Apparatus for Studying f.e.m. and Internal Battery and Battery Resistance
Product Code : SCL-PL-11828
Apparatus for Studying f.e.m. and Internal Battery and Battery Resistance (SKU SCL-PL-11828) is used to find the EMF (f.e.m.) and internal resistance of a battery from voltmeter and ammeter readings taken as a rheostat changes the load. It includes three cells, digital meters and a switch. It suits Class 12 physics and B.Sc. electricity labs. Science Lab Supplies, a manufacturer based at Plot 448, HSIIDC Industrial Area, Saha, Ambala, India, makes the set and supplies it direct to schools, colleges, tender contractors and distributors.
Specifications
Three 3–4.5 V cells in their boxes feed a circuit with a digital ammeter, a digital voltmeter, a rheostat and a DC power switch rated 36 V and 0–3 A. Six pairs of leads with red and blue connectors join the parts, and a demonstration table accompanies the set.
| Parameter | Value |
|---|---|
| SKU | SCL-PL-11828 |
| Also known as | EMF and internal resistance apparatus |
| Cells | 3 batteries, 3–4.5 V, with boxes |
| Meters | Digital ammeter; digital voltmeter |
| Load control | Rheostat |
| Switch | Power switch, 36 V DC, 0–3 A |
| Leads | 6 pairs with red and blue connectors |
| Also included | Experiment demonstration table |
| Manufacturer | Science Lab Supplies, Saha, Ambala, Haryana |
| Country of origin | India |
Applications and Experiments for the EMF and Internal Resistance Apparatus
As the rheostat draws more current, the terminal voltage of a real cell falls; plotting voltage against current gives the EMF as the intercept and the internal resistance as the slope. The set covers this topic of NCERT Class 12 physics and the matching B.Sc. and diploma practicals.
- Class 12 physics (Current Electricity): EMF, terminal voltage and internal resistance of a cell.
- Plotting the V–I graph and reading EMF and internal resistance from it.
- Comparing single cells with cells joined in series.
Standard Scope of Supply
The set is delivered with three 3–4.5 V batteries and their boxes, a digital ammeter, a digital voltmeter, a rheostat, six pairs of leads with red and blue connectors, a DC power switch and the experiment demonstration table. Any optional extras are listed separately on the quotation.
Packing, MOQ and Lead Time
Science Lab Supplies prepares quotations for anything from one set to a full Class 12 lab, and each one confirms the packing, delivery time and price for the quantity chosen. A potentiometer kit for the alternative method can be quoted on the same page.
Science Lab Supplies is registered as an exporter with an Importer-Exporter Code and is able to ship to buyers in South Africa, Qatar, Sri Lanka, Vietnam, Malaysia and Peru. The business is registered under Udyam as a manufacturing enterprise (UDYAM-HR-01-0014546) and for GST (GSTIN 06ADEPJ0574F2ZU). Get in touch using the contact page or enquiry cart; the lab tender page is for tender buyers.
Frequently Asked Questions
What does f.e.m. mean in the product name?
F.e.m. is the French and Spanish abbreviation for electromotive force, so this is an EMF and internal resistance apparatus for measuring a battery's EMF and the resistance inside it.
How is internal resistance found with this set?
Students record terminal voltage and current at several rheostat settings, plot voltage against current, and take the EMF from the intercept and the internal resistance from the slope.
Is Science Lab Supplies the manufacturer or a trader?
The company manufactures the apparatus rather than trading it. It is made in Saha, Ambala, India, and the factory sends the quotation, so buyers work with the producer directly.
Related Current Electricity Kits
Internal resistance can also be measured with a potentiometer, and it builds on earlier work with circuits and resistance. These four Physics Lab items cover those steps and a spare rheostat, and every one of them can be quoted together with this apparatus.
- Potentiometer Kit — internal resistance by the null method with a Daniell-type cell.
- Series and Parallel Connections Apparatus — bulbs, cells and rheostat on a magnetic board.
- Resistance Factors Apparatus — copper and iron test wires with meters.
- Rheostat — 10 Ω high-power rheostat with 4 mm safety sockets.
Browse the full Physics Lab range or all physics lab equipment.
Last updated: 25 September 2026
