With the introduction of the complex hybrid engines Formula 1 realized something needed to be done to keep the cost in check like limiting the number of engines than can be used in a year. But since the new engines are complex systems with lots of different components, the old system no longer could be applied. After all, the engine is just a part in a complex system where all components are important and expensive; all of which need to be durable. So the power unit was segmented in six components: the engine, the Motor Generator Unit-Heat, the Motor Generator Unit-Kinetic, the Energy Store (battery), the Turbo Charger and the Control Electronics. And every car can use four units of each...
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