Massimo Banzi is the co-creator and CEO of Arduino. (What's Arduino? It's a fantastic electronics prototyping platform for everyone). In this video, Massimo covers a lot of ground -- he explains what a circuit is, what several common components are, and how to connect them together using a solderless breadboard.
Want to learn more? Check out Massimo's excellent book, Getting Started with Arduino.
Arduino Video Tutorial 01: Get to know your Tools with Arduino CEO Massimo Banzi (see all the tutorials here)
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Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. His new book is Maker Dad: Lunch Box Guitars, Antigravity Jars, and 22 Other Incredibly Cool Father-Daughter DIY Projects