ERS stands for Energy Recovery System, which is a system used in Formula 1 cars to recover energy that would otherwise be lost during braking and from the cars exhaust. The system consists of two motor generators, an Energy Store (ES), and control electronics. The motor generators are the Motor Generator Unit - Kinetic (MGU-K) and the Motor Generator Unit - Heat (MGU-H), which convert mechanical and heat energy to electrical energy. The energy generated from these motors is then stored in the ES, which is a lithium-ion battery that stores the energy created. The energy stored is then available for the driver to use as and when they see fit. The system which makes the transfer of energy in the car possible is the ERS. ERS can provide up to 120kw (approx. 160bhp) of power for approximately 33 seconds per lap. There are two main types of ERS systems used in F1: KERS and TERS. The kinetic energy recovery system (KERS) captures energy from the car’s brakes, while the thermal energy recovery system (TERS) captures energy from the car’s exhaust.