Rheostat 12 Inches
Product Code : SCL-EAE-11280
Quick answer: The Rheostat 12 Inches is a sliding variable resistor with a nominal 12-inch length. A movable contact on the resistance element sets how much wire is in the circuit, letting students raise or lower current for Ohm's law readings and lamp-brightness demonstrations. Lab Exports manufactures it in Delhi for schools, colleges and universities.
Specifications
| Parameter | Detail |
|---|---|
| Apparatus type | Sliding variable resistor (rheostat) |
| Nominal size | 12 inches |
| Adjustment | Sliding contact moving along the resistance element |
| Primary function | Adjusting resistance and controlling current in a compatible circuit |
The 12-inch figure is the nominal length designation. Resistance value and current rating are not listed here; request them with the quotation.
How the 12-inch rheostat is used in Ohm's law experiments
Resistance of a wire is proportional to its length (R = rho L / A). As the sliding contact moves along the 12-inch element, the length of wire carrying current changes, and so does the circuit resistance. With the supply voltage fixed, a higher resistance gives a lower current, as Ohm's law I = V / R predicts.
- Connect the low-voltage supply, a plug key, an ammeter, the resistor under test and the rheostat in series, and place a voltmeter across the resistor.
- Start with the slider at the maximum-resistance end.
- Close the key and read the ammeter and voltmeter.
- Move the slider a short distance and take the next pair of readings; repeat for five or six positions.
- Plot V against I: a straight line through the origin confirms Ohm's law, and its slope gives the resistance.
The same rheostat can dim and brighten a small lamp in series, a quick way to show how resistance controls current before students move on to quantitative readings.
Key features
- Nominal 12-inch size for a long slider travel
- Sliding contact for smooth change of resistance
- Controls current in low-voltage teaching circuits
- Works with ammeters, voltmeters, keys and lamps for recorded readings
- Slider position gives a visible link between wire length and resistance
- Reusable apparatus for repeated supervised practicals
Documentation and supply
Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the 12-inch rheostat 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
- Sliding Rheostat Dual Tube (SCL-EAE-11279)
- Rheostat 10 Inches (SCL-EAE-11281)
- Resistance Box 100 Ohms (SCL-EAE-11278)
- Rheostat 8 Inches (SCL-EAE-11282)
- Resistance Box 1000 Ohms (SCL-EAE-11277)
- Tapping Key (SCL-EAE-11283)
The full range is in the Electrical and Electronics section of the Physics Lab range.
Frequently asked questions
What does the 12 inches refer to?
It is the nominal length designation of the rheostat. The resistance value and current rating are separate figures; ask for them with the quotation.
Can this rheostat be used for Ohm's law experiments?
Yes. Connected in series with the resistor under test, it varies the current so that several voltage and current readings can be taken and plotted.
What is the price of the 12-inch rheostat?
Prices are not published on the website. Add the 12-inch rheostat to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code SCL-EAE-11280 and the quantity, to receive a quotation.
Does Lab Exports manufacture the 12-inch rheostat?
Yes. Lab Exports manufactures the 12-inch rheostat at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code SCL-EAE-11280.
Request a quote
Email [email protected] with the house code SCL-EAE-11280 and the quantity, or add the 12-inch rheostat to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
