The current changes direction a given number of times a second, which, in the case of standard U.S. power , is 60 times a second. That is to say, they are out of phase with respect to each other. This difference in phase can be used by efficient electrical motors, or ignored, as is the case much of the time when used for lighting or audio. Use of information in this document implies understanding and agreement with the copyright and terms of use . Specifically, no warranty is expressed or implied regarding the accuracy of the information contained within.
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