PASCO SE-8658A PERMANENT MAGNET MOTOR - Manual (Page 29)

012-07210 A Permanent Magnet Motor
25
wire connected to the +
terminal of the power
supply
When you wrap
your fingers in the
direction of the flow
of the electric
current, your
thumb points
towards the north
pole of the
magnetic field.
+
+
Draw arrows indicating the direction of
current flow.
Indicate which pole is north (N) or south (S). N
Teacher’s Guide
Answers To Questions:
Part A
6. a) Yes.
b) They add together to create a greater effect.
7. No.
8. a) Yes.
b) True.
c) False.
d) The location of the armature’s north pole alternates between ends of the armature as the + lead
touches the alternate sides of the split ring commutator.
e) The current is alternating in the coils because one side of the split ring commutator sends the
current in one direction in the wire, while the other side sends it in the opposite direction in the
wire.
N
N
S
S
Experiment 1:
 Remind students not to prolong situations when the armature is not spinning and the power
is connected—the coils will overheat.
Figure 1. 4, labeled
direction of wire
wrapping on the coil