What in the world is going on here?
I have a few simple materials. I have a
battery,
I have some wire, then I have a magnet here and above the magnet is a coil of
copper wire. You put all that together and
I have
some really cool things happening.
And believe it or not,
scientists call this an electric motor.
Hi, I am Jared, welcome to Fun Science Demos.
You know a really cool scientist named
Michael Faraday
and he discovered that amazing things
happen when magnetic forces work
with forces that are created with
electricity.
Using science,
he discovered the electric motor.
So I am going to stop this motor so we can
zoom in and really take a closer look at
how
everything works together. So our set-up
for this electric motor is pretty simple.
Everything we use needs to carry
electricity and that electricity must
travel in a circle
scientists call a circuit. So we have a
metal tab,
we have a metal pushpin, we have this
metal wire and we have this coil of
copper.
Everything is metal, and all of those carry
electricity.
Where does the electricity come from?
Well, that is where this battery comes in.
But what is up with this magnet? Well, the
magnet
has a force of its own, and Michael Faraday discovered that when
electricity moves through wire that also
creates a force. Now remember, force
is a push or a pull. So when I have the
force of the magnet
working with the force of the
electricity going through that wire,
all that pushing and pulling makes this
coil of copper spin.
Let us see if we can see those two forces
working together.
So now I am going to try and attach my
battery to create a force. The magnet
already has a force. Let us see if we can
get our motor to work.
And there we go- the push
and the pull of the electric motor. Two
forces
working together. The electric motors we
use today are actually covered up
so you cannot see the magnets and the wire,
that they are there.
This tiny little motor, this electric
motor,
actually has the same parts as our
working motor.
What I would like to do is pull this apart,
zoom in, so you can take a closer look
and see what I am talking about. All I
have to do is
pop this part off and the inside
comes out. Now I will set this down.
What does this look like to you? That is
coils
of copper wire. And if you look carefully,
inside this metal frame
are two magnets. Magnets and copper wire,
magnet, copper wire. All I need is
electricity
and this motor will spin. We use electric
motors really
all over in so many different places. But
remember,
that motor is usually covered up so you
cannot see the copper wire and you cannot see
the magnets.
This drill actually uses an electric
motor.
If you pick it up it is a little bit heavy.
Why? It is all those magnets and copper
wire.
You cannot see it because it is covered up.
But my drill is not working. What do I need?
Well, the magnets are in there but it
needs
a battery. So my drill does not work because
it does not have a battery.
My battery supplies the electricity and
it makes my motor spin.
So when I take my battery and put it
into my drill,
I should now have electricity moving
through that copper wire
which works with the forces of the
magnet to make my motor spin. When my
motor spins,
this drill bit should spin too. Three,
two, one:
(whirring) the electric motor works. Amazing!
Think about all the great things we use
today
because Michael Faraday made such a cool discovery about how
the force of electricity works with the
force of a magnet
to create the electric motor. If you want
to learn more about electricity,
motors and magnets, check out our link in
the video description. Science is so cool.
Thanks for watching.
 
