Must, for alternating-current systems, have two or more wires of a circuit drawn in the same conduit.
The alternating-current arc-lamp was developed after the appearance of the direct-current open-arc and has been widely used.
Arc lamps may be either continuous-current or alternating-current lamps.
The second torpedo they caught and deflected on a beam of alternating-current magnetism that repelled it.
The alternating-current arc is much noisier than the direct-current arc, but with very high frequencies this noise ceases.
Its two fundamental parts are an alternating-current generator and a polarized bell-ringing device.
The former is an alternating-current generator; the latter is a rheostat.
If thus constructed, the machine is a well-known form of alternating-current generator.
In alternating-current circuits its place is taken by the dynamometer type, which reads both direct and alternating currents.
He also holds several patents for alternating-current machinery, and has written largely on electrical subjects.
alternating current |
An electric current that repeatedly changes its direction or strength, usually at a certain frequency or range of frequencies. The term is also used to describe alternating voltages. Power stations generate alternating current because it is easy to raise and lower the voltage of such current using transformers; thus the voltage can be raised very high for transmission (high voltages lose less power as heat than do low voltages), and lowered to safe levels for domestic and industrial use. In North America, the frequency of alternation of the direction of flow is 60 Hz, or 60 cycles per second. In other parts of the world it is 50 Hz. Compare direct current. See Notes at current, Tesla.
An electric current in which the flow reverses periodically. (Compare direct current (DC).)
Note: In the United States, most household current is AC, going through sixty reversal cycles each second. Electric motors in household appliances are designed to work with current at this rate of reversal.