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. 893-5579
Mfr. Part No.D225K300-B
BrandOhmite
TWD436.10
Each (In a Pack of 50)
units
300 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. 892-8537
Mfr. Part No.D225K10KE
BrandOhmite
TWD1,148.00
Each
units
10 kΩ ±10% 225W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D225 28.6 x 266.7mm 28.6mm 266.7mm +350°C
RS Stock No. 892-4800
Mfr. Part No.D175K2K5E
BrandOhmite
TWD1,047.00
Each
units
2.5 kΩ ±10% 175W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D175 28.6 x 215.9mm 28.6mm 215.9mm +350°C
RS Stock No. 161-7577
Mfr. Part No.ZC6/6-FT
BrandCressall
TWD5,065.00
Each
units
1.31 Ω ±10% - - Screw - Wire Wound Bolt On - ZC - - 555mm +50°C
RS Stock No. 788-7722
Mfr. Part No.RSSD10X50A5R60KS06
BrandVishay
TWD746.00
Each
units
5.6 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. 788-7744
Mfr. Part No.RSSD20117A47R0JB15
BrandVishay
TWD1,134.00
Each
units
47 Ω 5% 100W - Radial BA25 Wire Wound Flange Mount Vitreous Enamel RSSD 22 (Dia.) x 117mm 22mm 117mm +450°C
RS Stock No. 891-8561
Mfr. Part No.D50K1R0E
BrandOhmite
TWD680.00
Each
units
1 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. 893-0924
Mfr. Part No.E300K6R3E
BrandOhmite
TWD1,257.00
Each
units
6 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. 892-4816
Mfr. Part No.D225K10RE
BrandOhmite
TWD1,411.00
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. 892-4787
Mfr. Part No.D12K50RE
BrandOhmite
TWD497.00
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. 892-4894
Mfr. Part No.D25K2K5E
BrandOhmite
TWD533.00
Each
units
2.5 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. 892-4783
Mfr. Part No.D12K500E
BrandOhmite
TWD491.00
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. 788-7756
Mfr. Part No.RSSD25168A10R0JB06
BrandVishay
TWD2,211.00
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. 788-7649
Mfr. Part No.RSSD20117AR220MB15
BrandVishay
TWD1,675.00
Each
units
220 mΩ ±20% 100W - Radial BA25 - Flange Mount Vitreous Enamel RSSD 22 (Dia.) x 117mm 22mm 117mm +450°C
RS Stock No. 893-5096
Mfr. Part No.D12K100
BrandOhmite
TWD372.60
Each (In a Pack of 25)
units
100 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. 893-0921
Mfr. Part No.E300K4R0E
BrandOhmite
TWD1,349.00
Each
units
4 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. 892-4890
Mfr. Part No.D25K2K0E
BrandOhmite
TWD515.00
Each
units
2 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. 788-7769
Mfr. Part No.RSSD25168A2200JB06
BrandVishay
TWD1,991.00
Each
units
220 Ω 5% 200W - Radial BA25 Wire Wound Bolt On Vitreous Enamel RSSD 27 (Dia.) x 168mm 27mm 168mm +450°C
RS Stock No. 892-4768
Mfr. Part No.D100K5R0E
BrandOhmite
TWD934.00
Each
units
5 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. 893-0943
Mfr. Part No.E300KR31E
BrandOhmite
TWD1,512.40
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