Electricity

Operating principles. The separately excited DC generator. The self excited shunt generator. Compound-wound DC generator. The DC shunt motor. The DC series motor. DC compound motors. Summary review. Manual starting rheostats for DC motors. Special DC starting rheostats and controllers. Basic principles of automatic motor control. The DC counter EMF motor controller and DC variable speed motor drives. The DC voltage drop acceleration controller. The DC series lockout relay acceleration controller. Dynamic braking with a DC motor reversal control. Summary review. Introduction to polyphase circuits. The three-phase Wye connections. The three-phase delta connection. Basic principles of transformers. Single-phase transformers. The single-phase, three-wire secondary system. Instrument transformers. National Electrical Code Requirements for transformer installations.