Why Is Alternating Current Preferred for Long-Distance Power Transmission?

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SUMMARY

Alternating Current (AC) is preferred for long-distance power transmission due to its ability to utilize transformers for voltage transformation. This capability allows AC to be stepped up to high voltages, significantly reducing I²R losses in transmission lines. High voltage transmission minimizes current flow, which directly decreases power loss over distances. In contrast, while Direct Current (DC) can also be used, it lacks the efficient voltage transformation capabilities provided by transformers, making AC the superior choice for long-distance electrical power transmission.

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  • Understanding of electrical power transmission concepts
  • Knowledge of transformer operation and functionality
  • Familiarity with I²R loss calculations
  • Basic principles of Alternating Current vs. Direct Current
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  • Research the operation and types of transformers used in AC transmission
  • Study high-voltage transmission line design and efficiency
  • Explore the advantages and disadvantages of Direct Current in power systems
  • Learn about the latest advancements in HVDC (High Voltage Direct Current) technology
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Electrical engineers, power system designers, and students studying electrical engineering who are interested in the principles of power transmission and the comparison between AC and DC systems.

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Why is an alternating current used for long distance transmission of electrical power ?

What about direct current ?
 
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It is because transformers can be used to transform AC voltage to high voltage to reduce power loss in connecting cables. High voltage means less current for the same power and therefore with highg voltage I^2r losses are reduced.
Transformers can then be used to step down the high voltage to safer values for domestic use.
 

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