Question 1 · Quick check
commutator
CEFRC2
/ˌkɑmjəˈteɪtˈɔr/
noun
Türkçe translations
Translating…
In plain English
- 01
noun
A device that changes the direction of electric current in a motor.
- 02
noun
Extra detailA binary map in a given group G, given by [g, h] = ghg⁻¹h⁻¹, where g and h are elements of G, which yields the group's identity if and only if the group operation commutes for g and h.
Examples
The technician repaired the worn commutator of the electric motor.
The commutator controlled the electric current.
At a glance
Sits at C2 on the CEFR scale
- Senses
- 4
- Parts of speech
- 1
Deep Dive
noun
Extra meaningsAn electrical switch, in a generator or motor, that periodically reverses the direction of an electric current.
A binary map in a given ring R, given by [a, b] = ab − ba, where a and b are elements of R, which yields the ring's zero element if and only if the multiplication operation commutes for a and b.
More examples
In contextHe designed a new commutator system.
Quick test
Two questions on this entry. Nothing is scored.
Practise this properly in the app, where the word comes back before you forget it.
Nearby
Origin
noun
Back-formation from commutation (in the late 19th century), as is commutate (verb) too.