mutual inductance
C2Technical / Scientific
Definition
Meaning
The property of two adjacent electrical circuits whereby a changing current in one circuit induces a voltage in the other.
The quantitative measure of the coupling between two circuits due to their magnetic interaction, expressed in henries (H).
Linguistics
Semantic Notes
Refers specifically to the induced electromotive force (EMF) in one coil caused by the rate of change of current in another nearby coil. It is a foundational concept in electromagnetism and transformer theory.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. Spelling conventions follow national norms (e.g., 'inductance' vs. 'inductance' is the same).
Connotations
Identically neutral and technical in both varieties.
Frequency
Equally low-frequency and confined to specialised physics and engineering contexts in both regions.
Vocabulary
Collocations
Grammar
Valency Patterns
The mutual inductance between coil A and coil B is...Mutual inductance is denoted by M.To find the mutual inductance, one must...A changing current creates a voltage via mutual inductance.Vocabulary
Synonyms
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Extremely rare, possibly only in highly technical business contexts like transformer manufacturing or electrical engineering R&D.
Academic
Core term in university-level physics and electrical engineering courses, particularly in electromagnetism and circuit theory modules.
Everyday
Virtually never used in everyday conversation.
Technical
Essential term in electrical engineering, physics, and electronics design, particularly for analysing transformers, inductors, and wireless power transfer.
Examples
By Part of Speech
verb
British English
- The circuits mutually induct.
- The primary coil is inductively coupling to the secondary.
American English
- The circuits are mutually inducing a voltage.
- The coils couple via mutual induction.
adverb
British English
- The coils were mutually inductively coupled.
- The energy was transferred mutually inductively.
American English
- The systems interact mutually inductively.
- They are coupled mutually via inductance.
adjective
British English
- The mutual inductive effect is significant.
- They share a mutual inductance link.
American English
- The mutual inductance value is crucial.
- This is a mutual inductance problem.
Examples
By CEFR Level
- The transformer works because of mutual inductance between its coils.
- If you bring two coils close together, you create mutual inductance.
- The mutual inductance, denoted as M, is calculated from the geometry of the two circuits and their relative orientation.
- Engineers must minimise unwanted mutual inductance between adjacent signal traces on a circuit board to prevent crosstalk.
Learning
Memory Aids
Mnemonic
Think of two people (coils) talking. One person's changing speech (current) causes the other person to respond with a voltage (listening). Their 'MUTUAL understanding' is the MUTUAL INDUCTANCE.
Conceptual Metaphor
CONVERSATION BETWEEN COILS (One coil's changing 'thoughts' (current) influence the 'thoughts' (voltage) of its neighbour).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- The Russian term 'взаимная индуктивность' is a direct translation and is correct.
- Trap: Confusing it with 'самоиндуктивность' (self-inductance). The key is 'взаимная' vs. 'само'.
Common Mistakes
- Pronouncing 'inductance' as /ɪnˈdʊk.təns/ instead of /ɪnˈdʌk.təns/.
- Using 'mutual induction' interchangeably with 'mutual inductance'. The former is the process, the latter is the quantitative measure.
- Forgetting the unit is the henry (H).
Practice
Quiz
What is the standard unit of mutual inductance?
FAQ
Frequently Asked Questions
No. Self-inductance (L) relates to a circuit's own changing magnetic field inducing a voltage in itself. Mutual inductance (M) involves two separate circuits influencing each other.
Yes, the sign of mutual inductance indicates the direction of the induced voltage relative to the reference directions chosen for the currents in the two circuits. A negative M simply implies a certain opposite orientation.
It is the fundamental operating principle of electrical transformers, wireless charging pads, electric motors, generators, and many types of sensors and communication devices.
The size and shape of the coils, the number of turns in each coil, their relative orientation, and the distance between them. It is maximised when coils are coaxial and close together.