WordNet
n. a transformer whose voltage ratio of transformation can be adjusted
Wikipedia
A voltage regulator is designed to automatically maintain a constant voltage level. A voltage regulator may be a simple " feed-forward" design or may include negative feedback control loops. It may use an electromechanical mechanism, or electronic components. Depending on the design, it may be used to regulate one or more AC or DC voltages.
Electronic voltage regulators are found in devices such as computer power supplies where they stabilize the DC voltages used by the processor and other elements. In automobile alternators and central power station generator plants, voltage regulators control the output of the plant. In an electric power distribution system, voltage regulators may be installed at a substation or along distribution lines so that all customers receive steady voltage independent of how much power is drawn from the line.
Usage examples of "voltage regulator".
They'd said it an hour ago, when the voltage regulator on their only 20k can transport went fritz and died the death.
I decided having a bot recharge the others was a little more risk than I wanted to take since the voltage regulator seemed to vary a lot and had to be constantly watched.
He walked out a few feet into the main aisle between the cabinets holding the voltage regulator series and put his hands in his pockets, stopping to look around.
Also a generator, voltage regulator and an alternator if you want the station to be mobile.
Her fingers saw it and teased it out into view from where it had been tucked behind a voltage regulator: a carefully snipped wire.