R
Resistor
A resistive component with its value and purpose documented separately.
Schematic
IEC · HVR1R8
Carbon-disc variable resistor
This representation identifies the publisher's carbon-disc variable-resistance form.
IEC · Carbon-disc variable resistor
Autodesk IEC-60617 Symbol Preview — Resistive component forms; vendor family reference, not certified IEC geometry or database identifier.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
Schematic · HVR1R8
What it represents
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.
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.
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.
A distinction that matters
The material/mechanism indication is distinct from a generic electronic potentiometer.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Resistors and heater-element symbols
Official public publisher family name and reference context; vendor identifiers and graphics are distinct from licensed IEC database content.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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