The end result is the fact that a little DC exciter existing indirectly controls the output of the main alternator.[22] [13] The introduction of transformers within the mid-1880s led to the prevalent usage of alternating present and the use of alternators desired to supply it.[14] Just after 1891, polyphase alternators https://high-speed-energy-ceiling00975.suomiblog.com/the-basic-principles-of-alternator-51092480