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The output will usually be DC in the range 1.5–24 V. Power supplies that output either 100–120 V AC or 210–240 V AC are available; they are called inverters, due to the conversion from DC to AC rather than the voltage change. The output frequency and waveform of an inverter may not accurately replicate that supplied by mains electricity ...
Consumer voltage converters (also known as "travel converters") are used when traveling between countries that use ~120 V versus ~240 V AC mains power. (There are also consumer "adapters" which merely form an electrical connection between two differently shaped AC power plugs and sockets , but these change neither voltage nor frequency.)
Sockets for 220-240 V European type C plugs are typically available at hotels; some buildings modify voltage, so travellers are advised to check before plugging in. Type F are also available at some hotels. Bosnia and Herzegovina: C, F 230 V 400 V 50 Hz Botswana: D, G, M 230 V 400 V 50 Hz Brazil: C, N NBR 14136 127 V 220 V [16] 220 V
Single-pole circuit breakers feed 120 V circuits from one of the 120 V buses within the panel, or two-pole circuit breakers feed 240-volt circuits from both buses. 120 V circuits are the most common, and used to power NEMA 1 and NEMA 5 outlets, and most residential and light commercial direct-wired lighting circuits.
Mains electricity or utility power, grid power, domestic power, and wall power, or, in some parts of Canada, hydro, is a general-purpose alternating-current (AC) electric power supply. It is the form of electrical power that is delivered to homes and businesses through the electrical grid in many parts of the world.
Ideally, each phase's voltage, current, and power is offset from the others' by 120°, thus having all at equidistance. This symmetry can also be recreated in converters. Three-phase electric power transmission lines Three-phase transformer (Békéscsaba, Hungary): On the left are the primary wires, and on the right are the secondary wires.
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