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Because it is AC, the transmission lines have a characteristic impedance which is the same for any length of line. DC on the other hand cannot easily be converted from one voltage to another. It therefore requires much heavier( therefore more expensive) conductors. DC also presents a problem with electrolysis in switch gear and earthing.
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Alternating Current (AC) vs. Direct Current (DC) - learn.sparkfun
One of the main advantages of AC over DC is that the voltage of alternating current (AC) can be stepped up and down with transformers. This makes it easier to transmit over power lines. Direct current (DC) doesn't change polarity and is better for small, sensitive electronic devices and computers. 10 Pros and Cons of Alternating Current - Green Garage
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Category: essays research papers; Title: Direct and Alternating Current. ... Direct current (dc) comes from generators that do not change in polarity, always ... lot of rivalries; for example, Coke vs Pepsi, PC vs Mac, and most recently Android vs. Direct Current vs Alternating Current | SchoolWorkHelper Westinghouse would also prove that alternating current was superior when they used the .... AC vs DC (Alternating Current vs Direct Current) – Difference and ... Why AC over DC? (Debate/Essay) - Electrical Equipment
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Selecting a Constant Current (CC) DC Welder for Training Purposes Print Article Understanding the personality of a Constant Current (CC) DC welding machine can make the difference between a successful or unsuccessful weld test or between a student who pursues a career in welding and one who may quit in frustration.
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