Not every relation is a function. But every function is a relation. Function is just a part of relation.
The cubic function.
Range
A formula or graph are two ways to describe a math function. How a math function is described depends on the domain of the function or the complexity of the function.
The Mandelbrot graph is generated iteratively and so is a function of a function of a function ... and in that sense it is a composite function.
The most common use of brushes and commutators these days are in universal motors. This type of motor is used in hand tools like drills, saws, and home motor driven appliances
brushes
brushes
brushes
north and south magnets, a coil, commutators, output, and a handle LOL
no such thing, starters have commutators alternators have Slip ring.... or slip ring end when referring to directions
DC motors generally use commutators. Also some single phase AC motors use commutators. They are the type which which have their field windings connected in series with their armatures and they can typically be found in home vacuum cleaners, DIY-type ac electric drills, etc.
DC GERATORS PRODUCE DC current with the help of spilt ring commutators.
The brush holder in an alternator keeps the brushes held to slip rings with spring pressure (or commutators in generators or some motors) which provide electrical contact to electromagnets in the spinning rotor. By varying the electrical current through the brushes to the rotor magnets, you can adjust the power output of the alternator as needed.
These springy pieces are called brushes. They conduct current between stationary wires and moving parts in the electromagnet, ensuring continuous contact with the commutator's contacts as it rotates.
The fundamental group of a closed orientable surface of genus g is the quotient of the free group on the 2g generators a1,...,ag,b1,...,bg by the normal subgroup generated by the following product of g commutators: a1b1a1-1b1-1...agbgag-1bg-1.
Function