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Eddy Current Unit 120 mm
Eddy Current Unit 120 mm (Product Code: SCI-1529/013) is a physics demonstration apparatus used to show how eddy currents induced in a moving conductor oppose its motion in electromagnetism lessons. Its 120 mm aluminium disc has a 20 mm driving pulley for the hand-wheel driving unit, and powerful circular magnets on a pivoted arm swing over or away from the disc, giving a clear electromagnetic induction demonstration. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Purpose | Demonstration of eddy currents |
| Disc | Aluminium, 120 mm diameter |
| Driving pulley on disc | 20 mm |
| Magnets | Powerful circular magnets |
| Magnet mounting | Pivoted arm, so the magnets can be moved over or away from the disc as required |
| Drive | Used in conjunction with the hand-wheel driving unit |
| Product code | SCI-1529/013 |
| Manufacturer | Jain Scientific Equipments Pvt Ltd (ScienceLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
What Is the Eddy Current Unit Used For?
With the magnets swung away, a few turns of the hand wheel set the aluminium disc spinning and it coasts for a while. Swing the magnets over the disc and it slows down sharply: the changing magnetic field induces circulating (eddy) currents in the aluminium, and by Lenz's law those currents create a field that opposes the motion. Students can also feel the hand wheel become harder to turn when the magnets are in place, which links the effect to energy being converted into heat in the disc.
Because aluminium is not attracted to a magnet, the demonstration makes clear that the braking comes from induction, not ordinary magnetic attraction. Teachers use it to introduce real applications such as eddy current brakes, induction meters and the damping of moving-coil instruments. Keep the magnets away from phones, watches and cards, and check that the belt runs straight before each lesson.
What to Specify When Ordering
- Whether you also need the Hand-Wheel Driving Unit, which the unit is designed to be used with.
- The number of units, for a demonstration bench or several student groups.
- Whether a drive belt should be included, as it is not mentioned in the listing.
OEM Manufacturer
The Eddy Current Unit 120 mm comes from Jain Scientific Equipments Private Limited, trading as ScienceLab, which is its OEM (original equipment manufacturer). It is built at the company's own licensed factory at Saha, Ambala, Haryana, India, so schools, colleges, dealers and importers can order the disc unit and its matching hand-wheel drive from one maker, factory-direct. For repeat orders or replacement parts, ask us. More about the company is on the ScienceLab profile page.
Related Laboratory Equipment
Apparatus that completes or extends the eddy current demonstration:
- Hand-Wheel Driving Unit — the hand-turned drive the disc is designed to work with.
- Eddy Current Unit — another eddy current apparatus from our physics range.
- Induced Current Apparatus — for follow-up experiments on electromagnetic induction.
- Steel Horseshoe Magnet — shows students beforehand that aluminium is not attracted by a magnet.
Browse the Laboratory Equipment category for more demonstration apparatus.
Frequently Asked Questions
How does the Eddy Current Unit 120 mm demonstrate eddy currents?
In the Eddy Current Unit 120 mm, an aluminium disc is spun and the magnets are then swung over it. The disc slows sharply because currents induced in the aluminium produce a magnetic field that opposes the motion, a direct illustration of Lenz's law.
What drives the Eddy Current Unit 120 mm?
The Eddy Current Unit 120 mm is designed to be used with the hand-wheel driving unit. The disc carries a 20 mm driving pulley, so turning the hand wheel spins the disc quickly enough for the braking effect to be clearly seen.
Why is the disc of the Eddy Current Unit 120 mm made of aluminium?
The 120 mm disc of the Eddy Current Unit is aluminium because it conducts electricity well but is not attracted to magnets. Any braking students see therefore comes from induced eddy currents rather than from ordinary magnetic attraction.
Can the magnets on the Eddy Current Unit 120 mm be moved?
Yes. The powerful circular magnets of the Eddy Current Unit 120 mm are carried on a pivoted arm, so they can be moved over the disc or away from it as required, letting students compare free spinning with magnetic braking.
Who manufactures the Eddy Current Unit 120 mm?
The Eddy Current Unit 120 mm is manufactured by Jain Scientific Equipments Pvt Ltd (ScienceLab), the OEM, at its own licensed factory at Saha, Ambala, Haryana, India. Buyers order it, and its matching hand-wheel drive, directly from the manufacturer.
What should I include when requesting a quote for the Eddy Current Unit 120 mm?
When requesting a quote for the Eddy Current Unit 120 mm, give the product code SCI-1529/013, the quantity, the delivery location and whether you also need the hand-wheel driving unit. We supply institutions in India and international markets.
Request a Quote
Get a quotation for the Eddy Current Unit 120 mm (SCI-1529/013) through the contact page or by adding it to the enquiry cart. Quotations are issued directly by the manufacturer.
Last updated: 24 September 2026
