Magnet + Electricity
exhibit demonstrates the principles by which a motor functions.
Closing a switch permits electricity to flow through the coils of
wire wound around the motor shaft, called an armature. Holding a
magnet around the coil causes the motor to turn. All motors operate
for the same basic reason: When electricity flows through a wire
and a magnet is nearby, the magnet exerts a force on the wire. Without
either the magnet or the electricity, there is no "push"
to make the motor turn. Turning the magnet overreversing its
magnetic fieldreverses the "push" and causes an