Short Length Variable Resistor

Product Code : SCL-EAE-11317

The Short Length Variable Resistor is a compact laboratory rheostat used to vary resistance, regulate current and obtain an adjustable voltage in low-voltage circuits. Its movable contact changes the effective length of resistance wire connected in the circuit, providing continuous manual adjustment during physics and electrical experiments.

Product Description

The apparatus consists of resistance wire wound around an insulated, heat-resistant tube. A sliding contact moves along the winding and selects the active wire length between the contact and a connected end terminal. Increasing the active length increases resistance, while reducing it lowers resistance and permits greater current flow.

Lab Equipments Ambala publishes comparable Constantine/Eureka-wire and grooved nichrome-wire rheostats. The requested short-length version must be defined using an exact tube length, winding length or overall dimension. The required resistance, current capacity, power rating and wire alloy should also be selected according to the intended laboratory circuit.

Key Features

• Compact laboratory format: Intended for installations where a shorter rheostat body or winding is required.
• Continuous resistance adjustment: The sliding contact changes the effective resistance smoothly.
• Current-control operation: Can be connected in series with a load within its confirmed ratings.
• Potential-divider capability: A suitable three-terminal arrangement provides adjustable voltage output.
• Wire-wound construction: Compatible product families use Constantine/Eureka or nichrome resistance wire.
• Heat-resistant support: Published rheostat families use an insulated porcelain resistance tube.
• Manual operation: Requires no independent power source beyond the experimental circuit.

Technical Specifications

What's Included

• One short-length variable resistor assembly
• Wire-wound insulated resistance tube
• Movable slider and guide rod
• Laboratory connection terminals
• Connecting leads
• Circuit diagram or operating instructions

Applications

• Controlling current in low-voltage laboratory circuits.
• Providing adjustable resistance in Ohm’s law experiments.
• Obtaining variable voltage through a potential-divider connection.
• Protecting galvanometers and sensitive circuit components.
• Adjusting current through lamps, coils and electromagnets.
• Supporting meter-bridge, potentiometer and circuit practicals.

Related equipment includes the Constantine Wire Rheostat, the Nichrome Wire Rheostat, the Plug-Type Resistance Box and broader Electrical and Electronics Equipment.

How to Use the Short Length Variable Resistor

1. Switch off the low-voltage laboratory power supply.
2. For current control, connect one winding-end terminal and the slider terminal in series with the load.
3. Set the slider initially to provide a high resistance.
4. Switch on the supply while monitoring circuit current.
5. Move the slider gradually until the required current is obtained.
6. For potential-divider use, connect the supply across both winding ends and take the output from the slider.
7. Keep current and power within the confirmed ratings.
8. Switch off the supply before changing any connection.

Safety note: The resistance winding and tube can become hot during operation. Do not touch them immediately after use, exceed the confirmed current rating or connect the rheostat directly to an unsuitable mains supply.

Care & Maintenance

• Keep the resistance winding clean and free from conductive debris.
• Move the slider gently without forcing it across damaged wire.
• Inspect terminals, supports and contact pressure periodically.
• Allow the apparatus to cool fully before handling or storage.

Why Choose Lab Equipments Ambala

Lab Equipments Ambala manufactures and supplies educational rheostats, resistance boxes and electrical laboratory equipment from Ambala, India. Its published range includes Constantine/Eureka-wire and nichrome-wire rheostats for current-control and potential-divider experiments. The equipment is intended for schools, colleges and institutional laboratories. Buyers should define the required short length, resistance, current capacity and wire alloy when requesting a quotation.

Frequently Asked Questions

What is a Short Length Variable Resistor used for?

It is used to vary resistance, regulate current and provide adjustable voltage in low-voltage educational circuits.

What does short length mean?

The term is not a standardized published dimension. The required tube length, winding length or overall size must be confirmed.

What resistance value is supplied?

The resistance value is not determined by the short-length designation and must be specified separately in ohms.

Which resistance wire is used?

Comparable published rheostats use Constantine/Eureka or nichrome wire. The required alloy must be selected for this model.

Can it be used as a potential divider?

Yes, provided the apparatus gives access to both winding ends and the sliding-contact terminal.

Does the resistor need its own power supply?

No. It is a passive component that operates within a suitable low-voltage experimental circuit.

Specify the required physical length, resistance, current rating and winding alloy, or explore the Electrical and Electronics Equipment category for related laboratory rheostats.