Potentiometer Apparatus
Product Code : SCL-PLE-11786
The StemAids Potentiometer Apparatus is a high-sensitivity electrical instrument engineered for the empirical measurement of potential difference, internal resistance, and the comparison of EMF (E) of primary cells. Unlike a standard voltmeter, which draws current from the source, the potentiometer operates on the "null-point" principle, making it an ideal tool for measuring the true EMF without circuit loading. Manufactured to ISO 9001:2015 standards, it is optimized for University and Secondary-level physics laboratories.
Technical Specifications
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Tender Specification |
OEM Technical Detail |
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Base Construction |
Polished seasoned hardwood board (approx. 1.1m to 1.2m length) |
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Wire Configuration |
10-wire (10-meter) or 4-wire (4-meter) configurations available |
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Wire Material |
Constantan or Manganin (G-24/26) for low temperature coefficient of resistance |
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Scale |
Integrated 100cm/ 1000mm boxwood or stainless steel scale |
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Connection Blocks |
Heavy-duty brass strips with 4mm safety-shrouded or screw terminals |
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Contact Interface |
Includes a sliding Jockey with a spring-loaded "knife-edge" contact |
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Pulley/Tensioning |
Friction-free returns to ensure uniform wire tension across all parallel lengths |
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ISO Compliance Code |
Manufactured under ISO 9001:2015 Quality Management Systems |
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HS Code |
9023.00.00 (Educational/demonstrational scientific apparatus) |
Key Pedagogical Outcomes (Bloom’s Taxonomy Alignment)
- Null-Point Interface: Facilitates student visualization of the principle that potential drop is directly proportional to the length of the wire (V∝l), supporting Advanced Electromagnetism modules.
- EMF Quantification: Enables the physical study of cell dynamics, allowing learners to apply the formula E2E1=l2l1 to compare two different primary cells (e.g., Leclanché and Daniel cells).
- Internal Resistance Analysis: Supports the analysis of real-world battery behavior; students can evaluate the internal resistance (r) of a cell using the formula r=R(l2l1−l2).
- Sensitivity Evaluation: Allows students to evaluate how the number of wires (total length) affects the potential gradient (k), fostering an understanding of measurement precision and resolution.
International Logistics & Compliance
StemAids ensures comprehensive OEM readiness for global institutional procurement:
- Packaging: Export-grade seaworthy crating (ISPM-15 compliant) featuring longitudinal stabilizers to prevent the wooden base from bowing, which is critical for maintaining wire-to-scale calibration.
- Documentation: Includes Manufacturer’s Authorization Form (MAF), Certificate of Conformance (CoC), and a technical datasheet on wire resistivity and potential gradient.
- Durability: Tropicalized design featuring vacuum-seasoned wood and anti-tarnish coatings on brass components, ensuring long-term reliability in high-humidity laboratory environments.
Direct OEM Sourcing Advantages
Procuring the StemAids Potentiometer Apparatus directly ensures vertical manufacturing control:
- In-House Wire Calibration: Every wire length is batch-tested for diameter uniformity to ensure a linear potential drop, which is essential for accurate data plotting.
- Zero-End Error Control: Direct oversight of the brass strip installation ensures that the "zero" of the scale aligns perfectly with the start of the resistive wire.
- Direct Factory Spares Availability: Guaranteed availability of replacement jockeys, constantan wire spools, and high-sensitivity galvanometers to maximize laboratory ROI.
- Manufacturing Control: Direct oversight of the scale engraving ensures absolute clarity and alignment, reducing user error during the identification of the balance point.
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