# Resistor

Canonical URL: https://eloragrid.ai/symbols/resistor
Publisher: Elora Grid
Updated: 2026-10-13
Lookup label: R
Drawing use: Schematic
Reference families: IEC, IEEE / ANSI

A resistive component with its value and purpose documented separately.

## What it represents

A resistor representation identifies a resistive component in a circuit. Different drawing conventions can use different basic outlines, while additional qualifiers distinguish variable resistors, shunts or heating elements. The value, rating and purpose are separate annotations.
In power-system controls, a resistive component may belong to measurement, suppression or another specific circuit. A neutral-earthing resistor is a specialised system component and should not be identified only with an unqualified generic resistor mark.

## How to read it

- Read the component value and application label alongside the mark.
- Check whether a qualifier identifies a variable device, heater, shunt or another variant.

## Information to show or reference

- Reference resistance and rating information.
- Identify the circuit purpose.
- Distinguish specialised assemblies from a generic component.

## Important distinction

IEC-style rectangular and other conventional resistor depictions can describe the same component concept, but qualifiers and documentation still matter.

## Facts

- Component data: Resistance and power rating
- Variants: Fixed, variable, shunt and other applications
- Graphic convention: Check the drawing legend
- Public Autodesk reference names: HRE1B, VRE1B (vendor identifiers, not IEC symbol IDs)

## Public references

- [Resistors and heater-element symbols](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-1D071951-D38E-4B15-8B9E-C30ECBD55C19.htm) — Autodesk. Public fixed, variable, shunt and heater categories.
- [IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams](https://standards.ieee.org/ieee/315/515/) — IEEE Standards Association. Historical graphic-symbol reference; vendor conventions may differ.

## 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.