2. Direct current (DC) sources
2.1 Imposed voltage
Why impose voltage for DC transmission? First of all, the idea came naturally to electricians who, as early as the 19th century, had been using near-constant DC voltage sources: batteries, accumulators, dynamos...
The physical law is more imperative. Consider a generator with electromotive force E, internal resistance r, output voltage U, and current I. We write that :
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Direct current (DC) sources
Alternating current (AC) sources
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