The output of an alternator can be represented on a voltage–time graph, with potential difference (voltage) on the vertical axis and time on the horizontal axis. A – The coil is at 0°.

Alternators generate voltage by creating and collapsing magnetic fields. The voltage that is created is in the form of ...

This means that the alternator produces a current that is constantly changing. This is alternating current or ac. The output of an alternator can be represented on a potential difference-time ...