Difference between transistor and diode? All Questions › Category: Analog Electronics › Difference between transistor and diode? 0 Vote Up Vote Down Chetan Shidling Staff asked 4 years ago I need short information. 1 Answers 0 Vote Up Vote Down Chetan Shidling Staff answered 4 years ago A diode is used to convert supply from AC to DC, whereas the transistor is used as a switch or amplifier.