In a DC series generator, when does current flow?

In a DC series generator, current flow is directly related to the load connected to the circuit. When there is a load applied, the generator produces voltage that drives current through the circuit. The more load that is applied, the more current flows through the generator. This is because, in a series configuration, the field winding is connected in series with the armature winding. As current flows through the field winding, it generates a magnetic field that induces voltage in the armature.

If the generator is unloaded, there will be little to no current flowing because there is no resistance in the circuit for the current to overcome, leading to a situation often referred to as "no-load" condition. Without a load, the generator does not effectively produce useful power.

During startup, while current may flow momentarily to get the generator running, it's not sustained as the generator needs to be under load to generate continuous current effectively. Similarly, the statement regarding stable voltage does not guarantee current flow, as the current is dependent on the presence of a load.

Thus, the presence of a load is essential for sustained current flow in a DC series generator, making it clear that current flows when there is a load connected.