Ohms Law Apparatus
Product Code : LSK-LM-11126
Ohms Law Apparatus (SKU LSK-LM-11126) is a self-contained panel unit for studying and verifying Ohm’s law, with a 5 V moving-coil voltmeter, a 500 mA moving-coil milliammeter and a wire-wound potentiometer in a spray-painted metal box. The circuit diagram is printed on the front panel, and 4 mm sockets take the unknown resistance and the DC supply. Science Lab Supplies supplies it from Ambala, India for schools, colleges, training institutes, tender contractors and distributors, in 1.5 V, 3 V and 4.5 V versions.
Specifications
All details given for the apparatus are listed in the table below. In short, two moving-coil meters read voltage and current, a wire-wound potentiometer varies the voltage, separate pairs of 4 mm sockets connect the unknown resistance and the DC supply, and a step-down transformer and lead wire come with it.
| Specification | Value |
|---|---|
| SKU | LSK-LM-11126 |
| Purpose | Study and verification of Ohm’s law |
| Voltmeter | Sensitive moving-coil voltmeter, 5 V |
| Current meter | Moving-coil milliammeter, 500 mA |
| Potentiometer | One wire-wound potentiometer |
| Unknown resistance connection | Two 4 mm socket terminals |
| DC supply connection | Two 4 mm socket terminals |
| Additional terminal | One dial-type terminal |
| Switch | ON/OFF switch on the front panel |
| Front panel | Circuit diagram printed on the panel |
| Housing | Spray-painted metal box with terminals |
| Voltage versions | 1.5 V, 3 V and 4.5 V |
| Power source | Step-down transformer supplied |
| Leads | Lead wire supplied |
| Supplied by | Science Lab Supplies, Ambala, India |
Applications and Experiments for the Ohms Law Apparatus
Students connect a resistor to the sockets, vary the voltage with the potentiometer and record pairs of voltmeter and milliammeter readings, then plot V against I to show a straight line and find the resistance. It is core school physics lab equipment in India and suits college and vocational practicals.
- Class 10 science (Electricity): verifying Ohm’s law and finding resistance from the V–I graph, using coils from a Resistance Box Plug Type (Constantan / Manganin Coil).
- Class 11–12 physics: comparing resistors in series and parallel, with values set on a Decade Resistance Box, Dial Type.
- B.Sc. and diploma labs: checking whether a component obeys Ohm’s law.
- ITI electrician and electronics trades: basic V–I measurement practice.
Switch off before changing the resistor, and keep the current within the 500 mA milliammeter and the voltage within the 5 V voltmeter.
Standard Scope of Supply
Each Ohms Law Apparatus is supplied as the metal-box unit with its two meters, potentiometer, switch and sockets, together with a step-down transformer and lead wire. Choose the 1.5 V, 3 V or 4.5 V version; resistors or resistance boxes for testing are quoted separately.
Packing, MOQ and Lead Time
Quotations can be made for one apparatus for a demonstration or one per bench for a class practical. Science Lab Supplies states packing, delivery time and price for that quantity, and resistance boxes or extra leads can be added to the same quotation.
Holding an Importer-Exporter Code, Science Lab Supplies is able to ship to buyers in Sri Lanka, Vietnam, Malaysia, Peru, Egypt and Iraq. Reach the team on the contact page or via the enquiry cart; for tender quantities, the lab tender page explains the process.
Frequently Asked Questions
What experiment is the Ohms Law Apparatus used for?
It is used to show that the current through a resistor is proportional to the voltage across it. Students take several voltage and current readings, plot the graph and calculate the resistance from its slope.
What meters are built into the panel?
Two moving-coil meters are fitted: a sensitive voltmeter reading up to 5 V and a milliammeter reading up to 500 mA, with a wire-wound potentiometer to vary the applied voltage.
Which voltage versions are available?
The apparatus is available in 1.5 V, 3 V and 4.5 V versions, and each is supplied with a step-down transformer and lead wire. State the version you need on your enquiry.
Who supplies the Ohms Law Apparatus?
Science Lab Supplies supplies this apparatus from Ambala, India, and can include resistance boxes, meters and other electricity apparatus for the same practicals on one quotation.
Related Ohm’s Law and Circuit Apparatus
These items offer alternative Ohm’s law setups or support the same practical: a kit with built-in supply, a digital version, separate bench meters, an ohmmeter for checking resistors, an electronic resistance box, a student circuit board and a meter bridge. All can be quoted together.
- Ohms Law kit Apparatus — self-contained kit with a built-in variable DC supply and analog meters.
- Digital Ohms Law Apparatus 5 watts — 100 Ω, 5 W resistance with 0–10 V DC and 100 mA measurement.
- Ammeter — DC meter on a Bakelite or acrylic stand in all common ranges.
- Voltmeter — DC voltmeter with lock-type terminals in all common ranges.
- Digital Ohmmeter 20KΩ — digital resistance readings up to 20 kΩ.
- Resistance Box Electronic Type — versions from 50 Ω and 100 Ω up to 1000 Ω.
- Junior Circuit Board — 3 V DC board with cell holder, switch, fan, fuse and bulb holder.
Browse the full Lab Meters range, the Electrical and Electronics range for resistance boxes and rheostats, or all physics lab equipment.
Last updated: 9 October 2026
