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AC electrical distribution systems can easily allow changes in voltage using Transformers. This gives AC electrical distribution systems a great advantage compared to DC.

By using transformers, AC power can be changed up to very high voltages for transmission and then changed down again to safer voltages for consumers to use, with comparatively very much less loss of power than DC.

AC has less copper loss (more heating effect) than DC and it's easier and cheaper to produce too.

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The voltage of AC can be easily changed while it's difficult to do so in DC.

Other Factlets
  • AC is usually used for transmission because DC cannot be run through a transformer.
  • Edison's original system was DC. It required many power generating stations because the voltage couldn't be stepped up/down like AC. This is why Westinghouse's (Well, Tesla's IIRC. Westinghouse bought it.) AC system lasted in the long run.
  • Sometimes high voltage DC is used for transmission, but it requires special equipment at both ends.
  • Semiconductor electronics require low voltage DC so your electronic devices have power supplies that change the high voltage AC to low voltage DC.
  • A battery used to store electricity can only store and deliver DC. This is why the basic electrical system used in vehicles is DC.
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15y ago

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