1. Autos

An Internal combustion engine and a motor/alternator

From , former About.com Guides

2007 Saturn Aura Green Line engine bay

On the left is the efficient ECOTEC engine. Right is the power inverter for electric power control. This system employs a high-tension belt driven starter/alternator to start the engine and give mild assist. GM calls it BAS (Belt Alternator Starter).

photo © Adrian Gable

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