Side-by-side reference

Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

First referenceCompare with

HEATER

Symbols

Heating element

A heating element converts electrical energy to heat in a documented circuit. Its supply, power rating and control/protection path need to be identified for cabinet or auxiliary-system use.

Drawing use: SLD / Schematic
Application: Control circuits
Reference family: IEC / Manufacturer

A distinction that matters

A heater is a load; its thermostat is a separate switching or measurement function.

Full reference

Symbols

Resistor

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.

Drawing use: Schematic
Application: Control circuits
Reference family: IEC / IEEE / ANSI

A distinction that matters

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

Full reference

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.