We love this made-for-kids series of videos, Circuit Playground, by MIT engineer and Adafruit Founder Limor Fried (in the pink hair) and her robot friend ADABOT. For this excellent DIY project — and to find out what’s going on inside of the batteries that you use — get some lemons, pennies, galvanized nails, some aligator clips, and an LED, then watch their second video in the series, B is for Battery.
And if you missed it, watch A is for Ampere.
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