Electrical Resistance Coil Unit

Product Code : SCL-EAE-11256

The Electrical Resistance Coil Unit is a fixed-resistance laboratory component used for Ohm’s law, current–voltage, series and parallel circuit, and resistance-measurement experiments. It provides students and teachers with a convenient resistive load that can be connected to supervised low-voltage physics and electronics circuits.

Product Description

The unit contains resistance wire wound on or around an electrically insulating support and connected to accessible terminals. The winding converts electrical energy into heat while limiting current according to its resistance value and circuit conditions.

Resistance coil units can be connected individually or combined to demonstrate equivalent resistance in series and parallel networks. The resistance value, winding alloy, tolerance and permissible power determine the unit’s correct application and must be confirmed for the supplied model.

Key Features

• Fixed resistance element: Provides a defined resistance value when verified for the supplied unit.
• Laboratory terminals: Supports convenient connection to low-voltage educational circuits.
• Wound-coil construction: Places a practical wire length within a compact component.
• Reusable apparatus: Suitable for repeated circuit experiments within its confirmed ratings.
• Series and parallel use: Multiple units can demonstrate changes in equivalent resistance.
• Hands-on learning: Supports measurements of voltage, current and resistance.
• Passive operation: Requires no separate battery within the unit.
• Educational format: Suitable for classroom demonstrations and student practical work.

Technical Specifications

What's Included in the Kit

• 1 × electrical resistance coil unit

A power supply, ammeter, voltmeter, switch, connecting leads and additional resistance units are not included unless specifically stated.

Applications / Uses

• Verifying the relationship between voltage and current.
• Determining resistance from measured voltage and current.
• Comparing equivalent resistance in series and parallel circuits.
• Investigating voltage division across series resistances.
• Investigating current division in parallel branches.
• Supporting Kirchhoff’s current and voltage law experiments.
• Comparing an unknown resistance with a plug-type resistance box.
• Conducting bridge measurements with a meter bridge or Wheatstone bridge.

How to Use the Electrical Resistance Coil Unit

1. Confirm the unit’s resistance, current, voltage and power ratings.
2. Inspect the terminals, housing and winding for visible damage.
3. Keep the laboratory power supply switched off while wiring the circuit.
4. Connect the coil unit with an ammeter in series.
5. Connect a voltmeter across the resistance unit when required.
6. Set the power supply to its minimum output before switching it on.
7. Increase the voltage gradually while monitoring current and heating.
8. Record the voltage and current readings at each selected setting.
9. Switch off the supply before changing any circuit connection.

Safety note: Do not connect the unit directly to mains electricity. Exceeding its current or power rating can overheat the coil, damage insulation and create a burn hazard.

Care & Maintenance

• Store the unit in a clean, dry cabinet.
• Keep the terminals free from corrosion and loose connections.
• Allow the coil to cool before handling or storage.
• Do not use a unit with a cracked housing, exposed winding or unstable resistance.

Why Choose Lab Equipments Ambala

Lab Equipments Ambala manufactures and exports scientific and educational laboratory equipment from Ambala, India. Its range includes resistance apparatus, rheostats, meter bridges and electrical circuit instruments. The company supports institutional procurement and international laboratory supply. Buyers should confirm all electrical ratings and included components before ordering.

Frequently Asked Questions

What is an Electrical Resistance Coil Unit used for?

It is used as a fixed resistive component in Ohm’s law, circuit-network and electrical resistance experiments.

What resistance value does the unit provide?

The nominal resistance is model-specific and must be confirmed from the product label or technical specification.

Can multiple coil units be connected together?

Yes. Compatible units can be connected in series or parallel, provided every unit remains within its electrical and thermal ratings.

What material is used for the resistance winding?

The winding may use a resistance alloy such as Constantan, Manganin or Nichrome, but the supplied material must be confirmed.

Why does the resistance coil become warm?

Current passing through the resistance converts electrical energy into heat. Excessive heating indicates that the operating limits may be exceeded.

Can it be connected directly to mains electricity?

No. Use the unit only with a suitable current-limited, low-voltage laboratory power supply under qualified supervision.

Browse the complete electrical and electronics laboratory equipment range or explore related physics laboratory apparatus from Lab Equipments Ambala.