Device harvests energy from walking to charge your mobile and wearable electronics

A promising power generation system uses the energy you expend walking or running to power mobile devices.

This generator harvests power from a car’s rolling tires

Some 10% of the energy generated by a car’s engine is lost due to friction between tires and the pavement. What if you could harness this lost energy somehow? A group at the University of Wisconsin-Madison in collaboration with researchers in China have found a ingenious way to collect and use this friction energy by effectively inserting nanogenerators into tires.