Resistance Box Plug Type
Product Code : EL-EAE-10282
Quick answer: The Resistance Box Plug Type provides known resistances for circuit and bridge experiments: removing a brass plug brings its coil into circuit. Coils are double-covered constantan or manganin wire on Bakelite spools under a non-inductive brass block in a wood box, with accuracy from ±0.02% to ±0.1%. Lab Exports manufactures it in Delhi for schools, colleges and universities.
Specifications
| Item | Specification |
|---|---|
| Block | 12 mm / 10 mm thick rectangular brass, non-inductive |
| Winding | Double-covered Eureka constantan wire or constantan wire, on Bakelite spool |
| Housing | Wood box |
| Accuracy, constantan coils | ±0.05% to ±0.1% |
| Accuracy, manganin coils | ±0.02% to ±0.05% |
How it is used
Each resistance coil is connected between two neighbouring sections of the brass block. With a plug pushed into the gap between the sections, current passes through the brass and the coil is short-circuited; pulling the plug out forces the current through the coil. The resistance between the terminals is therefore the sum of the coils whose plugs have been removed.
Constantan and manganin are used for the coils because their resistance changes very little with temperature, so the box keeps its stated value as it warms during use. The box serves as the known resistance in Ohm's law verification, meter bridge and potentiometer experiments, and in the calibration of ammeters and voltmeters.
- Check that all plugs are clean and pushed firmly home, so the box reads zero.
- Connect the box into the circuit through its terminals.
- Remove the plugs whose values add up to the resistance required.
- After the reading, replace the plugs with a slight twist to keep contact resistance low.
Key features
- Constantan (Eureka) or manganin coils with a low temperature coefficient
- Accuracy of ±0.05% to ±0.1% for constantan and ±0.02% to ±0.05% for manganin
- Double-covered wire wound on Bakelite spools for insulation and durability
- Thick rectangular brass block, non-inductive, for low-resistance plug contacts
- Enclosed in a wood box for bench use
Documentation and supply
Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the plug type resistance box at its works in Laxmi Nagar, Delhi, and supplies it to schools, colleges and universities in India and 60+ countries, handling the export documents for each shipment. More about the company is on the About Lab Exports page.
Related Electrical and Electronics products
- Resistance Substitution Box (EL-EAE-10283)
- Decade Resistance Box, Dial Type (EL-EAE-10284)
- Post Office Box Plug Type (EL-EAE-10285)
- Resistance Box Electronic Type (EL-EAE-10286)
- Rheostat Constantine (Eureka) Wire (EL-EAE-10287)
- Rheostat Nichrome Wire Groove Type (EL-EAE-10288)
The full range is in the Electrical and Electronics section of the Physics Lab range.
Frequently asked questions
What is the accuracy of the plug type resistance box?
±0.05% to ±0.1% with constantan coils, and ±0.02% to ±0.05% with manganin coils.
How is a resistance taken out of a plug type box?
Remove the plug across the coil required. With the plug in, the coil is shorted out; with the plug removed, its resistance is added to the circuit.
What is the price of the plug type resistance box?
Prices are not published on the website. Add the plug type resistance box to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code EL-EAE-10282 and the quantity, to receive a quotation.
Does Lab Exports manufacture the plug type resistance box?
Yes. Lab Exports manufactures the plug type resistance box at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code EL-EAE-10282.
Request a quote
Email [email protected] with the house code EL-EAE-10282 and the quantity, or add the plug type resistance box to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
