Ohms Law Apparatus
Product Code : SCL-EAE-11337
Quick answer: The Ohms Law Apparatus is a self-contained set for verifying Ohm's law: a step-down transformer supply with 1.5, 3 and 4.5 V settings, a 5 V moving-coil voltmeter, a 500 mA milliammeter and a wire-wound potentiometer, all in a metal box with 4 mm sockets for the unknown resistance. Lab Exports manufactures it in Delhi for schools, colleges and universities.
Specifications
| Component | Specification |
|---|---|
| Voltmeter | Moving-coil meter, 5 V range |
| Milliammeter | Moving-coil meter, 500 mA range |
| Supply settings | 1.5 V, 3 V and 4.5 V |
| Power component | Step-down transformer |
| Variable component | One wire-wound potentiometer |
| Connections | 4 mm socket terminals for the supply and unknown resistance |
| Enclosure | Spray-painted metal box |
| Front panel | ON/OFF switch and printed circuit diagram |
How the Ohm's law experiment is done
Ohm's law says that the current I through a resistor is proportional to the potential difference V across it, so that V/I = R stays constant at a steady temperature. This apparatus puts every part needed to test that statement into one metal box: the low-voltage supply, a 5 V voltmeter across the resistor, a 500 mA milliammeter in series with it and a wire-wound potentiometer to vary the current.
With three supply settings and the potentiometer, students can take a wide spread of readings from one resistor, then repeat with a second unknown resistance plugged into the 4 mm sockets and compare the two straight-line graphs.
- Keep the ON/OFF switch off and connect the unknown resistance to the 4 mm sockets as shown by the printed circuit diagram.
- Select the 1.5 V supply setting and switch on.
- Adjust the potentiometer in steps, recording the voltmeter and milliammeter readings each time.
- Repeat on the 3 V and 4.5 V settings, keeping the current within the 500 mA meter range.
- Switch off, plot V against I and find R from the gradient.
Key features
- Moving-coil voltmeter with a 5 V range
- Moving-coil milliammeter reading up to 500 mA
- Selectable supply settings of 1.5 V, 3 V and 4.5 V from a step-down transformer
- Wire-wound potentiometer for fine control of the circuit
- Front-panel printed circuit diagram and ON/OFF switch
- Spray-painted metal box with 4 mm socket terminals
Documentation and supply
Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the Ohms Law Apparatus 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
What meters are fitted to the Ohms law apparatus?
A moving-coil voltmeter with a 5 V range and a moving-coil milliammeter with a 500 mA range.
What supply voltages does the apparatus provide?
Three settings, 1.5 V, 3 V and 4.5 V, from its step-down transformer arrangement.
What is the price of the Ohms Law Apparatus?
Prices are not published on the website. Add the Ohms Law Apparatus to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code SCL-EAE-11337 and the quantity, to receive a quotation.
Does Lab Exports manufacture the Ohms Law Apparatus?
Yes. Lab Exports manufactures the Ohms Law Apparatus at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code SCL-EAE-11337.
Request a quote
Email [email protected] with the house code SCL-EAE-11337 and the quantity, or add the Ohms Law Apparatus to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
