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. 788-7772
Mfr. Part No.RSSD30250A1000JB06
BrandVishay
TWD1,931
Each
units
100 Ω 5% 280W - Radial BA25 Wire Wound Bolt On Vitreous Enamel RSSD 32 (Dia.) x 250mm 32mm 250mm +450°C
RS Stock No. 144-5508
Mfr. Part No.D50K5R0E
BrandOhmite
TWD840
Each
units
5 Ω ±10% 50W ±260ppm/°C Solder - Wire Wound Bolt On Vitreous Enamel 210 14.3 (Dia.) x 101.6mm 14.3mm 101.6mm +350
RS Stock No. 144-5509
Mfr. Part No.D50K75RE
BrandOhmite
TWD743
Each
units
75 Ω ±10% 50W ±260ppm/°C Solder - Wire Wound Bolt On Vitreous Enamel 210 14.3 (Dia.) x 101.6mm 14.3mm 101.6mm +350
RS Stock No. 892-4878
Mfr. Part No.D25K1K5E
BrandOhmite
TWD356
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. 892-4932
Mfr. Part No.D50K2K0E
BrandOhmite
TWD620
Each
units
2 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. 893-0946
Mfr. Part No.E300KR50E
BrandOhmite
TWD1,545
Each
units
500 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. 892-5749
Mfr. Part No.D12K10KE
BrandOhmite
TWD451
Each (In a Pack of 25)
units
10 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. 893-5112
Mfr. Part No.D25K7K0E
BrandOhmite
TWD453
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. 892-8347
Mfr. Part No.D50K750E
BrandOhmite
TWD592
Each
units
750 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. 892-4774
Mfr. Part No.D12K150E
BrandOhmite
TWD345
Each
units
150 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. 892-4869
Mfr. Part No.D25K10KE
BrandOhmite
TWD453
Each
units
10 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. 892-4787
Mfr. Part No.D12K50RE
BrandOhmite
TWD345
Each
units
50 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. 892-4935
Mfr. Part No.D50K2R0E
BrandOhmite
TWD521
Each
units
2 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. 892-4780
Mfr. Part No.D12K2K0E
BrandOhmite
TWD443
Each
units
2 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. 893-5594
Mfr. Part No.E500K20RE
BrandOhmite
TWD6,357
Each
units
20 Ω ±10% 500W ±400ppm/°C - - - Bolt On, Bracket Vitreous Enamel E500 41.28 x 266.7mm 41.28mm 266.7mm +400°C
RS Stock No. 892-5752
Mfr. Part No.D175K500E
BrandOhmite
TWD1,124
Each
units
500 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. 892-4834
Mfr. Part No.D225K2K5E
BrandOhmite
TWD1,017
Each
units
2.5 kΩ ±10% 225W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D225 28.6 x 266.7mm 28.6mm 266.7mm +350°C
New
RS Stock No. 161-7578
Mfr. Part No.ZC6/8-FT
BrandCressall
TWD5,304
Each
units
1.68 Ω ±10% - - Screw - Wire Wound Bolt On - ZC - - 555mm +50°C
RS Stock No. 893-0902
Mfr. Part No.E300K16RE
BrandOhmite
TWD1,026
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. 892-8335
Mfr. Part No.D100K2K5E
BrandOhmite
TWD874
Each
units
2.5 kΩ ±10% 100W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D100 19.1 x 165.1mm 19.1mm 165.1mm +350°C