Electromagnetism, Properties Of Waves, Motion, Gases & The Kinetic Theory Worksheet With Answers Page 3
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36The Motor
When current passes through
the coil, a force acts upwards
on one side of the coil, and
downwards on the other side.
N
S
Commutator
The overall effect of these
(split ring)
forces is to make the coil turn
on its axis.
Carbon
brushes
The split ring commutator ensures that the force on any wire on the left hand side
of the motor is always directed upwards, and that the force on the right hand side is
always downwards. This makes sure that the coil turns continuously in one direction.
A
A
N
N
S
S
B
Commutator
B
Question : Match each label (17) to the correct part (ag) for the
simple dc electric motor below :
1. Commutator (Split rings)
a
2. Voltage in
3. Magnetic field
b
4. Motion / Force
c
5. Coil
d
6. Electric current
e
7. Brushes
f
g
.
3
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