AC


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Ac,

symbol for the element actiniumactinium
[Gr.,=like a ray], radioactive chemical element; symbol Ac; at. no. 89; mass number of most stable isotope 227; m.p. about 1,050°C;; b.p. 3,200°C;±300°C;; sp. gr. 10.07; valence +3. Actinium is a silver-white metal with a cubic crystalline structure.
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AC:

see alternating currentalternating current,
abbr. AC, a flow of electric charge that undergoes periodic reverses in direction. In North America ordinary household current alternates at a frequency of 60 times per second. See electricity; generator.
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ac

(electricity)

aC

(electricity)

Ac

(chemistry)
(meteorology)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

AC

1. On drawings, abbr. for alternating current.
2. On drawings, abbr. for armored cable.
3. Abbr. for air conditioning.
4. Abbr. for “asbestos cement.”

alternating current

An electric current that varies periodically in value and direction, first flowing in one direction in the circuit and then flowing in the opposite direction; each complete repetition is called a cycle, and the number of repetitions per second is called the frequency; usually expressed in Hertz (Hz).
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

AC

(1) The latest Wi-Fi version. See 802.11ac.

(2) (Alternating Current) The common form of electricity from power plant to home and office. Its direction is reversed 60 times per second in the U.S.; 50 times in Europe. Contrast with DC.
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