Potentiometer Apparatus
Product Code : SCL-PLE-11786
Quick Answer: The Potentiometer Apparatus is a multi-wire slide-wire potentiometer on a hardwood board, offered in 10-wire (10 m) and 4-wire (4 m) versions, with a 100 cm scale and sliding jockey for comparing cell EMFs and finding internal resistance by the null-point method.
Last updated: 18 October 2026
Key Features
- 10-wire (10 m) and 4-wire (4 m) configurations.
- Wire of a low temperature-coefficient alloy for stable readings.
- 100 cm (1000 mm) scale for reading balancing lengths.
- Heavy brass connection strips with 4 mm terminals.
- Sliding jockey with spring-loaded knife-edge contact included.
Technical Specifications
| Specification | Value |
|---|---|
| Wire configurations | 10 wires (10 m) or 4 wires (4 m) |
| Board | Polished seasoned hardwood |
| Scale | 100 cm / 1000 mm |
| Connection blocks | Heavy-duty brass strips, 4 mm terminals |
| Jockey | Sliding, spring-loaded knife-edge |
| Principle | Null-point (no current drawn at balance) |
How It Is Used
A driver cell and rheostat across the wires set a steady potential gradient. The cell under test is connected through a galvanometer to the jockey, which is moved until there is no deflection; the balancing length is read from the scale. Comparing balancing lengths gives the ratio of EMFs, and with a shunt resistor the internal resistance, making it a standard potentiometer for the physics lab.
Frequently Asked Questions
Why does the Potentiometer Apparatus measure the true EMF of a cell?
It works on the null-point principle: at balance no current is drawn from the cell, unlike a voltmeter, so there is no loading of the circuit.
What wire lengths are available on the Potentiometer Apparatus?
A 10-wire (10 m) version and a 4-wire (4 m) version.
Related Physics Lab Equipment
See the full physics lab equipment range, or these related potentiometer experiment items:
JLab India quotes the Potentiometer Apparatus for export buyers in Libya, Zambia, Paraguay, Indonesia and Bulgaria.
For a quotation on the Potentiometer Apparatus, contact JLab India on +91-8569909696.
