C
Capacitor
A capacitive component or bank identified with its circuit function and ratings.
SLD / Schematic
Symbols · R
Resistor
A resistive component with its value and purpose documented separately.
Schematic · R
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.
A distinction that matters
IEC-style rectangular and other conventional resistor depictions can describe the same component concept, but qualifiers and documentation still matter.
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
Public fixed, variable, shunt and heater categories.
IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams
Historical graphic-symbol reference; vendor conventions may differ.
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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