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Teacher’s guide, Experiment 1 – PASCO SE-8657 MOTOR ACCESSORY User Manual

Page 33

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012-06247

A

Motor Accessory

29

®

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: north (N) or south (S).

N

Teacher’s Guide

Questions:

Part A

➅ a) Yes.

b) They add together to create a greater effect.

No.

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 direc-
tion 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 4, labeled