Because it is easier to distribute over large distances with relatively low losses, and it is a bit safer for the same voltage if touched. Direct current, abbreviation DC, flow of electric charge that does not change direction. As an adjective, the term DC is used in … +1 The reason we use AC current in our homes is because AC can travel longer distances over the electrical grid (sometimes called stepping up the current)and the current changes polarity by cycles. in my country 220v 50 Hz). Edison developed direct current -- current that runs continually in a single direction, like in a battery or a fuel cell. Direct current was supplanted by alternating current (AC) for common commercial power in the late 1880s because it was then uneconomical to transform it to the high voltages needed for long-distance transmission. But there was one problem. DC is very much more difficult (and expensive) to do this with. In the United States alternating current, or AC, wins over direct current, or DC, as a source of electricity because it is more efficient; the voltage of the current is easy to manipulate. When a DC is required, and the use of battery is uneconomical or requires constant charging, a power supply is used to convert the ac to dc. DC (direct current) is the unidirectional flow or movement of electric charge carriers (which are usually electrons). During the early years of electricity, direct current (shorthanded as DC) was the standard in the U.S. Direct current is not easily converted to higher or lower voltages. The current coming through the electricity plug is AC everywhere in the World with different voltage values and with different frequencies (ex. Although DC could be used, it would require more infrastructure to provide electricity to every home. A2A The North American grid is using an increasing amount of HVDC for transmission. Alternating current is used in most electricity distribution systems for several reasons, but the most important one is the ease with which it can be transformed from one voltage to another. Direct current is produced by batteries, fuel cells, rectifiers, and generators with commutators. Plot of direct current/voltage against time The DC is usually used in low-voltage applications such as battery operated equipment. Why ? In Alberta I have worked on the construction of a converter station that rectifies 500 KVAC from a nearby power generating station to 500 KVDC. Also the current in the neutral wire would have to return to the generating station. DC circuit breaker, like their name suggests, is used for the protection of electrical devices that operate with direct current. However, direct current is used for computers, batteries and LEDs, according to the U.S. Department of Energy. The intensity of the current can vary with time, but the general direction of movement stays the same at all times.
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