What Is a Transistor? A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power. It is made from silicon or germanium and can regulate the flow of electrical current, making it a fundamental component in virtually all electronic circuits. Originally invented in 1947 by John Bardeen, Walter Brattain, and William Shockley at Bell Labs, th... https://epro.pk/product/irf630-mosfet-transistor-set-3pcs-n-channel-200v-9a/