part No.D50K150E
BrandOhmite
MYR79.51
Each
units
150 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. 892-4948
Mfr. Part No.D50K3R0E
BrandOhmite
MYR83.64
Each
units
3 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. 893-0943
Mfr. Part No.E300KR31E
BrandOhmite
MYR192.11
Each (In a Pack of 5)
units
310 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. 892-4752
Mfr. Part No.D100K4R0E
BrandOhmite
MYR117.51
Each
units
4 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. 892-4954
Mfr. Part No.D50K5K0E
BrandOhmite
MYR60.33
Each (In a Pack of 25)
units
5 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. 893-5128
Mfr. Part No.E300KR12
BrandOhmite
MYR230.27
Each (In a Pack of 5)
units
120 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. 892-4715
Mfr. Part No.D100K100E
BrandOhmite
MYR111.45
Each
units
100 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. 893-0902
Mfr. Part No.E300K16RE
BrandOhmite
MYR155.05
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. 893-5119
Mfr. Part No.D75K250
BrandOhmite
MYR87.94
Each (In a Pack of 25)
units
250 Ω ±10% 75W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D75 14.3 x 152.4mm 14.3mm 152.4mm +350°C