field current
C1/C2Formal, Technical
Definition
Meaning
In physics and electrical engineering, the electric current used to generate the main magnetic field in a motor, generator, or electromagnet.
A specialized technical term referring to the excitation current in a machine's field windings. This concept extends metaphorically in non-technical contexts to refer to a core, foundational, or driving force within a domain.
Linguistics
Semantic Notes
The term is almost exclusively a noun phrase compound, used in singular or plural form. It refers to a specific type of current distinguished from 'armature current'. In metaphorical extension, it implies a source of energy or motivation.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Spelling conventions follow regional norms for related technical documentation.
Connotations
None beyond the technical meaning. The term carries identical technical precision in both dialects.
Frequency
Equally low-frequency in both dialects, restricted to electrical engineering and physics contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
The [machine] requires a [stable] field current.Adjust/Control/Regulate the field current to [achieve X].A loss of field current causes [failure].Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “[Metaphorical] He is the field current of the project, providing the driving energy.”
- “[Technical] Running without field current.”
Usage
Context Usage
Business
Rare, except in businesses selling or servicing electrical machinery.
Academic
Common in electrical engineering, physics, and related technical textbooks and papers.
Everyday
Virtually never used.
Technical
The primary domain. Precisely defined in schematics, manuals, and engineering discussions.
Examples
By Part of Speech
verb
British English
- The technician will field-current the generator after the repair. (Extremely rare/neologism)
American English
- They need to field-current the motor before testing. (Extremely rare/neologism)
adjective
British English
- The field-current regulator is faulty. (Compound adjective use)
American English
- Check the field-current supply circuit first. (Compound adjective use)
Examples
By CEFR Level
- The machine needs electricity to work.
- In a simple motor, the field current creates a magnetic field.
- The stability of the generator's output voltage is directly dependent on maintaining a constant field current.
- A sudden drop in field current can lead to a loss of excitation and system collapse.
Learning
Memory Aids
Mnemonic
Think of a football FIELD. The players (electrons) running to create the game (magnetic field) are the FIELD CURRENT.
Conceptual Metaphor
FOUNDATION IS A MAGNETIC FIELD (The core enabling force is like the current that creates a magnet).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid translating 'field' as 'полевой' in the sense of 'related to fieldwork'. Here it's 'поле' as in magnetic field.
- Do not confuse with 'ток поля' (which is ambiguous). The established term is 'ток возбуждения'.
- The English compound 'field current' is a fixed technical term, not a free phrase.
Common Mistakes
- Using 'field' as an adjective (e.g., 'field's current') – it's a noun modifier in a compound.
- Confusing it with 'field of current' (a different concept).
- Pronouncing it as a run-on phrase without the compound stress pattern /ˈfiːld ˌkʌr.ənt/.
Practice
Quiz
What is the primary function of a field current?
FAQ
Frequently Asked Questions
No. It is a specific, controlled current used inside machines like motors and generators to create their internal magnet, not the general power supply.
Almost never. It is a highly technical term specific to electrical engineering and related fields.
The generator loses its magnetic field (excitation) and can no longer produce an output voltage, potentially causing a power failure.
Imagine the field current as the electricity you apply to an electromagnet's coil. Without it, there is no magnetism to make the motor spin or the generator produce power.