In its simplest sense, a flywheel is any rotating disk that is installed to collect and supply energy to any system by storing this energy in the form of rotational kinetic energy.  A rotating flywheel responds to any momentum that tends to change the direction of its rotation axis by

Today Volvo has announced it will unveil the PHEV V60 in Geneva in March before releasing it for sale in 2012. With a full charge the PHEV V60 will offer 50km (31 miles) on electricity alone which is about the same as the Chevy Volt. This is possible by the