Why does your motor spin? You will need your motor and a compass.
The compass is not provided in the Inventions Kit.
You can make a simple compass, if you don’t have one.
to the image on the next slide.
to locate or make a compass.
Place the coil next to the compass. Make sure the coil DOES NOT align with the north pointing needle.
Make sure that the SANDED side
of each lead is in contact
with the paperclips.
What happens to the compass needle? Why does this happen
should move and point at the coil.
This shows that WHEN ELECTRICITY
IS FLOWING through the COIL,
the COIL is an electromagnet.
the ENAMELED side of each lead
is pressed against the paperclips.
to the compass needle now?
press against the paperclips,
no electricity can flow through the coil.
Now, the coil is NOT an electromagnet.
The coil will NOT move the compass needle.
The compass will point north.
it turns to line up with the bar magnet below
and the motion begins.
Just as this happens, the enameled side
of each lead touches the paperclips.
Electricity STOPS flowing through the coil.
The electromagnet is OFF, but the coil is moving
and it keeps on moving (inertia)
long enough for the cycle to repeat.
So half the time the coil is an electromagnet that moves
to line up with the permanent magnet below and half the time
the coil is just coasting. You have made an inertial HALF motor.
OFF again of the coil create motion
that makes your motor move is
PUSH / PULL
between the permanent magnet and the coil,
when it is an electromagnet.
keep on MOVING
when the coil
is no longer an electromagnet
An object in motion
stays in motion
unless acted upon
by an unbalanced force.
Half the time your coil is an electromagnet
and half the time it is just coasting -- INERTIA!
turned it into a SWITCH.
Half the time the coil conducts electricity
and the other half of the time it does not!
a DC electric motor
in your kit.
why did your coil
STAY in motion
into an electromagnet
when it is connected
to your motor and battery
the permanent magnet
and the coil, when it is
the coil makes it act
like a switch. ON. OFF.