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Resistance Substitution Box
Resistance Substitution Box (Product Code: SLE/EAM/07) is a robust resistance box for the physics lab that lets students build any value from 1 to 12,221 Ω by linking its internal resistors in series through 4 mm sockets. A printed connection diagram on the panel shows exactly which sockets to join, so the box works equally well as a known resistor, a variable load or a stand-in for an unknown component. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Resistance range | 1 to 12,221 Ω |
| Selection method | Resistors selected with 4 mm sockets and arranged in series |
| Power rating | 2 W |
| Panel | Clear connection diagram on the main panel |
| Construction | Robust box design |
Typical Use
The name describes its classic job: the substitution method. Students measure the current through an unknown resistor, swap the box into its place and adjust the selected value until the meter shows the same reading; the box setting then equals the unknown resistance. The same box serves as the known arm when balancing Wheatstone bridge experiments, as a stepped load for plotting current against voltage, and as a series resistor when a lamp or LED needs its current limiting.
Because every resistance is made by joining sockets rather than turning a dial, the circuit on the panel matches the circuit diagram in the notebook, which helps students connect the idea of resistors adding in series with a real measurement. Keep an eye on the 2 W rating: at low resistance settings, a higher supply voltage can push the dissipated power up quickly, so check the expected current before switching on and start at a modest voltage.
Manufacturer
This box is built by Jain Scientific Equipments Private Limited, which trades as ScienceLab from Ambala, Haryana, and is a registered MSME manufacturer (Udyam UDYAM-HR-01-0003714); export consignments are shipped under Importer-Exporter Code AAECJ8618A issued by the DGFT. Visit the company profile to learn more about ScienceLab.
Related Electricity and Magnetism Equipment
To wire the box into a measuring circuit, buyers commonly add:
- Stackable Leads — 4 mm leads for linking the sockets and connecting the box to the circuit.
- Digital Ammeter — provides the matching current reading at the heart of the substitution method.
- Digital Voltmeter — measures the potential difference across the selected resistance.
- Wheatstone Bridge Four Gap — the box can act as the known resistance when balancing the bridge.
- Decade Resistance Box — an alternative style of resistance box for labs comparing formats.
Explore more circuit apparatus in the Electricity and Magnetism category.
Frequently Asked Questions
What resistance values can I set?
Any value from 1 to 12,221 Ω that the internal resistors can make when connected in series, chosen by linking the 4 mm sockets as shown on the panel diagram.
How much power can the box handle?
It is rated at 2 W. Work out the expected power before connecting, especially when a low resistance is selected with a higher supply voltage.
What leads does it take?
Connections are made through 4 mm sockets, so standard 4 mm plug leads are used both to link resistors and to connect the box into a circuit.
What is the tolerance of the resistors?
The tolerance is not listed on this page. If your practical needs a specific tolerance, please check with us through the contact page before ordering.
Is a calibration certificate available?
Certificate availability depends on the order, so please discuss it with us when you request a quote.
What should our purchase enquiry include?
Give the quantity, the delivery location and any tender or vendor-registration paperwork you need; we supply schools, colleges and distributors in India and international markets.
Request a Quote
Ask for pricing on the Resistance Substitution Box through our contact page, or collect it in the enquiry cart with meters and leads for one quotation.
Last updated: 24 September 2026
