Ac theory notes. I = I 0 sin ωt or I = I 0 cosωt where, I 0 = peak value or maximum value of AC. The EMF and current vary as the sine function of the phase angle and complete positive, negative, and zero cycles over time. AC Theory - History Edison and Westinghouse Edison favored DC power distribution, Westinghouse championed AC distribution. The objective of these notes is to introduce various ideasofACcircuits,withsu彾䋓cientmathematicalrigour,yetwithoutcloudingthestudents’mind. AC THEORYWhen a battery is connected to a circuit the current flows steadily in one direction, this is called a Direct current (d. In order to maintain the flow of current the applied voltage must be - Page 01 Alternating current (A. Alter AC stands for “Alternating Current,” meaning voltage or current that changes polarity or direction, respectively, over time. pdf), Text File (. Ideal for technical training and education. AC and DC motor design follows respective generator design principles very closely. xsfcch djsykhj uxm quvqmu vcrk imorcxxu cfwa ayjbuwk fkmsui rlmoyn