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Rheostat 30 Ohm
Rheostat 30 Ohm (Product Code: SCL-349/073) is a sliding-contact variable resistor used to control current or divide voltage in school and college physics circuits. With a total resistance of 30 ohm, it suits low-resistance circuits where current must be adjusted in fine steps, and its three terminals let it work as either a rheostat or a potentiometer. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Total resistance | 30 ohm |
| Sliding contact | Double contact system on a contact block that moves smoothly along the sliding rod |
| Guide rod | Brass guide rod carrying the contact block, tightened with a brass screw |
| Terminals | Three lock-type brass socket terminals with insulation |
| Connections | One terminal to the sliding contact, two to the ends of the winding |
| Markings | Total resistance and maximum current capacity marked on the slider |
| Product code | SCL-349/073 |
| Manufacturer | Jain Scientific Equipments Pvt Ltd (ScienceLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
What Is the 30 Ohm Rheostat Used For?
Connected through one end terminal and the slider terminal, it acts as a variable resistor that sets the current in experiments such as Ohm's law, meter bridge and ammeter calibration. Connected across a supply using both end terminals, with the output taken from the slider, it becomes a potential divider that gives a smoothly variable voltage.
A 30 ohm winding changes resistance in small increments, so it is well matched to low-voltage cell circuits and to the driver circuit of a wire potentiometer. Check the maximum current marked on the slider before connecting, start with the slider at the high-resistance end, and move it gradually. It is a practical rheostat for lab benches in schools and colleges.
What to Specify When Ordering
- Resistance value: this model is 30 ohm; a separate Rheostat model is also listed.
- The current your circuit needs, so it can be checked against the rating marked on the slider.
- Quantity per laboratory.
OEM Manufacturer
ScienceLab, the trading name of Jain Scientific Equipments Private Limited, is the OEM of this 30 ohm rheostat and builds it at its own licensed factory at Saha, Ambala, Haryana, India. Because the maker sells direct, buyers get quotations and repeat supplies from the factory itself instead of a middleman, and can ask it about replacement sliders. More about the company is on the ScienceLab profile page.
Related Physics Lab Equipment
A current-control circuit built around this rheostat typically also uses:
- Rheostat — another rheostat model for circuits needing a different value.
- Ammeter — reads the current being adjusted.
- Battery Eliminator 12 Volt — a DC source for the circuit.
- One Way Key — switches the circuit on only while readings are taken.
Other circuit components are listed in the Physics Lab category.
Frequently Asked Questions
What is the resistance of the Rheostat 30 Ohm?
The Rheostat 30 Ohm has a total resistance of 30 ohm, and this value is marked on its slider together with the maximum current capacity. The low total resistance gives fine control of current in low-voltage student circuits.
Can the Rheostat 30 Ohm be used as a potentiometer?
Yes. The Rheostat 30 Ohm has three lock-type brass terminals: one on the sliding contact and two at the ends of the winding. Connecting both ends across the supply and taking the output from the slider turns it into a potential divider.
What current can the Rheostat 30 Ohm carry?
The maximum current capacity of the Rheostat 30 Ohm is marked on the slider of each unit. The listing does not state the figure, so tell us the current your experiment needs through the contact page and we will confirm suitability before quoting.
Who manufactures the Rheostat 30 Ohm?
The Rheostat 30 Ohm is manufactured by Jain Scientific Equipments Pvt Ltd (ScienceLab), the OEM, at its own licensed factory in Saha, Ambala, Haryana, India. Schools, colleges and dealers order it directly from the manufacturer, which also handles repeat orders.
What does the double contact system on the rheostat do?
The double contact system on the Rheostat 30 Ohm keeps the slider touching the winding at two points as it moves smoothly along the rod. This gives steadier contact, so the current changes evenly instead of flickering while the slider is adjusted.
How should the Rheostat 30 Ohm be cared for?
Keep the Rheostat 30 Ohm dry, avoid running it above the current marked on the slider, and let the winding cool after long use. If the slider feels stiff, clean the brass guide rod with a dry cloth rather than applying oil.
Request a Quote
Ask for the Rheostat 30 Ohm on our contact page or add it to the enquiry cart with your quantity. The manufacturer quotes you directly.
Last updated: 24 September 2026
