MAKE presents: The Capacitor from make magazine on Vimeo.
Collin Cunningham of MAKE made this terrific video that explains what a capacitor is and how to make your own.
In January, Collin produced a similar video about LEDs.
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