Özçelik, Mehmet Ali2025-01-212025-01-2120171308-5514https://dergipark.org.tr/tr/download/article-file/465674https://dergipark.org.tr/tr/pub/umagd/issue/36839/419662https://doi.org/10.29137/umagd.419662https://hdl.handle.net/20.500.12587/19231Depending on the amount of light they receive, thelight-sensitive circuit elements generate electrical signals such as current,voltage, and resistance. Thus, these sensors are widely used in lightmeasurement systems, light control systems, and opto-couplers. In this studyunderhand, the electrical values produced by the application of increasinglight on the photodiodes and phototransistors are analysed. According to valuesobtained, the 9.44 standard deviation shows that photodiode has a betterperformance than phototransistor in terms of light sensitivity.eninfo:eu-repo/semantics/openAccessPhotodiodePhototransistorLight IntensityLux-meterPhoto-currentArticle11-788410.29137/umagd.419662419662