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. Production takes place at the Science Lab Supplies factory, Plot 448, HSIIDC Industrial Area, Saha, Ambala, India, which manufactures the set and quotes schools, colleges, tender contractors and distributors directly.
Specifications
For the EMF and internal resistance set, each part and rating is entered separately in the table. In short, three 3–4.5 V cells in their boxes feed a circuit with a digital ammeter, a digital voltmeter, a rheostat and a 36 V, 0–3 A DC power switch, joined by six pairs of leads, with a demonstration table.
| Specification | Value |
|---|---|
| SKU | SCL-PL-11828 |
| Also known as | EMF and internal resistance apparatus |
| Batteries | 3 |
| Battery voltage | 3–4.5 V |
| Battery boxes | One per battery |
| Ammeter | Digital |
| Voltmeter | Digital |
| Load control | Rheostat |
| Conductor wires | 6 pairs |
| Connector colours | Red and blue |
| Power switch rating | 36 V DC, 0–3 A |
| Demonstration table | 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; a Knife Switch can open the circuit between readings.
- Plotting the V–I graph and reading EMF and internal resistance from it.
- Comparing single cells with cells joined in series, with open-circuit voltages cross-checked on a Digital Multimeter.
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). Pricing for one set or a full practical batch starts with a note on the contact page or a list in the enquiry cart; tendered purchases are explained on the lab tender page.
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 can 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?
An EMF set ordered here is built by Science Lab Supplies itself at its Saha, Ambala factory in India, and the quotation is drawn up there too, so buyers work with the producer rather than a trader.
Related Current Electricity Equipment
Internal resistance can also be measured with a potentiometer, and it builds on earlier work with circuits and resistance. These Physics Lab and Electrical and Electronics items cover those steps, spare cell holders and rheostats and a wall poster, and every one of them can be quoted together with this apparatus.
- Potentiometer Kit — galvanometer at 20 µA per division with a five-decade resistance box.
- Apparatus for Studying Circuits for Series and Parallel Connections — three bulbs and six pairs of 25 cm leads on a magnetic board.
- Apparatus for Studying the Dependence of Electrical Resistance on the Factors that Determine it — 24 and 30 SWG test wires with a 2–14 V AC/DC supply.
- Rheostat — 320 W continuous, 640 W for 15 minutes, with 4 mm safety sockets.
- Rheostat Nichrome Wire Groove Type — porcelain pipe and three brass terminals, for variable resistance or potential division.
- Cell Holder — 1.5, 3, 4.5 and 6 V DC from four D cells, with 4 mm sockets.
- Poster - Ohm's law for a Complete Circuit and EMF — laminated A1 wall poster.
Browse the full Physics Lab range, the Electrical and Electronics range, or all physics lab equipment.
Last updated: 22 October 2026
