Motor

—1. An electric motor is a machine for transforming electrical into mechanical power. There are many types of motors designed to meet varying conditions, such as single phase, polyphase, a. c. and d. c., depending upon the kind of current supplied to them, and others adapted to the kind of work to be done by them. Almost any generator will operate as a motor when current is supplied to it, but certain types of motors are not suitable to act as generators, not being,the reverse of any dynamo type.: 2. Internal combustion or electric engines, used to propel vehicles on ordinary roads (motor cars), or internal combustion engines employed for propulsion of small craft, or for working single vehicles on railways.