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. 788-7788
Mfr. Part No.RSSD30250A3300JB06
BrandVishay
TWD1,520
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. 788-7790
Mfr. Part No.RSSD30250A47R0JB06
BrandVishay
TWD2,388
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. 892-5749
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. 144-5506
Mfr. Part No.D25K300E
BrandOhmite
TWD511
Each
units
300 Ω ±10% 25W ±260ppm/°C Solder - Wire Wound Bolt On Vitreous Enamel 210 14.3 (Dia.) x 50.8mm 14.3mm 50.8mm +350
RS Stock No. 892-4960
Mfr. Part No.D75K15RE
BrandOhmite
TWD820
Each
units
15 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. 892-4910
Mfr. Part No.D25K5R0E
BrandOhmite
TWD345
Each
units
5 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. 788-7797
Mfr. Part No.RSSD30250A4R70KB06
BrandVishay
TWD1,580
Each
units
4.7 Ω 10% 280W - Radial BA25 Wire Wound Bolt On Vitreous Enamel RSSD 32 (Dia.) x 250mm 32mm 250mm +450°C
RS Stock No. 788-7649
Mfr. Part No.RSSD20117AR220MB15
BrandVishay
TWD1,270
Each
units
220 mΩ ±20% 100W - Radial BA25 - Flange Mount Vitreous Enamel RSSD 22 (Dia.) x 117mm 22mm 117mm +450°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. 892-4869
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. 892-8192
Mfr. Part No.D50K100E
BrandOhmite
TWD444
Each
units
100 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. 893-0902
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. 893-5513
Mfr. Part No.D225K500E-B
BrandOhmite
TWD452
Each
units
500 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. 161-7577
Mfr. Part No.ZC6/6-FT
BrandCressall
TWD7,008
Each
units
1.31 Ω ±10% - - Screw - Wire Wound Bolt On - ZC - - 555mm +50°C
RS Stock No. 892-6688
Mfr. Part No.D50K400E
BrandOhmite
TWD493
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. 893-5115
Mfr. Part No.D50K50R
BrandOhmite
TWD645
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. 144-5507
Mfr. Part No.D50K50RE
BrandOhmite
TWD743
Each
units
50 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. 788-7731
Mfr. Part No.RSSD20117A1000JB15
BrandVishay
TWD720
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. 892-5755
Mfr. Part No.D25K3R0E
BrandOhmite
TWD415
Each
units
3 Ω ±10% 25W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D25 14.3 x 50.8mm 14.3mm 50.8mm +350°C