A system to store energy from the force created when braking. Easily said you "charge" either a flywheel or a battery with energy by applying a generator to the moving wheel and thus forcing it to slow down due to the extra friction the generator causes. This energy can then be used to speed up the car in later stages. There's a 60kW max on output from KERS in F1
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KERS is a system implemented in F1 in the 2009 season. It stands for Kinetic Energy Recovery System. It essentially stores energy under braking that can be used in short stints on each lap. The extra power provides roughly 80 bhp and can be used briefly for extra power or passing. It is time limited per lap.
Currently McLaren, Ferrari, Renault and BMW have fitted their cars with KERS. The KERS system adds extra weight to the car and hence some constructors have not fitted KERS. The KERS system provides an extra horse power boost of upto 6.5 seconds when fully charged.
KERS stands for 'Kinetic Energy Recovery System' and is where energy produced from the rear axle when the driver applies the brakes is stored in a battery. The driver can then use this energy from the battery for an extra boost of power when attempting to overtake another driver or when defending from being overtaken by another driver. Each car equipped with KERS may use this extra energy, approximately 80 horsepower and activated by pressing a button on the steering wheel, for a maximum of 6.6 seconds per lap.
Kers stands for kinetic energy recovery system. It gives the drivers a boost of 60Kw for about 6-7seconds.
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In Formula 1 season this year (2011) KERS will be back in the sport. Although F1 didn't invent the system they have championed it in the past and now back again.