Fotorezistoarele sînt rezistente dependente de fluxul luminos şi au la bază efectul fotoelectric intern în semiconductoare.
Principalele caracteristici ale fotorezisţoarelor sînt:
— rezistenţa la întuneric, Ra care reprzintă valoarea rezistenţei la iluminarea nulă
— sensibilitate la fluxul luminos.
Fotorezistoarele au fost realizate iniţial pe bază de seleniu cristalin; o largă răspîndire o au, la ora actuală, fotorezistoarele din PbS şi CdS; nu se fabrică în ţară.
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