Quick Answer: The Rheostat 12 Inches is a sliding variable resistor with oxidised alloy wire wound on a ceramic tube over a 300 mm (12 inch) active length. A metal wiper with an insulated handle runs along the winding between three 4mm binding posts.
Last updated: October 2026
Key Features
300 mm (12 inch) active winding length
Oxidised alloy resistance wire on a heat-resistant ceramic tube
Three 4mm binding posts
Metal contact wiper with an insulated handle
Die-cast metal end supports with a chemical-resistant coating
Technical Specifications
Specification
Value
Core
Insulated ceramic tube
Resistance element
Oxidised alloy wire
Active length
300 mm (12 inches)
Terminals
Three 4mm binding posts
Slider
Metal contact wiper, insulated handle
Supports
Die-cast metal, chemical-resistant coating
About This Product
Moving the slider changes how much of the winding is in circuit, so one rheostat can set the current in a series circuit or, using all three terminals, act as a potential divider. The long 12 inch winding gives fine steps when taking readings for V-I graphs and Ohm’s law practicals.
Frequently Asked Questions
Can the Rheostat 12 Inches be used as a potential divider?
Yes. It has three terminals, so it can be wired as a variable resistor in series or as a voltage divider across a supply.
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