# ANSI/IEEE Carbon-disc variable resistor form Canonical URL: https://eloragrid.ai/symbols/ansi-carbon-disc-variable-resistor Publisher: Elora Grid Updated: 2026-10-28 Lookup label: HVR1R8 Drawing use: Schematic Reference families: IEEE / ANSI, Manufacturer ## Symbol convention Convention: IEEE / ANSI Form: Variable Resistor with Carbon Disks Autodesk IEEE Symbol Preview: Resistive Components, block HVR1R8. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier. Related representation: [Carbon-disc variable resistor](https://eloragrid.ai/symbols/iec-carbon-disc-variable-resistor) IEEE-library form of carbon-disc variable resistor: this representation identifies the publisher's carbon-disc variable-resistance form. ## In plain English ### What does ANSI/IEEE Carbon-disc variable resistor form mean? This reference locates carbon-disc variable resistor in Autodesk's IEEE-oriented resistive components family. This representation identifies the publisher's carbon-disc variable-resistance form. The publisher identifies a variable resistive form using carbon discs as part of its operating construction. That identifies a component principle without assigning a resistance law or power rating. The public library uses HVR1R8 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number. ### A simple example Follow the actual current path and terminal polarity in the surrounding circuit. The symbol identifies an electrical function; voltage, current, energy limits and the device package pinout come from the selected component data rather than from the outline. ### What the drawings help you do Document the actual control mechanism and terminal arrangement where the device appears in a legacy circuit. It should not be silently replaced with a potentiometer having a different connection and operating behaviour. State the resistance-control mechanism and associated terminals in the equipment description. The material/mechanism indication is distinct from a generic electronic potentiometer. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted. ### This particular reference IEEE-library form of carbon-disc variable resistor: this representation identifies the publisher's carbon-disc variable-resistance form. The material/mechanism indication is distinct from a generic electronic potentiometer. ### Terms - Terminal: An identified point where a conductor connects. - Rating: A value stating the conditions for which equipment is specified. - Schematic: A drawing showing function and connections rather than physical appearance. Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram. - [Autodesk IEEE Symbol Preview — Resistive Components](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-1A45DE3A-CD2A-4AD9-8125-219905C870B1.htm) ## What it represents This reference locates carbon-disc variable resistor in Autodesk's IEEE-oriented resistive components family. This representation identifies the publisher's carbon-disc variable-resistance form. The publisher identifies a variable resistive form using carbon discs as part of its operating construction. That identifies a component principle without assigning a resistance law or power rating. The public library uses HVR1R8 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number. Follow the actual current path and terminal polarity in the surrounding circuit. The symbol identifies an electrical function; voltage, current, energy limits and the device package pinout come from the selected component data rather than from the outline. Document the actual control mechanism and terminal arrangement where the device appears in a legacy circuit. It should not be silently replaced with a potentiometer having a different connection and operating behaviour. State the resistance-control mechanism and associated terminals in the equipment description. The material/mechanism indication is distinct from a generic electronic potentiometer. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted. ## How to read it - State the resistance-control mechanism and associated terminals in the equipment description. - The material/mechanism indication is distinct from a generic electronic potentiometer. ## Information to show or reference - Identify the associated device, circuit or diagram boundary. - State the resistance-control mechanism and associated terminals in the equipment description. - Cross-reference the equipment data, terminal mapping or operating-state legend needed to interpret the form. ## Important distinction The material/mechanism indication is distinct from a generic electronic potentiometer. ## Facts - Convention evidence: Autodesk IEEE Symbol Preview: Resistive Components; published form: Variable Resistor with Carbon Disks. - Public vendor block: HVR1R8. Vendor library token, not an IEEE symbol number. - Information added: State the resistance-control mechanism and associated terminals in the equipment description. - Preview: Independent educational concept; consult the publisher and applicable standard for the exact graphic - Artwork scope: Original educational geometry. Exact standard graphics, product ratings and terminal pinouts are not certified. ## Public references - [Autodesk IEEE Symbol Preview — Resistive Components](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-1A45DE3A-CD2A-4AD9-8125-219905C870B1.htm) — Autodesk. Public IEEE-oriented Resistive Components table explicitly lists HVR1R8 as Variable Resistor with Carbon Disks. This supports the vendor convention context, not reproduction of the publisher graphic. ## Graphic scope Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.