What is a Kers (sp??) system ?

Basically it takes energy from braking/ engine braking depending on the system and stores it in a battery or in william's case a flywheel and it can be used to give the driver a boost of 80 bhp for 6.9 seconds a lap when they push button. However the system is heavy and there is a debate weather it is work it as it is a solid lump of around 40 kg which can upset the handling as that 40kg can't be used in balast to help balance the car and it also causes the car's centre of gravity to rise as it takes room out of the fuel tank which causes the fuel to sit higher and therefore causes the centre of gravity to rise

all the energy that is wasted by the car under braking etc is stored in a battery ( or in BMW case a fan wheel) then this energy can be transformed into around 80 brake horse power when the drivers shoose. and can lasat for about 6.7 seconds. if you watch the bbc coverage then they sometimes shows a little battery which symbolises the KERS and the amount the drivers has used. the KERS gets toped up every lap.

it is what causes the normally wasted energy caused by braking and deceleration to be stored as re-usable energy and (under the present rules) to be put back into the system as a 80BHP boost ~once each lap maxium. can be stored as a current in a battery or as a Kinetic force in a fly wheel hope this helps

try google