Voq said:
They are both correct? Current is dependent on a voltage, so there must always be a voltage for there to be a current.LvW said:
Transistors are electronic devices that are used to amplify or switch electronic signals. They consist of three layers of a semiconductor material, with two layers being the same type (either N-type or P-type) and the third layer being the opposite type. When a small current is applied to the middle layer, it can control a larger current flowing between the other two layers, allowing for amplification or switching of signals.
Transistors were first invented in 1947 by John Bardeen, Walter Brattain, and William Shockley at Bell Labs. This discovery revolutionized the field of electronics, as it replaced the bulky and inefficient vacuum tubes that were previously used in electronic devices. The first transistors were made of germanium, but later advancements led to the use of silicon, which is still the most commonly used material in transistors today.
There are two main types of transistors: bipolar junction transistors (BJTs) and field-effect transistors (FETs). BJTs have three layers of semiconductor material and are commonly used for amplification, while FETs have only two layers and are often used for switching. Within these categories, there are also different subtypes such as NPN and PNP BJTs, and MOSFETs and JFETs for FETs.
Transistors play a crucial role in modern electronic devices. They are used in computer processors, radios, televisions, smartphones, and many other electronic devices. In computers, transistors are used to amplify and switch electrical signals, allowing for the processing and storage of large amounts of data. In radios and televisions, transistors are used to amplify and tune in to specific frequencies. And in smartphones, transistors are used in the microchips that control and process all of the device's functions.
There are many books, links, and articles available for learning about transistors. Some good resources include "The Art of Electronics" by Paul Horowitz and Winfield Hill, "Transistor Basics" by Mike Tooley, and online resources such as All About Circuits and Electronics Tutorials. Additionally, universities and colleges often offer courses in electronics and semiconductor devices that cover transistors in depth.
