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DC MOTOR (mechanisms (current-carrying coil in a magnetic field…
DC MOTOR
increasing turning effect
increasing current
increasing strength of magnet
increasing number of coils
increasing area of coils
force exerted on wire = magnetic field strength x current x length of wire
reversing rotation
reversing the battery
reversing poles of magnet
mechanisms
current-carrying coil in a magnetic field experiences turning effect
runs on direct current
coil made of insulated copper wire
coil can rotate between poles of magnet
commutator, or split-ring, is fixed to coil and rotates with it
when coil overshoots vertical commutator changes direction of current through it
forces change direction and coil keeps turning
carbon brushes are contacts which rub against the commutator
brushes keep coil connected to battery
maximum turning effect when coil is horizontal
no force when coil is vertical (but commutator always overshoots this position every half turn)