"power circuit" is correct and usable in written English.
You could use it in a sentence such as, "The power circuit needs to be updated to accommodate the new equipment."
In early wireless transmission, the antenna was directly in the power circuit and broadcasting was limited to a range of about 15 kilometres.
Helena Morrissey, chief executive of Newton Investment Management, which backed the research, argued that the study rebutted the frequently-voiced criticism that getting women on boards was an elite issue irrelevant to workers outside the corporate power circuit.
Volendam's first goal was missed by most cameras though, as two half-bright repairmen trying to fix a faulty scoreboard cut the stadium's main power circuit while trying to replace a fuse.
The main power circuit is composed of a full-bridge or half bridge power inverter.
The most important characteristics of matrix converter include simple and compact power circuit.
Various low power circuit and architectural techniques, for mitigating leakage power, are described in this chapter.
Puzzles largely involve changing power circuits, moving one source to another place.
Diode failures are a limiting factor for the reliability of power circuits.
Improving the speed of such low power circuits is a major design challenge in ultra low power domain.
The harvested energy is stored in a rechargeable battery and then totally used to feed power circuits and transmit information to the destination node.
Instrument transformer: Potential or current transformer used to accurately and safely represent voltage, current or phase position of high voltage or high power circuits.
