by 3 hours ago
ANSWERS: 3
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An alternating current (AC) is an electrical current whose magnitude and direction vary cyclically, as opposed to direct current, whose direction remains constant. The usual waveform of an AC power circuit is a sine wave, as this results in the most efficient transmission of energy. However in certain applications different waveforms are used, such as triangular or square waves. Used generically, AC refers to the form in which electricity is delivered to businesses and residences. However, audio and radio signals carried on electrical wire 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. source: http://en.wikipedia.org/wiki/Alternating_current click link for more info about alternating currents
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AC generators also known as alternators generate alternating current. Inside the generator is a rotating conductor also known as the armature. The armature cuts through a magnetic field cretaed by magnets inside. Electrons flow throuh the armature(also connected to the external circuit)as it turns. Every half turn the electron flow reverses, following the generator rule. Electrons then flow in the opposite direction. This creates a wave pattern in the current being induced. Insted of generating a pulsating direct current. It generates a more efficient alternating current. The speed at wich the generator turns determines the frequency of the current. In North America the frequency is 60Hz, wich means that the armature rotates 60 times each second changing direction flow 120 times per second.
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I had this very same question in mind and found an excellent site that explains both DC and AC: http://www.allaboutcircuits.com
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