What is a transistor ?
X 0
Ans:A Transistor is an semiconductor,A transistor controls a large electrical output signal with changes to a small input signal.Since a large amount of current can be controlled by a small amount of current, a transistor acts as an amplifier.A transistor acts as a switch which can open and close many times per second.The most common type of transistor is a bipolar junction transistor.
Layers with extra electrons are called N-Type, those with electrons missing called P-Type. Therefore the bipolar junction transistors are more commonly known as PNP transistors and NPN transistors respectively.
Bipolar junction transistors are typically made of silicon and so they are very cheap.
MMD / MCA ORALS MEO CLASS 4 EXAM
