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High-voltage direct current - Wikipedia
Alternating current - Wikipedia
What’s the difference between AC and DC? - Mit Engineering
Alternating Current (AC) vs. Direct Current (DC) - SparkFun Learn
The Benefits of High-Voltage Direct Current (HVDC) Power
20.5: Alternating Current versus Direct Current - Physics LibreTexts
20.5 Alternating Current versus Direct Current - OpenStax
Understanding Voltage Sources: Principles and Applications
High-Voltage Direct Current - an overview | ScienceDirect Topics