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. 893-5128
Mfr. Part No.E300KR12
BrandOhmite
MYR230.27
Each (In a Pack of 5)
units
120 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. 892-4917
Mfr. Part No.D50K1K0E
BrandOhmite
MYR77.71
Each
units
1 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. 892-5746
Mfr. Part No.D25K150E
BrandOhmite
MYR63.31
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. 892-4816
Mfr. Part No.D225K10RE
BrandOhmite
MYR172.19
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. 788-7841
Mfr. Part No.RA20117A470R0KB10
BrandVishay
MYR210.11
Each
units
470 Ω ±10% 50W - Screw Tubular Wire Wound - - RA20117 - - - +350°C
RS Stock No. 892-4894
Mfr. Part No.D25K2K5E
BrandOhmite
MYR65.48
Each
units
2.5 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. 892-8366
Mfr. Part No.D12K7R5E
BrandOhmite
MYR63.15
Each
units
7.5 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. 2508389244
Mfr. Part No.E300K1R6E
BrandOhmite
MYR169.46
Each
units
- - - - - - - - - - - - - -
RS Stock No. 2508373132
Mfr. Part No.D175K10RE
BrandOhmite
MYR163.07
Each
units
- - - - - - - - - - - - - -