This is determined by the total power required by the alternating See electric current. loads and the The amount of electromotive force, measured in volts, that exists... of any direct See electric current. loads. Generally, the larger the The demand on an energy producing system; the energy consumption..., the higher the A device that converts direct current electricity to alternating current... input The amount of electromotive force, measured in volts, that exists.... This keeps the See electric current. at levels where switches and other components are readily available.