Resistance Box Manufacturer,Supplier and Exporter in India
Product Code : EL-PL-12411
Jlab Export is a leading Resistance Box Manufacturer,and suppliers in India
Resistance Box (code EL-PL-12411) is a plug-type resistance box with constantan coils under 1/2 inch brass blocks in a teak wood case, giving values from 1 to 1000 ohm. It provides known resistances for bridge, potentiometer and Ohm’s law practicals. The box is made by JLab at Ambala in India.
Specifications
| Parameter | Detail |
|---|---|
| Model | JL345/071 |
| Type | Plug type, brass plugs |
| Range | 1 to 1000 ohm |
| Coils | Constantan |
| Blocks | 1/2 inch brass blocks |
| Case | Teak wood |
| Quality check | Each resistance box is visually inspected before dispatch |
| Pack quantity | Each (sold individually) |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 4–6 working days |
| Product code | EL-PL-12411 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
How the Plugs Set a Value
Each coil is connected between two neighbouring brass blocks. With its plug in place, current takes the low-resistance path through the brass and the coil adds nothing; pulling the plug out puts that coil into the circuit. The resistance between the terminals is therefore the total of the coils whose plugs have been removed, and with every plug in, the box reads close to zero. Constantan is used for the coils because its resistance changes very little as it warms.
Looking After the Plugs
Seat each plug with a slight twist so the taper makes firm contact all round; a loose or tarnished plug adds contact resistance, which shows most at the low settings. Keep the plugs and blocks clean and dry, and put every plug back into its hole after use so none goes missing.
Related Electricity Apparatus
- Resistance Box 1-5000 Ohm Range — same plug-type build with a range up to 5000 ohm.
- Meter Bridge — slide wire where this box supplies the known resistance.
- Potentiometer, 10 wire — the box can shunt a cell to find its internal resistance.
Rheostats, keys and meters to complete the circuit are in Physics Lab.
Request a Quote
Use Add To Cart or send us a note through the contact page, with how many boxes you need, model JL345/071 and the place of delivery.
Last updated: 26 October 2026
