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Old 27-01-2013, 08:36
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Join Date: Nov 2010
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Now that is an interesting area that I don't know about - How did Edison generate his DC? Did he generate AC and then rectify it into DC? That would be very inefficient.
I would think that his generator would be in the form of a dynamo (as opposed to an alternator). A dynamo makes use of a commutator (just like a dc motor) to switch the direction of current so that it doesn't alternate.

Dynamos were commonly used in cars for battery-charging purposes, until they eventually got replaced by alternators (this change being made possible by the advent of cheap solid-state rectifiers).
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