the invention of transistors revolutionized human civilization like no other technology at the heart of a smartphone lies a processor and this processor holds about two billion transistors what do these incredibly tiny devices do how do they work transistors can act like a switch with no moving parts they can amplify a weak signal in fact amplification is the basic function of a transistor first let's understand the basis of transistors we will come back to the application part later transistors are made of semiconductors such as silicon each silicon atom is bonded with four neighboring silicon atoms silicon has four electrons in its valence shell let's replace this silicon atom with a four-handed Smyly each hand holds one electron each one of these electrons goes for sharing with a neighboring silicon atom this is known as a covalent bond currently the electrons are in their valence band if the pure silicon has to conduct electricity the electrons have to absorb some energy an...
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