A transistor is a component used in an electronic circuit, its purpose being to control large amounts of currents with small amounts of currents. Transistors are used across a wide array of electronic devices because they can be used to rectify or amplify signals and power. Because they are operationally successful, small in size and relatively inexpensive to manufacture, transistors are found in virtually every modern electronic device that exists. Applications such as computers, phones, or microchips are a few examples of popular electronics that rely on transistors to function.