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Ohm's Law Apparatus
Ohm's Law Apparatus (Product Code: SCL-337/067) is a pre-wired circuit unit used to verify Ohm's law by measuring the current through an unknown resistance at different voltages in school and college physics laboratories. It combines two moving-coil meters, a 5 V voltmeter and a 500 mA milliammeter, with a wire-wound potentiometer, making it a compact Ohm's law experiment kit for practical classes. It is made by Jain Scientific Equipments Pvt Ltd (ScienceLab), an OEM manufacturer, at its own factory in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Construction | Complete circuit mounted in a wooden box, with the circuit diagram printed on the front panel |
| Meters | Two moving-coil meters for voltage and current: voltmeter 5 V and milliammeter 500 mA (listed as mounted in a spray-painted metal box with terminals) |
| Voltage control | One wire-wound potentiometer |
| Unknown resistance | Two 4 mm socket terminals |
| Supply input | Two 4 mm socket terminals for DC supply |
| Switch | One ON/OFF switch on the front panel |
| Also listed | Step-down transformer and lead wire (ask us to confirm the output voltage) |
| Product code | SCL-337/067 |
| Manufacturer | Jain Scientific Equipments Pvt Ltd (ScienceLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
What Is the Ohm's Law Apparatus Used For?
Students connect a resistor across the unknown-resistance sockets, switch on, and turn the potentiometer to raise the voltage in steps, noting the voltmeter and milliammeter readings each time. A straight-line graph of voltage against current passing through the origin verifies Ohm's law, and its slope gives the resistance.
Because the circuit is already wired and drawn on the front panel, practical time goes into measuring and graphing rather than connecting loose meters, which suits large classes. Keep the current within the 500 mA range, switch off before changing resistors, and use 4 mm leads for secure connections.
What to Specify When Ordering
- Number of units required for your laboratory.
- Whether the step-down transformer and lead wire should be included, and the mains supply available in your laboratory.
- The resistors you plan to test, so the 5 V and 500 mA meter ranges suit them.
OEM Manufacturer
As the original equipment manufacturer, Jain Scientific Equipments Private Limited (trading as ScienceLab) makes and assembles this Ohm's law unit at its own licensed factory at Saha, Ambala, Haryana, India. Because the apparatus comes straight from the factory, colleges and dealers have their quotations and technical questions answered by the people who build it. For a spare meter or replacement potentiometer, ask us. Learn more on the ScienceLab profile.
Related Physics Lab Equipment
To run Ohm's law practicals with different resistors, or to build the circuit from separate parts, consider:
- Carbon Resistance of Different Values — resistors to test across the unknown-resistance sockets.
- Banana Plug Connectors Leads — leads that fit the 4 mm sockets.
- Resistance Box — known resistances for checking the apparatus.
- Rheostat — for building an Ohm's law circuit from separate components.
- Battery Eliminator 12 Volt — a mains-operated DC source for bench circuits.
Explore other current-electricity apparatus in the Physics Lab category.
Frequently Asked Questions
What meters are fitted to the Ohm's Law Apparatus?
The Ohm's Law Apparatus has two moving-coil meters: a 5 V voltmeter and a 500 mA milliammeter, used together to measure the voltage across, and current through, the resistance under test. Keep readings within these ranges to protect the meters.
How is the unknown resistance connected to the Ohm's Law Apparatus?
The Ohm's Law Apparatus provides two 4 mm socket terminals for the unknown resistance and two more for the DC supply. Standard 4 mm banana-plug leads fit both, so resistors can be changed quickly between sets of readings.
Does the Ohm's Law Apparatus need an external power supply?
The Ohm's Law Apparatus has two 4 mm socket terminals for a DC supply, and its listing also mentions a step-down transformer with lead wire. The transformer output is not stated, so please confirm the supply arrangement with us when you request a quotation.
Who manufactures the Ohm's Law Apparatus?
Jain Scientific Equipments Pvt Ltd (ScienceLab) manufactures the Ohm's Law Apparatus as the OEM at its own licensed factory in Saha, Ambala, Haryana, India. Schools, colleges and dealers therefore get pricing, technical answers and repeat orders directly from the maker.
Is a calibration certificate available for the Ohm's Law Apparatus?
A calibration certificate for the meters in the Ohm's Law Apparatus is not part of the standard listing. If your institution needs one, raise it through the contact page before ordering so we can tell you what can be provided.
How does the printed circuit diagram help students?
The circuit diagram printed on the front panel of the Ohm's Law Apparatus shows how the meters, potentiometer and sockets are connected. Students can trace the circuit while taking readings, which helps them draw it correctly in their practical records.
Request a Quote
For the Ohm's Law Apparatus, send your requirement through the contact page or add it to the enquiry cart. Quotations are issued directly by the manufacturer.
Last updated: 24 September 2026
