Demonstration Transformer Manufacturer,Supplier and Exporter in India
Product Code : EL-SLE-4745
Jlab Export is a leading Demonstration Transformer Manufacturer,and suppliers in India
Demonstration Transformer (code EL-SLE-4745) is a teaching transformer used to explain the fundamentals of transformers in school and college physics classes. It has one main coil, fitted with an electric cord and plug, and three secondary coils that are used one at a time, each with 4 mm socket terminals for meters or a lamp. It is made by Jain Laboratory Instruments Pvt Ltd (JLab) at its works in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Purpose | Demonstrating the fundamentals of transformers |
| Main (primary) coil | One, with electric cord and plug |
| Secondary coils | Three, used one at a time |
| Secondary terminals | 4 mm sockets |
| Quality check | Each transformer is visually inspected before dispatch |
| Pack quantity | Each (sold individually) |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 7–10 working days |
| Product code | EL-SLE-4745 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
How Does It Compare with Other JLab Teaching Transformers?
| Model | Primary | Secondary coils |
|---|---|---|
| This demonstration transformer (EL-SLE-4745) | One main coil with cord and plug | Three, used one at a time; 4 mm sockets |
| Demountable Transformer | One mains coil, 240 V, 50 Hz, 2400 turns | Two interchangeable coils of 65 and 130 turns, giving about 6 V and 12 V at up to 2 A |
| Transformer | One mains coil, 240 V, 50 Hz | Interchangeable coils listed with 200, 800 and 400 turns |
Choose this model when you want three secondary coils to compare during one lesson. The demountable transformer and the interchangeable-coil transformer list their turns and voltages, which helps if your practical sheet needs known turns ratios.
What Is the Demonstration Transformer Used For?
A transformer changes the voltage of an alternating supply. Alternating current in the main coil sets up a changing magnetic field in the core, and that changing field induces a voltage in whichever secondary coil is fitted — mutual induction. The ratio of secondary to primary voltage equals the ratio of the numbers of turns on the two coils, so a secondary with fewer turns steps the voltage down and one with more turns steps it up. Swapping between the three secondary coils lets students see how the output changes with the coil, and connecting a lamp or an AC meter to the 4 mm sockets makes the change visible. The topic is taught in the class 12 chapters on electromagnetic induction and alternating current, and the apparatus is also used in college and polytechnic electrical classes.
Because the main coil plugs into the mains, the demonstration should be set up and switched by the teacher. Check the cord and plug before each use, switch off and unplug before changing the secondary coil, and never touch the terminals while the supply is on. A transformer only works with alternating current: a steady DC supply gives no continuous output.
What to Specify When Ordering
- Mains supply — your supply voltage, frequency and plug type, especially for export orders.
- Coil details — if your syllabus needs particular turns or output voltages, list them so JLab can confirm what the three secondary coils provide.
- Quantity — the minimum order is 10 units.
- Meters — AC ammeters or voltmeters for measuring the output can be added to the same enquiry.
Frequently Asked Questions
What does the demonstration transformer consist of?
One main coil with an electric cord and plug, and three secondary coils used one at a time, each with 4 mm socket terminals.
What output voltages do the secondary coils give?
The listing does not state the turns or output voltages. Ask JLab for them with your quotation; the output of each coil depends on its turns compared with the main coil.
Can it be run from a DC supply or battery?
No. A transformer needs alternating current, because only a changing magnetic field induces a voltage in the secondary coil.
Is it safe for students to use?
The main coil connects to the mains through its cord and plug, so a teacher should set it up and switch it. Once the output voltages are confirmed, students can take readings from the secondary sockets under supervision.
What should I connect to the 4 mm sockets?
Leads with 4 mm plugs to a small lamp, or to an AC voltmeter or ammeter, to show and measure the induced output.
What should an export enquiry include?
The quantity, destination country and port or city, mains voltage and plug type, delivery terms such as FOB or CIF, packing or labelling needs, and any tender reference.
Who manufactures this demonstration transformer?
Jain Laboratory Instruments Pvt Ltd (JLab), at its works in Ambala, Haryana, India.
OEM Manufacturer
JLab is the trading name of Jain Laboratory Instruments Pvt Ltd, a manufacturer of physics demonstration and electrical teaching apparatus in India, incorporated in 2017 and based on Hargolal Road, Ambala, Haryana. The demonstration transformer is built at JLab’s own works rather than bought from a trader, so schools, colleges, dealers and importers buy it factory-direct; each unit is visually inspected before dispatch, and repeat orders are handled by the manufacturer. JLab exports worldwide and ships to buyers in every region — for example Serbia in Southern Europe, Algeria in North Africa, Oman in the Middle East, Mozambique in East Africa and Mexico in North America. Tender buyers can find details on the JLab lab tenders page.
Related Electromagnetism Apparatus
- Induction Coil — produces a high voltage from a low-voltage DC supply to demonstrate mutual induction.
- Ammeter AC — measures the RMS value of alternating current in the secondary circuit.
- Electromagnetic Induction — a wall chart explaining how a changing magnetic field produces a current, the principle behind transformers.
- Demountable Transformer — a mains transformer with two interchangeable secondary coils.
More school physics apparatus is in the School Lab Equipment range.
Request a Quote
Quotes come direct from the manufacturer. Use the Add To Cart enquiry button on this page, or send the quantity (minimum 10 units), your mains voltage and plug type, any meters you want with it, and your delivery location through the contact page.
Last updated: 4 October 2026
