R
Resistor
A resistive component with its value and purpose documented separately.
Schematic
Symbols · LDR
Light-dependent resistor
A light-dependent resistor changes resistance according to illumination.
SLD / Schematic · LDR
What it represents
A light-dependent resistor changes resistance according to illumination. The schematic places the sensing element in its actual electrical network and the equipment detail identifies the illumination conditions.
How to read it
- A surrounding light-sensitive marker describes the component response, not a supply terminal.
- The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation.
Information to show or reference
- State component characteristic
- Identify measured circuit
- Reference illumination arrangement
A distinction that matters
An LDR changes resistance; a photodiode produces a different semiconductor sensing response.
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 documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic.
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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