'''Alternating current''' (commonly abbreviated '''AC''') is a characterization of electricity in which the [[voltage]] or [[current]] changes rapidly. (Except in unusual circumstances, if the voltage changes the current changes and vice-versa; however, the term "alternating current" is always used to describe this situation.) If the voltage is constant, the situation is called [[direct current]] or '''DC'''. | '''Alternating current''' (commonly abbreviated '''AC''') is a characterization of electricity in which the [[voltage]] or [[current]] changes rapidly. (Except in unusual circumstances, if the voltage changes the current changes and vice-versa; however, the term "alternating current" is always used to describe this situation.) If the voltage is constant, the situation is called [[direct current]] or '''DC'''. |