If we're going to use circuit terminology I think the physics of a flywheel are more like some kind of AC Inductor. DC Inductors resist changes in the flow of c

If we're going to use circuit terminology I think the physics of a flywheel are more like some kind of AC Inductor. DC Inductors resist changes in the flow of current, keeping current flowing even when circuit conditions change. It also helps that the parts of an inductor and flywheel that are in contact with the circuit/grid are coils of wire wrapped around an iron/magnetic core.