Definition
A field winding in a DC generator that is connected in series with the armature, so that the entire load current passes through the field coils. Because the field is energized by the load current itself, the magnetic field strength — and therefore the generator output — varies directly with the load.
Plain English
It's the part of a generator where the magnet coils are wired into the same path as the main output wire. The more electricity the aircraft is using, the stronger the magnet gets, and the more the generator pushes out.
Context Anchor
Seen in aircraft electrical system maintenance, DC generator theory, and generator troubleshooting.
Derivation
Series' comes from the Latin 'series' meaning 'a row or chain' — things connected one after another in a single line. In an electrical circuit, components in series share the same current, one after the other. So a 'series field' is a field winding placed in line with the armature, sharing its current.
Why Pilots Care
Pure series-field generators are rarely used as main aircraft generators because their output swings wildly with load changes — an unstable bus voltage is dangerous for avionics. Knowing this helps explain why most aircraft DC generators are shunt or compound types instead.
Grounding Statement
As the aircraft asks the generator for more electrical power, more current flows through the generator series field and changes the strength of the generator’s magnetism.
Intuition Check
Series does not mean a list here, and field does not mean an open area. In this term, series means wired in the same current path, and field means magnetism produced inside the generator.
Example Sentence 1
The technician explained that a generator series field carries the full load current, so output rises and falls with electrical demand.
Example Sentence 2
The compound generator uses its series field to strengthen the magnetic field as electrical load on the aircraft increases.