split ring commutator.
an important term, remember it. it's the part of a DC motor that changes the direction of the current. other important parts include:
power source (battery)
brushes (made of carbon)
magnet
coil
having concave magnets also is better than having just plain straight magnets because there's a wider spread of magnetic field, thus a smoother turning motor.
we did learn a new formula today, it goes:
T = nBIAcos@
where:
T = torque
n = number of turns (loops of the wire in the coil basically)
B = strength of magnetic field in teslas (T)
A = area in m^2
cos@ = angle between plane of coil and the magnetic field. it becomes cos now since it is equal to 1 when the coil is perpendicular to the field
double check whether its perpendicular or parallel..
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