All right so today we're going to go over the basics of electricity what it
is and why it is and why we might have a benefit for it. So electricity is
basically the flow of a very special particle, it's not particularly that
special, they all over the place. They're called electrons. They're part of an atom.
They're the outer portion of an atom orbiting around the core, or the nucleus.
And those little particles will flow past other atoms through anything that
will conduct them. That you can carry those electrons through, and by having
that flow occur we can do some work. We can light some lights, we can run some
motors, things like that. That's basically what current is, electrical flow. Now in
order to get these electrons to flow, and we're to remember we're just doing to
recap here, so in order to get these electrons to flow we have to have some
sort of a push. You got to push these things to go, you have marbles on a table
you give them a little shove, in order to do that you got to push it, that's going
to be called voltage or pressure. (And it's named after a guy, which you know
he's been recognized enough we're not going to go over that here.) So, we
call it voltage or volts, so you apply a pressure to some electrons again to move
that's called voltage or volts. Okay? Clear so far?
I'm gonna check with somebody here in the room. [Person in room]: Yeah! [Back to Speaker]: Excellent
Okay the next thing I think we should go over, would be what might slow that flow
or keep it from going entirely? And that's called resistance. That's
something that's stopping that flow from occurring, so electrons want to move
through or applying a pressure a voltage we're trying to get this current going
and there's an obstacle for that current to flow. That obstacle is called
resistance, and it can be a greater or lesser amount. It can be very little, in
which case a lot of flow can happen. It can be a great deal in which case very
little flow can happen. Make sense? [Person in room]: Mhmm. [Back to speaker]: Excellent! Then we want to talk about
load. Load, what is load? Well, that's what we're trying to run these electrons
through, to get some work done. So if we're pumping electrons, we're pushing them
through with some voltage and you got this flow of electrons going through
something like a light bulb, now we'll see: oh the light starts to light! Because
those electrons are jumping through there it's going: Whoa! check it out! And
start to light up! That's called a load, the thing we're trying to run. Now
technically anything, any kind of resistance in that path would be
considered a load. It's going to, it's going to generate certain amount of heat
and stuff like that just from having resistance and slowing down this flow.
And that would all be called a load, but the main thing we're worried about in
electrical when we're dealing with buildings and wiring circuits and things
like that, is we're worried about the thing we're trying to operate. The thing
we're trying to make do work for us, and that would be a motor a light bulb
something like that. So that's what we call a load, and it could be anything. I
mean look around your house look around the office here anything, like that
you'll find things that are you know the-- coffee machine is a load. The light
fixtures are loads, the pencil sharpeners a load, all those things are loads and
they all require a certain amount of energy to operate properly. So we have to
have a certain amount of push..voltage and a certain amount of flow, which will
get the work done. And that's, that's it. Okay so, when we're looking at these
electrons flow. Now we've just gone over the basics of what's happening and
really if you just look at, it's always a flow. That's what we're dealing with with
electricity. We are worried about flows you'll hear people talk about 'Oh there's this,
what if there's just electricity there and there's no flow happening?' Well why
worry about it? You know now we're getting into silly stuff. It's like we're
interested in the flows! What's happening? That's what we want to control, that's
what we're trying to do, get factories moving and stuff like that that's what
we're trying to do. It's lights on so people can work, get machines running. So
we're interested in the flows of electrons, not whether or not they're
static or blah blah blah. Okay, everybody good with that? [Person in room]: Mhmm. [Back to speaker]: Okay, so now let's look at the
fundamentals of how this is all put together. So I'm gonna go to this board
here. Pardon me for my spelling I will write very little, but I'm going to more
do a sketch of... Here is.. We're going to call this a source, and I'm going to add
letters and stuff as needed. So that's the power source, that will give us power.
This will apply the voltage to the system. It will have electrons
available and it'll have wires that also have electrons available, to flow. Okay? So
right now we're going to have some pressure going this way. Right? It's going
to be pushing on that wire. So as it pushes through this wire goes over here
too, and we're just going to call this a load. There's our load. Okay? So the curve
the electrons flowing through here, will go flow through the load. Now they just
stopped there's nothing here! Well we've got to come back to the
source, so now we have it's like a pump. This thing is pumping electrons this way
and then it's sucking them back this way. And it continues to do this cycle
pumping electrons through this and this light bulb lights up and glows. This we
call a circuit. You see how it's a circuit? It loops from here , a
starting point, goes all the way through and it comes back to that starting point
again. And inside it's actually going through there and going back again, doing
it again. It keeps repeating. Now this could be a battery. It can be a generator. It can be anything like that, but just to keep it simple: It's just the power
source. It's creating a pressure, a voltage, to push electrons through this
circuit and that's it. [End Video]