Don’t you wish you could charge your cell-phone anywhere outdoors? A human-powered hand-cranked charger is a good way to do it. Read video article here: http://www.electroboom.com/?p=704 Follow me on Facebook: http://www.facebook.com/ElectroBOOM Support ElectroBOOM at Patreon: http://patreon.com/electroboom Follow me on Twitter: https://twitter.com/ElectroBOOMGuy Video of Full Bridge Rectifier: https://www.youtube.com/watch?v=jhvrfyjtOgU Video of Measuring Eye Resistance: https://www.youtube.com/watch?v=sI5Ftm1-jik By: Mehdi Sadaghdar