The transistor is the fundamental building block of modern electronic devices, it is a semiconductor device used to amplify and switch electronic signals.

More simply a transistor is a valve for electricity. In this video I demonstrate the two types of transistors (NPN and PNP) and explain their uses.

Here are the two symbols [...]

A Breadboard is a must for the electronics experimenter type of person for experimenting activities. It is made up of rows of pins that you can simply press in components and wires and they will be held in by pressure.