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لینک پرداخت و دانلود *پایین مطلب * فرمت فایل :Word ( قابل ویرایش و آماده پرینت ) تعداد صفحه۸ City lights viewed in a motion blurred exposure. The AC blinking causes the lines to be dotted rather than continuous. 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 History William Stanley, Jr. desig …
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