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Electric Energy, 3rd Edition by Mohamed A. El-Sharkawi

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Chapter 7

Alternating Current Circuits

Nikola Tesla proposed the alternating current (ac) system as a better alternative to the direct current (dc) system. His idea was initially met with fierce resistance from Thomas Edison as explained in Chapter 1. Eventually the ac was selected for power systems worldwide essentially because of three main reasons:

  1. The voltage of the ac system can be adjusted by transformers, which are relatively simple devices.
  2. The voltage of the long transmission lines can increase to high levels; thus reducing the current of the line, reducing the transmission line losses, and reducing the cross section of the conductors of the transmission lines.
  3. The ac systems produce rotating magnetic fields that spin electric motors. ...

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