induction coil
C2/AdvancedTechnical / Historical / Engineering
Definition
Meaning
An electrical device that produces high-voltage pulses from a low-voltage direct current (DC) supply, using the principle of electromagnetic induction.
Historically, a key component in early radio, automotive ignition systems, and medical equipment like electrotherapy devices. It represents a specific application of transformer principles.
Linguistics
Semantic Notes
The term is now largely historical or found in specific technical contexts (e.g., describing vintage equipment). The core function is subsumed by more modern components like ignition coils (in cars) or high-frequency transformers. It inherently implies a *step-up* transformer.
Dialectal Variation
British vs American Usage
Differences
No major lexical differences. Spelling of related terms may follow regional conventions (e.g., 'centre' vs. 'center').
Connotations
Slightly stronger historical/educational connotation in the UK (associated with Michael Faraday). In the US, it may have a stronger association with early automotive technology.
Frequency
Equally low frequency in both dialects, confined to technical and historical discourse.
Vocabulary
Collocations
Grammar
Valency Patterns
The [induction coil] [produces/generates] [a spark/high voltage].A [spark/voltage] is [generated/produced] by the [induction coil].Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “Like an induction coil – describing something that builds up energy for a sudden release.”
Usage
Context Usage
Business
Extremely rare. Possibly in historical business case studies of technology companies.
Academic
Used in history of science, physics, and electrical engineering courses when covering foundational principles.
Everyday
Virtually never used. A layperson might say 'ignition coil' for a car part.
Technical
Used accurately in engineering, restoration of antique electrical devices, and historical technical documentation.
Examples
By Part of Speech
verb
British English
- The circuit was designed to induction-coil the voltage for the spark plug.
- (Note: This is a highly non-standard, technical neologism for illustration)
American English
- The mechanic said we need to induction-coil a higher voltage for the old engine. (Non-standard)
adverb
British English
- The voltage increased induction-coil rapidly. (Non-standard)
American English
- It sparked induction-coil style. (Non-standard)
adjective
British English
- The induction-coil mechanism was patented by Ruhmkorff.
- He studied induction-coil theory.
American English
- The induction-coil design is obsolete.
- An induction-coil apparatus was on display.
Examples
By CEFR Level
- This old machine has an induction coil. (Labelled picture)
- An induction coil can make a small battery produce a big spark.
- The scientist demonstrated electromagnetic induction using a simple induction coil and a magnet.
- Although largely superseded by solid-state electronics, the induction coil remains a quintessential demonstration device for teaching Faraday's law of induction.
Learning
Memory Aids
Mnemonic
Think INDUCTION (the process) + COIL (of wire). It 'induces' a high voltage in one coil of wire from a current in another coil.
Conceptual Metaphor
A PRESSURE AMPLIFIER FOR ELECTRICITY (taking low 'pressure' current and creating high 'pressure' sparks).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid translating 'induction' as 'индукция' in the sense of 'job induction' (вводный инструктаж). Here it's purely 'электромагнитная индукция'.
- Do not confuse with 'катушка зажигания' (ignition coil) which is a specific modern application; 'induction coil' is the broader, original term.
Common Mistakes
- Pronouncing 'induction' as /ɪnˈdʊk.ʃən/.
- Confusing it with a general 'transformer' (an induction coil is a specific *type* of transformer).
- Using it to refer to modern electronic components like solid-state inverters.
Practice
Quiz
What is the primary physical principle an induction coil relies on?
FAQ
Frequently Asked Questions
Yes, an induction coil is a specific type of transformer, specifically a step-up pulse transformer designed to produce intermittent high-voltage pulses from a DC source.
Most commonly in museums, physics teaching laboratories as a demonstration tool, in the ignition systems of very old cars (pre-electronic ignition), or in the restoration of antique radio and medical equipment.
The interrupter rapidly makes and breaks the primary circuit's direct current. This changing current is necessary to create the varying magnetic field that induces the high voltage in the secondary coil.
It was a crucial device for generating the high voltages needed for early experiments with X-rays, radio waves (by Hertz and Marconi), and gas-discharge tubes, helping to usher in the age of electrical and electronic technology.