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. 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. 167-9906
Mfr. Part No.RA20117A100R0KB10
BrandVishay
HK$629.876
Each (In a Box of 10)
units
- - - - - - - - - - - - - -
RS Stock No. 892-4822
Mfr. Part No.D225K250E
BrandOhmite
HK$311.96
Each
units
250 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. 893-1069
Mfr. Part No.D225K30R-B
BrandOhmite
HK$113.248
Each (In a Pack of 25)
units
30 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. 892-8410
Mfr. Part No.D100K5K0E
BrandOhmite
HK$217.70
Each
units
5 kΩ ±10% 100W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D100 19.1 x 165.1mm 19.1mm 165.1mm +350°C
RS Stock No. 892-4787
Mfr. Part No.D12K50RE
BrandOhmite
HK$136.08
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. 892-4799
Mfr. Part No.D12K5R0E
BrandOhmite
HK$137.23
Each
units
5 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. 788-7725
Mfr. Part No.RSSD10X50A1R00KS06
BrandVishay
HK$173.61
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. 892-6688
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. 892-4897
Mfr. Part No.D25K25RE
BrandOhmite
HK$131.45
Each
units
25 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. 892-4838
Mfr. Part No.D225K2R0E
BrandOhmite
HK$444.39
Each
units
2 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. 788-7740
Mfr. Part No.RSSD20117A4R70KB15
BrandVishay
HK$375.82
Each
units
4.7 Ω 10% 100W - Radial BA25 Wire Wound Flange Mount Vitreous Enamel RSSD 22 (Dia.) x 117mm 22mm 117mm +450°C
RS Stock No. 892-4941
Mfr. Part No.D50K50KE
BrandOhmite
HK$167.83
Each
units
50 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. 892-4853
Mfr. Part No.D225K50RE
BrandOhmite
HK$371.15
Each
units
50 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. 893-3481
Mfr. Part No.D50K150E
BrandOhmite
HK$154.24
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. 788-7790
Mfr. Part No.RSSD30250A47R0JB06
BrandVishay
HK$673.19
Each
units
47 Ω 5% 280W - Radial BA25 Wire Wound Bolt On Vitreous Enamel RSSD 32 (Dia.) x 250mm 32mm 250mm +450°C
RS Stock No. 892-4816
Mfr. Part No.D225K10RE
BrandOhmite
HK$373.79
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. 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. 788-7784
Mfr. Part No.RSSD30250A22R0JB06
BrandVishay
HK$686.26
Each
units
22 Ω 5% 280W - Radial BA25 Wire Wound Bolt On Vitreous Enamel RSSD 32 (Dia.) x 250mm 32mm 250mm +450°C
RS Stock No. 893-5119
Mfr. Part No.D75K250
BrandOhmite
HK$189.50
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