ocr: GLOSSARY TRANSISTOR Transistors are made from LAYERS OF three layers ofdifferent types SEMICONDUCTING ofsemiconductors. They are MATERIAL used as both electronic switches and amplifiers. CURRENT Current flowing across the transistor's layers is either regulated or turned on and offby a control signal fed CONTROL into the central layer. SIGNAL Diode Light-Emitting Diode Photodiode Semiconductors
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