gear – n. a set of wheels that work together to affect the relation between the speed of a moving vehicle and the speed driven parts

battery – n. a device that is placed inside a machine to supply it with electricity

efficiency – n. the ability to do something or produce something without wasting materials, time, or energy

range – n. the distance within which something can be reached

gasoline – n. a liquid fuel used to power motor vehicles

emission – n. the act of producing or sending out something (such as energy or gas); something sent out or given off

source – n. a place or thing from which something comes

brand – n. a model or kind of product
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