25 OHM VARIABLE RESISTOR
Product Code : SCL-MH-11989
The 25 Ohm Variable Resistor is a high-precision sliding rheostat engineered for current regulation and circuit analysis in University, Vocational (TVET), and Secondary educational environments. Constructed with a non-inductive winding on a thermally stable ceramic core, this educational instrument ensures linear resistance adjustment and robust heat dissipation. It is fully compliant with international laboratory safety standards and optimized for Ohm’s Law demonstrations and bridge circuit applications.
Technical Specifications
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Tender Specification |
OEM Technical Detail |
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Resistive Element |
Oxidized Nichrome/Constantine Wire (Grade A) |
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Core Material |
High-Insulation Extruded Porcelain (Ceramic) |
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Maximum Resistance |
25 Ohms (±5% Tolerance) |
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Rated Current Capacity |
2.8 Amperes (Continuous Load) |
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Slider Mechanism |
Chrome-Plated Steel Rod with Low-Friction Brass Contact |
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Terminal Interface |
3 x 4mm Shrouded Safety Terminals (Input/Output/Slider) |
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End Supports |
Heavy-Duty Molded Bakelite (Impact-Resistant) |
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HS Code |
8533.40.20 (Variable Resistors/Rheostats) |
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Operational Temperature |
Tested up to 150°C without mechanical deformation |
Key Pedagogical Outcomes (Bloom’s Taxonomy)
Feature: Linear Sliding Contact.
Outcome: Facilitates the Application of Ohm’s Law ($V = IR$) by allowing students to observe real-time current fluctuation relative to resistive length.
Feature: Triple Terminal Configuration.
Outcome: Enables students to Analyze the functional difference between a two-terminal rheostat (current control) and a three-terminal potentiometer (voltage division).
Feature: Exposed Wirewound Construction.
Outcome: Supports Knowledge retention regarding the physical properties of conductors, specifically the relationship between wire gauge, length, and resistance ($R = \rho \cdot L/A$).
Feature: High-Wattage Heat Dissipation.
Outcome: Allows for safe Experimental Testing of high-current circuits without instrument failure, fostering a robust understanding of Joule’s Law of Heating.
International Logistics & Compliance
This educational instrument is engineered for the rigors of global procurement and transcontinental shipping.
Packaging: Shipped in export-grade, seaworthy crating (ISPM-15 compliant) to prevent transit damage and moisture ingress.
Documentation: Every consignment includes a Manufacturer’s Authorization Form (MAF), Certificate of Conformity (CoC), and detailed User Manuals in English. IQ/OQ/PQ validation protocols are available upon request for institutional tenders.
Durability: Tropicalized design parameters ensure the unit remains operational in high-humidity environments (up to 90% RH) and ambient temperatures up to 45°C.
Why Source from the OEM?
Sourcing directly from the Original Equipment Manufacturer ensures vertical integration of the production cycle. Unlike traders, our facility maintains in-house control over ceramic extrusion, wire winding tension, and chrome-plating, ensuring batch-to-batch uniformity. We guarantee the availability of direct factory spares, including slider-rods and contact brushes, extending the lifecycle of the laboratory asset by years. Each unit is calibrated and batch-tested to ensure that the marked resistance values meet contractual accuracy specifications.
