Rheostat 8” (100 ohm 1.6A)
Product Code : SCL-EAE-11189
Quick answer: The Rheostat 8 inch (100 ohm, 1.6 A) is a sliding-contact variable resistor wound on a porcelain tube. It is used in physics practicals to control the current in Ohm's law circuits or, with all three terminals, as a potential divider. Its maximum resistance is 100 ohm and it carries up to 1.6 A. Lab Exports manufactures it in Delhi for schools, colleges and universities.
Specifications
| Parameter | Value |
|---|---|
| Maximum resistance | 100 ohm |
| Maximum current | 1.6 A |
| Tube length | 8 inches (approx. 200 mm) |
| Former | Vitreous enamelled / porcelain ceramic tube |
| Winding | Oxidised resistance wire, closely wound |
| Sliding contact | Spring-loaded phosphor bronze slider on a guide rod |
| Terminals | 3 insulated 4 mm binding posts |
| End supports | Moulded insulated end brackets |
How the rheostat is used
A rheostat changes the resistance in a circuit by moving a sliding contact along a coil of resistance wire. Wired through one end terminal and the slider terminal, it is a two-terminal variable resistor that sets the current. Wired with the supply across both end terminals and the output taken from the slider, it becomes a potential divider that gives a variable voltage from a fixed supply.
- Switch off the supply before wiring the rheostat into the circuit.
- For current control, connect one lower end terminal and the top slider-rod terminal in series with the load.
- For a variable voltage, connect the supply across both lower end terminals and take the output between one end terminal and the slider terminal.
- Set the slider to maximum resistance, switch on, then move the slider slowly while watching the meters.
- Keep the current at or below 1.6 A so the winding does not overheat.
In Ohm's law practicals the rheostat lets students take a series of voltage and current readings for one resistor and plot V against I; the slope gives the resistance. It is also used to vary lamp brightness or small DC motor speed in demonstrations, and as a simple adjustable load on training benches.
Key features
- 100 ohm maximum resistance with a 1.6 A current rating
- 8 inch (approx. 200 mm) porcelain tube former that carries heat away from the winding
- Oxidised wire winding keeps adjacent turns insulated from one another
- Spring-loaded phosphor bronze slider on a guide rod for fine adjustment
- Three insulated 4 mm binding posts for rheostat or potential divider wiring
- Moulded insulated end brackets keep the unit steady on the bench
Documentation and supply
Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the 8 inch rheostat (100 ohm, 1.6 A) 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.
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The full range is in the Electrical and Electronics section of the Physics Lab range.
Frequently asked questions
Can the 8 inch rheostat be used as a potential divider?
Yes. With the supply connected across the two end terminals and the output taken from the slider terminal, it works as a potential divider giving a variable voltage from zero up to the supply voltage.
What happens if the current exceeds 1.6 A?
The winding overheats. Currents above the 1.6 A rating can damage the wire insulation or the resistance element, so start with the slider at maximum resistance and watch the ammeter.
What is the price of the 8 inch rheostat (100 ohm, 1.6 A)?
Prices are not published on the website. Add the 8 inch rheostat (100 ohm, 1.6 A) to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code SCL-EAE-11189 and the quantity, to receive a quotation.
Does Lab Exports manufacture the 8 inch rheostat (100 ohm, 1.6 A)?
Yes. Lab Exports manufactures the 8 inch rheostat (100 ohm, 1.6 A) at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code SCL-EAE-11189.
Request a quote
Email [email protected] with the house code SCL-EAE-11189 and the quantity, or add the 8 inch rheostat (100 ohm, 1.6 A) to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
