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. 893-0902
Mfr. Part No.E300K16RE
BrandOhmite
SGD42.03
Each
units
16Ω ±10% 300W ±400ppm/°C - - - Bolt On, Bracket Vitreous Enamel E300 28.58 x 215.9mm 28.58mm 215.9mm +400°C
RS Stock No. 892-4960
Mfr. Part No.D75K15RE
BrandOhmite
SGD35.37
Each
units
15Ω ±10% 75W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D75 14.3 x 152.4mm 14.3mm 152.4mm +350°C
RS Stock No. 892-4866
Mfr. Part No.D25K15RE
BrandOhmite
SGD14.15
Each
units
15Ω ±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
SGD17.50
Each
units
500Ω ±10% 12W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D12 7.94 x 44.4mm 7.94mm 44.4mm +350°C
RS Stock No. 892-4910
Mfr. Part No.D25K5R0E
BrandOhmite
SGD14.15
Each
units
±10% 25W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D25 14.3 x 50.8mm 14.3mm 50.8mm +350°C
RS Stock No. 892-4806
Mfr. Part No.D175K25RE
BrandOhmite
SGD50.11
Each
units
25Ω ±10% 175W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D175 28.6 x 215.9mm 28.6mm 215.9mm +350°C
RS Stock No. 788-7747
Mfr. Part No.RSSD20117A22R0JB15
BrandVishay
SGD34.43
Each
units
22Ω 5% 100W - Radial BA25 Wire Wound Flange Mount Vitreous Enamel RSSD 22 (Dia.) x 117mm 22mm 117mm +450°C
RS Stock No. 892-4926
Mfr. Part No.D50K20KE
BrandOhmite
SGD21.61
Each
units
20kΩ ±10% 50W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D50 14.3 x 101.6mm 14.3mm 101.6mm +350°C
RS Stock No. 788-7652
Mfr. Part No.RSSD25168AR220MB06
BrandVishay
SGD66.38
Each
units
220mΩ ±20% 200W ±75ppm/°C Radial BA25 - Bolt On Vitreous Enamel RSSD 27 (Dia.) x 168mm 27mm 168mm +450°C
RS Stock No. 161-7580
Mfr. Part No.ZC6/10-FT
BrandCressall
SGD213.00
Each
units
3.96Ω ±10% - - Screw - Wire Wound Bolt On - ZC - - 555mm +50°C
RS Stock No. 893-5103
Mfr. Part No.D25K7K0
BrandOhmite
SGD17.483
Each (In a Pack of 25)
units
7kΩ ±10% 25W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D25 14.3 x 50.8mm 14.3mm 50.8mm +350°C
RS Stock No. 892-5755
Mfr. Part No.D25K3R0E
BrandOhmite
SGD16.99
Each
units
±10% 25W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D25 14.3 x 50.8mm 14.3mm 50.8mm +350°C
RS Stock No. 892-4913
Mfr. Part No.D50K10RE
BrandOhmite
SGD18.20
Each
units
10Ω ±10% 50W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D50 14.3 x 101.6mm 14.3mm 101.6mm +350°C
RS Stock No. 892-8366
Mfr. Part No.D12K7R5E
BrandOhmite
SGD16.94
Each
units
7.5Ω ±10% 12W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D12 7.94 x 44.4mm 7.94mm 44.4mm +350°C
RS Stock No. 161-7572
Mfr. Part No.ZC3/9-FT
BrandCressall
SGD202.97
Each
units
1.26Ω ±10% - - Screw - Wire Wound Bolt On - ZC - - 330mm +50°C
RS Stock No. 892-4812
Mfr. Part No.D225K100E
BrandOhmite
SGD41.64
Each
units
100Ω ±10% 225W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D225 28.6 x 266.7mm 28.6mm 266.7mm +350°C
RS Stock No. 892-8353
Mfr. Part No.D25K250E
BrandOhmite
SGD16.99
Each
units
250Ω ±10% 25W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D25 14.3 x 50.8mm 14.3mm 50.8mm +350°C
RS Stock No. 892-8195
Mfr. Part No.D100K10KE
BrandOhmite
SGD32.99
Each
units
10kΩ ±10% 100W ±260ppm/°C - - - Bolt On, Bracket Vitreous Enamel D100 19.1 x 165.1mm 19.1mm 165.1mm +350°C
RS Stock No. 2508373132
Mfr. Part No.D175K10RE
BrandOhmite
SGD63.77
Each
units
- - - - - - - - - - - - - -
RS Stock No. 2508389244
Mfr. Part No.E300K1R6E
BrandOhmite
SGD66.27
Each
units
- - - - - - - - - - - - - -
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