Feature:1. PRINCIPLE OPERATION: Slide rheostat resistance can be used to control the function of a circuit by changing its own resistance.2. DUAL USE: The laboratory researching tool can be used as a constant/variable resistor to meet different circuit analysis needs.3. APPLICATIONS: Sliding rheostat can be used as a current and voltage regulator for laboratory research and demonstration, as well as for excitation and speed control of power generation equipment and DC motors.4. SAFETY AND RELIABILITY: The sliding head and insulated wiring hat are designed for safe and reliable use and are suitable for teaching physics and electricity.5. DURABILITY: Alloy wire porcelain tube and contact copper sheet, exquisite workmanship, durability, and long service time.Specification:Item Type: 2A 20 Slide Rheostat ResistanceMaterial: Alloy Wire Porcelain Tube, Contact Copper SheetApplication Scenario: Physics Electricity Teaching, Circuit Analysis.Package List:1 xSlide Rheostat Resistance