Question

The resistivity of potentiometer wire is 40 x 10 m and its area of cross section is 8 x 10m2. If 0.2 A current is flowing through the wire, find it's potential gradient.

Answer 1

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Rotary, Linear, and Multi-Turn Potentiometers and EncodersCustom Potentiometers Built To Your Design Specifications Within 48 Hours*
THE BEST CHOICE FOR MEETING YOUR EXACT REQUIREMENTS!
SHORT LEAD TIMES - TYPICALLY NO MINIMUM ORDER REQUIREMENTS

Series S127



  • 1/2" Square Modules
  • IP67 Sealed Standard
  • 1/2 W Conductive Plastic
  • Linear & Log taper
  • Modular Construction
  • Up to 4 Modules
  • Single Shaft 1/8" or 1/4"
  • Solder Hooks or PC Pins
  • Rotary Switch Option
  • Center & Multiple Detents
  • RoHS


Series 70
Series 72


  • 5/8" Square Modules
  • Concentric Shafts
  • Panel & Shaft Seals
  • Modular Construction
  • Up to 6 modules
  • Solder Lugs or PC Pins
  • Rotary & Push-Pull Switches
  • Linear & Log taper
  • Vernier Drive Available
  • 1/2 W Conductive Plastic
  • 2 W Cermet
  • "The Original Mod-Pot"
  • RoHS


Series 388
Series 389



  • 1/2" Square Modules
  • Concentric Shafts
  • Panel & Shaft Seals
  • Modular Construction
  • Up to 8 modules
  • Solder Hook or PC Pins
  • Rotary & Push-Pull Switches
  • Linear & Log taper
  • Center & Multiple Detents
  • 1/2 W Conductive Plastic
  • 1 W Cermet
  • "The Original Mod-Pot"
  • RoHS

Click Here for a Mod-Pot™ Series Comparison

* Normal lead time less than 2 weeks, 48-Hour VIP service subject to component availabilityCustom Potentiometers Built To Your Design Specifications
INQUIRE ABOUT LEAD TIME & MINIMUM ORDER REQUIREMENTS
Series S127B


  • 1/2" Square Modules
  • Up to 2 modules
  • Conductive Plastic or Cermet
elements
  • Linear, Audio, Reverse Audio
Tapers
  • Metal Shaft and Bushing
  • Bushing or PC board Mount
  • 1 Watt Cermet
  • 1/2 Watt Conductive Plastic
  • Rotary or Push-Pull Switch
  • Sealed IP64/IP65 Standard
  • RoHS
S159 Series

  • 5/8" Square Modules
  • Up to 4 modules
  • Conductive Plastic or Cermet
elements
  • Linear, Audio, Reverse Audio
Tapers
  • Metal Shaft and Bushing
  • Bushing or PC board Mount
  • 2 Watts Cermet
  • 1 Watt Conductive Plastic
  • Rotary Switch option
  • IP40 Rating
  • RoHS
Series 159-10


  • 5/8" Square Modules
  • 10-turn modular
  • Up to 2 modules
  • Wirewound or Hybritron®
elements
  • Linear Taper
  • ±0.25% Independent Linearity   • Metal Shaft and Bushing
  • Bushing or PC board Mount
  • 1 Watt Power Rating
  • IP40 Rating
  • RoHS
The full spectrum of potentiometer products available through State Electronics can produce a solution for nearly every potentiometer requirement. Contact your State sales representative for additional information.
Modular Potentiometers
Commercial PotentiometersMillions of combinations available including: single, dual, triple, quad modules, as well as customized switches, shafts and terminals.
High performance, low cost potentiometers for panel or pc board applications.

Precision Potentiometers
Multi-Turn PotentiometersPrecision potentiometers provide reliable control for applications in heavy equipment, robotics, industrial, test and lab equipment
A wide selection of multi-turn potentiometers can meet your requirements for accurate and stable control input.

Mil-spec Potentiometers
Linear Motion PotentiometersMil Spec units are offered with Conductive Plastic or Carbon elements. Housings are either metal or plastic depending on Mil-Type. Stainless steel shafts are standard.
For applications that require precision linear feedback. An extensive line is available for industrial, marine, medical, laboratory and robotics applications.

Joystick Controls
Hall-Effect Rotary Position SensorOur comprehensive line of industrial joystick controllers offers resistive and non-contact control in 1, 2, or 3 axes. These units can be configured to your requirements 
A non-contact sensor with direct analog voltage out - for the Highest Reliability at low cost. Long life, rugged, and programmable to your application!

Rotary EncodersTurn-Counting Dials
Optical and mechanical rotary position encoders with direct digital output. Models for commercial, precision and high-resolution are available. 
Analog and digital dials give excellent readability and precision feel, as well as high accuracy. Most models include a locking brake to keep the dial set in place.

Control Knobs & Dials Traditional and contemporary styles for rotary and slide potentiometers.
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