Abstract: Disclosed are a power control apparatus and method thereof capable of controlling a load power by adjusting an AC power voltage supplied to a streetlamp, a computer system, and electronic equipment according to a load characteristic and object. The power control apparatus comprising: a current coil for varying a voltage; a current detecting section for detecting a current and outputting a data, an input voltage detecting section for detecting a voltage; an output voltage detecting section for detecting the voltage; a system controller for outputting a plurality of trigger control signals controlling a peripheral equipment and identifying an operation condition of a system; a switching section operated according to the plurality of trigger control signals; and an output voltage adjusting section for determining increase or decrease of the flux linkage of the current coil.