Electrical converters; Current rectifiers; Electricity reducers in the nature of electricity limiters, Electronic controllers used to reduce power consumption; Electrical inverters; Lighting ballasts; Electrical transformers; Boosters, namely, power amplifiers, power transformers for amplification; Stable electrical sources, namely, electrical power supplies, Voltage stabilizing power supply; Low voltage power supply; Electrical regulating apparatus, namely, voltage regulators for electric po...