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A resistor in a circle with two arrows pointing at it.
Also known as: LDR symbol, Photoresistor symbol, Photocell symbol
A photoresistor is drawn as a resistor with two arrows pointing towards it, the arrows being the schematic convention for incident light. The same pair of inward arrows marks every light-sensing device, so the convention transfers to photodiodes and phototransistors.
Denotes a resistor whose value falls as light falls on it, used in light-sensing circuits.
Contexts: Technical drawing, Electrical equipment
Uses two arrows pointing inwards, which is the general schematic convention for a device receiving light, as opposed to two arrows pointing outwards for one emitting it.
Contexts: Technical drawing, Electrical equipment
A rectangle enclosed in a circle with two parallel arrows pointing towards it from outside.