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. 892-4850
Mfr. Part No.D25K100E
BrandOhmite
HK$139.18
Each
units
100 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. 892-6688
Mfr. Part No.D50K400E
BrandOhmite
HK$154.15
Each
units
400 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. 893-0918
Mfr. Part No.E300K2R0E
BrandOhmite
HK$364.42
Each
units
2 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. 893-0943
Mfr. Part No.E300KR31E
BrandOhmite
HK$413.978
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. 892-4812
Mfr. Part No.D225K100E
BrandOhmite
HK$317.08
Each
units
100 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. 892-4771
Mfr. Part No.D12K250E
BrandOhmite
HK$123.044
Each (In a Pack of 25)
units
250 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. 892-4923
Mfr. Part No.D50K25RE
BrandOhmite
HK$161.95
Each
units
25 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. 892-4862
Mfr. Part No.D25K10RE
BrandOhmite
HK$132.12
Each
units
10 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. 788-7762
Mfr. Part No.RSSD25168A22R0JB06
BrandVishay
HK$591.65
Each
units
22 Ω 5% 200W - Radial BA25 Wire Wound Bolt On Vitreous Enamel RSSD 27 (Dia.) x 168mm 27mm 168mm +450°C
RS Stock No. 144-5497
Mfr. Part No.C300K10RE
HK$212.85
Each
units
10 Ω ±10% 300W ±400ppm/°C Solder Tubular Wire Wound - - 280 28.58 (Dia.) x 215.9mm - - +400°C
RS Stock No. 892-4901
Mfr. Part No.D25K5K0E
BrandOhmite
HK$132.03
Each
units
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. 892-4907
Mfr. Part No.D25K50RE
BrandOhmite
HK$126.92
Each
units
50 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. 788-7738
Mfr. Part No.RSSD20117A1R00KB15
BrandVishay
HK$407.33
Each
units
1 Ω 10% 100W - Radial BA25 Wire Wound Flange Mount Vitreous Enamel RSSD 22 (Dia.) x 117mm 22mm 117mm +450°C
RS Stock No. 892-4963
Mfr. Part No.D75K25RE
BrandOhmite
HK$225.01
Each
units
25 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. 892-5746
Mfr. Part No.D25K150E
BrandOhmite
HK$136.43
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. 161-7576
Mfr. Part No.ZC6/5-FT
BrandCressall
HK$1,350.59
Each
units
980 mΩ ±10% - - Screw - Wire Wound Bolt On - ZC - - 555mm +50°C
RS Stock No. 892-8537
Mfr. Part No.D225K10KE
BrandOhmite
HK$309.98
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. 893-0902
Mfr. Part No.E300K16RE
BrandOhmite
HK$334.13
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. 788-7731
Mfr. Part No.RSSD20117A1000JB15
BrandVishay
HK$383.11
Each
units
100 Ω 5% 100W - Radial BA25 Wire Wound Flange Mount Vitreous Enamel RSSD 22 (Dia.) x 117mm 22mm 117mm +450°C
RS Stock No. 788-7659
Mfr. Part No.RSSD25168A2R20KB06
BrandVishay
HK$384.43
Each
units
2.2 Ω ±10% 200W - Radial BA25 - Bolt On Vitreous Enamel RSSD 27 (Dia.) x 168mm 27mm 168mm +450°C