The Wincom Sliding Rheostat is a classic, heavy-duty laboratory variable resistor designed to adjust, control, and monitor electrical current and resistance within DC and AC circuits. Featuring a high-resistance wire tightly wound around a heavy insulating ceramic tube, it utilizes a smooth-gliding metal slider to vary the electrical resistance instantly. It is a fundamental circuit apparatus specified for physics laboratories, electrical engineering training institutes, and school science practical rooms to demonstrate circuit laws and manage power inputs safely.

Technical Specifications

• Instrument Type: Wire-Wound Sliding Rheostat / Variable Resistor

• Material Composition: Constantan or oxidized Ni-Cr (Nickel-Chromium) alloy wire wound over a porcelain/ceramic insulating core

• Resistance and Current Configurations: Available in standard educational and industrial ratings:

  • 5 Ohms / 3.0 Amperes

  • 20 Ohms / 2.0 Amperes

  • 50 Ohms / 1.5 Amperes

  • 200 Ohms / 1.2 Amperes (Custom project variants also available)

• Slide Guide Rod: Solid chrome-plated heavy steel rod with a low-friction slider block

• Terminal Interface: Three 4mm color-coded insulated safety binding posts (allows use as both a variable resistor and a potential divider)

• End Supports: Impact-resistant, heavy-duty cast iron or reinforced polymer mounting brackets

Key Features

• Precision Wire-Wound Porcelain Tube: Built with high-purity resistance wire wound uniformly over a thick-walled ceramic cylinder, ensuring high heat capacity and complete insulation from structural frames.

• Fluid-Glide Metal Contact Slider: Outfitted with a premium metal leaf contact slider paired with an ergonomic insulated plastic guide knob, allowing operators to execute millimeter-smooth micro resistance tweaks.

• Multi-Functional 3-Terminal Architecture: Equipped with two fixed base terminals and one sliding top terminal, allowing the rheostat to function either as a 2-terminal series current limiter or as a 3-terminal voltage divider (potentiometer).

• Excellent Heat Dissipation: The open-air exposed wire design allows convective cooling, keeping performance stable and preventing resistance drifts during extended circuit loading.

• Anti-Slip Weighted Base Framework: Reinforced with heavy, wide-set metal end pillars that keep the unit steady on workbenches, preventing tipping or sliding when moving the adjustment block.

Primary Applications

• School and College Physics Labs: Demonstrating Ohm’s Law, charting current-voltage ($I-V$) curves, and calculating unknown internal battery resistances.

• Electrical Engineering & Training Hubs: Adjusting current limits for small electric motors, evaluating transformer circuits, and setting up analog simulation boards.

• Custom Power Regulation Trays: Serving as a manual dimming controller for light bulbs or adjusting thermal dissipation profiles in low-voltage heating coils.

• Calibration and Test Benches: Providing temporary load testing variables for electronics prototyping and checking meter deflection accuracy.