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Basic Electronics - University of Pennsylvania
Basic Electronics - University of Pennsylvania

... electrons, these are called insulators (air, glass, rubber, most plastics) • Some materials have weak attractions and allow electrons to be lost, these are called conductors (copper, silver, gold, aluminum) • Electrons can be made to move from one atom to another, this is called a current of electri ...
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< 1 ... 1733 1734 1735 1736 1737 1738 1739 1740 1741 ... 2014 >

Alternating current



Alternating current (AC), is an electric current in which the flow of electric charge periodically reverses direction, whereas 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 alternating current in most electric power circuits 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. These types of alternating current carry information encoded (or modulated) onto the AC signal, such as sound (audio) or images (video).
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