What is Motor–generator?
[[File:Synchronous motor-generator set for AC to DC conversion (Rankin Kennedy, Electrical Installations, Vol II, 1909).jpg|thumb|Motor-generator set for AC to DC conversion]] A '''motor–generator''' is a device for converting [[electricity|electrical power]] to another form. Motor–generator sets are used to convert [[frequency]], [[voltage]], or [[Three-phase electric power|phase]] of power. They may also be used to isolate electrical loads from the electrical power supply line. Large motor–generators were widely used to convert industrial amounts of power while smaller motor–generators were used to convert [[battery (electricity)|battery]] power to higher voltages. Nowadays, motor–generators have largely been replaced by [[semiconductor]] devices. Examples include [[rectifier]]s for converting [[alternating current]] (AC) to [[direct current]] (DC) and [[inverter]]s for converting DC to AC. [[Category:Electricity]] {{physics-stub}}