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. 788-7766
Mfr. Part No.RSSD25168A4R70KB06
BrandVishay
HK$452.56
Each
units
4.7 Ω 10% 200W - Radial BA25 Wire Wound Bolt On Vitreous Enamel RSSD 27 (Dia.) x 168mm 27mm 168mm +450°C
RS Stock No. 788-7734
Mfr. Part No.RSSD20117A10R0JB15
BrandVishay
HK$256.47
Each
units
10 Ω 5% 100W - Radial BA25 Wire Wound Flange Mount Vitreous Enamel RSSD 22 (Dia.) x 117mm 22mm 117mm +450°C
RS Stock No. 788-7716
Mfr. Part No.RSSD10X50A10R0JS06
BrandVishay
HK$190.08
Each
units
10 Ω 5% 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
HK$205.00
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. 892-4954
Mfr. Part No.D50K5K0E
BrandOhmite
HK$128.385
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. 893-0930
Mfr. Part No.E300KR20E
BrandOhmite
HK$460.624
Each (In a Pack of 5)
units
200 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. 788-7643
Mfr. Part No.RSSD20117A2R20KB15
BrandVishay
HK$208.25
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. 788-7845
Mfr. Part No.RA20117A10000KB10
BrandVishay
HK$851.12
Each
units
1 kΩ ±10% 50W - Screw BO10 Wire Wound - - RA20117 - - - +350°C
RS Stock No. 167-9819
Mfr. Part No.RA20117A470R0KB10
BrandVishay
HK$566.952
Each (In a Box of 10)
units
- - - - - - - - - - - - - -
RS Stock No. 167-9773
Mfr. Part No.RA20117A10000KB10
BrandVishay
HK$566.952
Each (In a Box of 10)
units
- - - - - - - - - - - - - -
RS Stock No. 788-7841
Mfr. Part No.RA20117A470R0KB10
BrandVishay
HK$760.00
Each
units
470 Ω ±10% 50W - Screw BO10 Wire Wound - - RA20117 - - - +350°C
RS Stock No. 788-7788
Mfr. Part No.RSSD30250A3300JB06
BrandVishay
HK$400.00
Each
units
330 Ω 5% 280W - Radial BA25 Wire Wound Bolt On Vitreous Enamel RSSD 32 (Dia.) x 250mm 32mm 250mm +450°C
RS Stock No. 892-4948
Mfr. Part No.D50K3R0E
BrandOhmite
HK$132.85
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. 892-4800
Mfr. Part No.D175K2K5E
BrandOhmite
HK$242.54
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. 893-0912
Mfr. Part No.E300K3R1E
BrandOhmite
HK$280.49
Each
units
3 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. 892-4939
Mfr. Part No.D50K300E
BrandOhmite
HK$125.93
Each
units
300 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. 893-5115
Mfr. Part No.D50K50R
BrandOhmite
HK$164.692
Each (In a Pack of 25)
units
50 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. 892-4866
Mfr. Part No.D25K15RE
BrandOhmite
HK$88.14
Each
units
15 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. 892-4803
Mfr. Part No.D175K250E
BrandOhmite
HK$228.96
Each
units
250 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. 892-8593
Mfr. Part No.D75K750E
BrandOhmite
HK$215.84
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
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