Bill Levien thinks this is interesting: Fundamentals Direct and alternating current The flow of current that you get from a battery is known as direct current, or DC. Like the flow of water from a faucet, it is a steady stream, in one direction. The flow of current that you get from the “hot” wire in a power outlet in your home is very different. It changes from positive to negative 60 times each second (in Great Britain and some oth... From 1. Experiencing Electricity from Make: Electronics by Charles Platt Publisher: Maker Media, Inc Released: December 2009 Note AC vs DC #electricity Share this highlight http://www.safaribooksonline.com/a/make-electronics/72419/ Twitter Facebook Google Plus Email Get Instant Access Now Start a Free Trial Learn about Safari for Business Have an account? Sign in. Minimise Unlock the rest of Make: Electronics and 30,000 other books and videos By clicking this box, you confirm that you have read and agree to the terms and conditions of our Membership Agreement, and you understand that when your trial period ends, you will be required to provide billing information if you wish to continue using the service. Unlock the rest of this book Start a Free 10-Day Trial loading Learn about Safari for Business Have an account? Sign in.