A compound or substance that can speed up or slow down the reaction of other substances without being consumed itself. In a catalyst converter, special materials platinum or palladium and rhodium in parentheses are used to promote combustion of an burned hydrocarbons and reduce carbon monoxide and nitrogen oxides in the exhaust gases.
The part of a battery made from two dissimilar metals and an acid solution. A cell stores chemical energy to be used later as electrical energy.
The flow of current from a battery; to remove the refrigerant from an air-conditioning system.
A device attached to a mechanically driven cooling fan that allows the fan to freewheel when the engine is cold and the vehicle is driven at speed.