Medium Length Variable Resistor

Product Code : SCL-EAE-11315

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

Product Description

The apparatus consists of resistance wire wound around an insulated, heat-resistant tube. A movable contact travels along a guide rod and touches the winding at the selected position. Increasing the active wire length increases resistance, while reducing the active length lowers resistance and permits more current to flow.

Lab Equipments Ambala publishes comparable Constantine/Eureka-wire and grooved nichrome-wire rheostats. The requested “medium length” designation must be defined by an exact winding length, tube length or overall dimension before production. Resistance value, current capacity and wire alloy must also be selected according to the intended laboratory circuit.

Key Features

• Continuous resistance adjustment: The sliding contact changes resistance smoothly along the winding.
• Medium-length configuration: Intended as an intermediate-size laboratory rheostat; exact dimensional basis [confirm].
• Current-control operation: Can be connected in series with a load within its confirmed electrical ratings.
• Potential-divider capability: A suitable three-terminal arrangement provides adjustable output voltage.
• Wire-wound construction: Compatible product families use Constantine/Eureka or nichrome resistance wire.
• Heat-resistant support: Published rheostat construction uses an insulated porcelain tube.
• Manual laboratory use: Requires no separate power source beyond the experimental circuit.

Technical Specifications

What's Included

• One medium-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 an adjustable voltage through a potential-divider circuit.
• Performing Ohm’s law and current-voltage experiments.
• Protecting meters and sensitive components during circuit setup.
• Adjusting current through lamps, coils and electromagnets.
• Supporting meter-bridge, potentiometer and resistance 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 Medium Length Variable Resistor

1. Switch off the laboratory power supply before connecting the apparatus.
2. For current control, connect one winding-end terminal and the slider terminal in series with the load.
3. Position the slider initially to provide a high resistance.
4. Switch on the suitable low-voltage 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 below the confirmed product ratings.
8. Switch off the supply before changing any connection.

Safety note: The resistance winding and support 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 rheostats, resistance boxes and educational electrical apparatus from Ambala, India. Its published rheostat range includes Constantine/Eureka-wire and nichrome-wire models for current-control and potential-divider experiments. The equipment serves school, college and institutional physics laboratories. Buyers should define the required medium length, resistance, current rating and wire material when requesting a quotation.

Frequently Asked Questions

What is a Medium Length Variable Resistor used for?

It is used to vary resistance, control electrical current and obtain an adjustable voltage in low-voltage laboratory circuits.

What does medium length mean?

The term is not a standardized published dimension for this product. 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 medium-length description 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 supplied apparatus has access to both winding ends and the sliding-contact terminal.

Does the resistor require 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.