# Potential difference in AC circuits

What exactly creates the potential difference between the terminals of an AC source? In DC, an electrochemical cell causes charges to be moved within the cell from one electrode to the other and this work done on it is stored as its potential energy

I know that the basic principle of an alternating source of current is the changing magnetic flux linked with a conducting coil that is being rotated in the field. So what creates the potential difference in the circuit. Essential what part of the coil represents the analogous positive and negative terminals in DC circuits.

• Is this just asking how an AC generator works? Have you attempted to research this, and if so can you give us some idea what specific aspects of it are unclear? Commented Aug 9, 2016 at 13:44
• Back at the power plant, a changing magnetic field induces an electric field in a coil of wire. That electric field drives motion of electrons, which is a current. That current is representative of an establishment of a potential difference
– Jim
Commented Aug 9, 2016 at 13:45
• @John Rennie In a DC source, there is a positive and negative terminal for a cell. What is the equivalent in an AC source. Which part of the coil acts as a positive terminal and which the negative. Commented Aug 9, 2016 at 14:59
• @LeroyJD , do a bit of research on electromagnetic induction, as shown in the following link: en.wikipedia.org/wiki/Electromagnetic_induction Commented Aug 9, 2016 at 15:36
• I'm voting to close this question as off-topic because of insufficient research effort. Commented Aug 9, 2016 at 18:35