Alternating Current

In alternating current (AC, also ac), the movement of electric charge periodically reverses direction. In direct current (DC, also dc), the flow of electric charge is only in one direction.

The abbreviations AC and DC are often used to mean simply alternating and direct, as when they modify current or voltage.

AC is the form in which electric power is delivered to businesses and residences. The usual waveform of an AC power circuit is a sine wave. In certain applications, different waveforms are used, such as triangular or square waves. Audio and radio signals carried on electrical wires are also examples of alternating current. In these applications, an important goal is often the recovery of information encoded (or modulated) onto the AC signal.

Read more about Alternating Current:  History, Transmission, Distribution, and Domestic Power Supply, AC Power Supply Frequencies, Effects At High Frequencies, Mathematics of AC Voltages

Other articles related to "alternating current, current, alternating, currents":

Lansing, St. Johns And St. Louis Railway
... It was the site of a failed attempt to introduce alternating current to the interurban scene ... Arnold sought an opportunity to test his idea for using single-phase alternating current instead of direct current for locomotive power ... notwithstanding, the Lansing Suburban operated the line using standard 600-volt direct current instead of 6000-volt alternating current ...
AC/DC (electricity) - Current Wars - Remnant and Existent DC Systems
... Edison, continued to supply direct current to customers who had adopted it early in the twentieth century, mainly for elevators ... The New Yorker Hotel, constructed in 1929, had a large direct-current power plant and did not convert fully to alternating-current service until well ... DC service, and on November 14, 2007, the last direct-current distribution by Con Edison was shut down ...
Ames Hydroelectric Generating Plant
... commercial system to produce and transmit alternating current (AC) electricity ... installed in the winter, and from Spring 1891 provided alternating current electricity that was transmitted 2.6 miles (4.2 km) to a motor-driven stamp mill at the Gold King Mine ... Total wire costs were about US $700, about 1% of the cost estimated for a direct-current line ...
AC/DC (electricity) - Current Wars - Edison's Publicity Campaign
... Edison carried out a campaign to discourage the use of alternating current, including spreading disinformation on fatal AC accidents, publicly killing ... they were to demonstrate to the press that alternating current was more dangerous than Edison's system of direct current ... Years after DC had lost the "war of the currents," in 1903, his film crew made a movie of the electrocution with high voltage AC, supervised by Edison employees, of Topsy, a ...

Famous quotes containing the word current:

    I have come to believe ... that the stage may do more than teach, that much of our current moral instruction will not endure the test of being cast into a lifelike mold, and when presented in dramatic form will reveal itself as platitudinous and effete. That which may have sounded like righteous teaching when it was remote and wordy will be challenged afresh when it is obliged to simulate life itself.
    Jane Addams (1860–1935)