[Script Info]
Title: 
[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:01.75,0:00:04.07,Default,,0000,0000,0000,,Alright today we're going to take a look at the
Dialogue: 0,0:00:04.09,0:00:06.98,Default,,0000,0000,0000,,Conair 1875 hair dryer.We're going to look at the different systems
Dialogue: 0,0:00:06.98,0:00:09.17,Default,,0000,0000,0000,,and functions inside of it, how it was made and
Dialogue: 0,0:00:09.19,0:00:12.09,Default,,0000,0000,0000,,how it works.
Dialogue: 0,0:00:12.09,0:00:14.66,Default,,0000,0000,0000,,And we're also going to take a look at how they
Dialogue: 0,0:00:14.72,0:00:17.34,Default,,0000,0000,0000,,were able to produce a hair dryer for less than
Dialogue: 0,0:00:17.34,0:00:19.86,Default,,0000,0000,0000,,$8.00 and still make a profit and still stay in
Dialogue: 0,0:00:19.86,0:00:22.13,Default,,0000,0000,0000,,business as a company because that's a very low
Dialogue: 0,0:00:22.13,0:00:24.21,Default,,0000,0000,0000,,price and the way low price. And the way they've
Dialogue: 0,0:00:24.21,0:00:27.07,Default,,0000,0000,0000,,done that is they've reduced a lot of cost and
Dialogue: 0,0:00:27.07,0:00:29.13,Default,,0000,0000,0000,,complexity and we'll take a look at how they've
Dialogue: 0,0:00:29.13,0:00:31.11,Default,,0000,0000,0000,,done that. So the first thing I want to take a look at is
Dialogue: 0,0:00:31.11,0:00:33.45,Default,,0000,0000,0000,,the plug here. This is called a "ground fault
Dialogue: 0,0:00:33.47,0:00:36.05,Default,,0000,0000,0000,,interruptor circuit plug" and it has two different
Dialogue: 0,0:00:36.05,0:00:38.05,Default,,0000,0000,0000,,sized prongs right here. There's a larger prong and
Dialogue: 0,0:00:38.05,0:00:40.10,Default,,0000,0000,0000,,a smaller prong. And that's very important.
Dialogue: 0,0:00:40.12,0:00:42.31,Default,,0000,0000,0000,,The larger prong is the neutral prong and that
Dialogue: 0,0:00:42.31,0:00:44.90,Default,,0000,0000,0000,,means you can't plug this in incorrectly, it has to go in
Dialogue: 0,0:00:44.90,0:00:47.64,Default,,0000,0000,0000,,in only one way. And that means that the power
Dialogue: 0,0:00:47.64,0:00:52.26,Default,,0000,0000,0000,,is grounded properly. So the power always goes
Dialogue: 0,0:00:52.26,0:00:55.74,Default,,0000,0000,0000,,to ground and that's a critical thing in a circuit
Dialogue: 0,0:00:55.74,0:00:59.08,Default,,0000,0000,0000,,like this. So what this plug does it's actually pretty
Dialogue: 0,0:00:59.08,0:01:02.34,Default,,0000,0000,0000,,smart it can tell if there's a power difference
Dialogue: 0,0:01:02.34,0:01:04.60,Default,,0000,0000,0000,,between these two prongs. And that power difference
Dialogue: 0,0:01:04.60,0:01:07.41,Default,,0000,0000,0000,,might occur when the hair dryer was, say, dropped
Dialogue: 0,0:01:07.41,0:01:10.54,Default,,0000,0000,0000,,in water or there was some sort of short that
Dialogue: 0,0:01:10.54,0:01:13.85,Default,,0000,0000,0000,,happened. Inside the hair dryer there are open
Dialogue: 0,0:01:13.85,0:01:16.54,Default,,0000,0000,0000,,electrical contacts that if they're put into water
Dialogue: 0,0:01:16.54,0:01:20.56,Default,,0000,0000,0000,,or some other conductive fluid they'll short out.
Dialogue: 0,0:01:20.56,0:01:23.44,Default,,0000,0000,0000,,And it will cause the, you know, it'll electrify the fluid.
Dialogue: 0,0:01:23.44,0:01:26.01,Default,,0000,0000,0000,,And in the past that was a huge problem because
Dialogue: 0,0:01:26.03,0:01:28.67,Default,,0000,0000,0000,,people would get schocked or electrocuted and now
Dialogue: 0,0:01:28.67,0:01:30.86,Default,,0000,0000,0000,,it's not as big a deal because we have these ground
Dialogue: 0,0:01:30.86,0:01:33.62,Default,,0000,0000,0000,,fault interruptor circuits. So let's take a look at what's
Dialogue: 0,0:01:33.62,0:01:35.84,Default,,0000,0000,0000,,inside of that. And I've already popped this apart to
Dialogue: 0,0:01:35.84,0:01:38.40,Default,,0000,0000,0000,,some degree. I'm going to see if I can get it the rest
Dialogue: 0,0:01:38.40,0:01:40.83,Default,,0000,0000,0000,,of the way here. Now I want to say one thing really
Dialogue: 0,0:01:40.83,0:01:44.50,Default,,0000,0000,0000,,quick here from a safety stand point:
Dialogue: 0,0:01:44.51,0:01:49.11,Default,,0000,0000,0000,,It's absolutely critical that you DON'T take apart
Dialogue: 0,0:01:49.11,0:01:52.42,Default,,0000,0000,0000,,any plugs ever without a professionnal! And if you do
Dialogue: 0,0:01:52.42,0:01:56.74,Default,,0000,0000,0000,,have a professional and you do end up taking apart
Dialogue: 0,0:01:56.74,0:02:01.64,Default,,0000,0000,0000,,a plug like this make sure that you never ever
Dialogue: 0,0:02:01.64,0:02:04.55,Default,,0000,0000,0000,,plug it in! It's totally unsafe. So this is a plastic
Dialogue: 0,0:02:04.55,0:02:08.26,Default,,0000,0000,0000,,moulded housing it was injection moulded.
Dialogue: 0,0:02:08.26,0:02:11.80,Default,,0000,0000,0000,,There were two pieces of steel that came together
Dialogue: 0,0:02:11.80,0:02:15.08,Default,,0000,0000,0000,,and the molten plastic was injected and you can see
Dialogue: 0,0:02:15.08,0:02:17.46,Default,,0000,0000,0000,,there are little pin marks right here. And pins came in
Dialogue: 0,0:02:17.46,0:02:20.08,Default,,0000,0000,0000,,inside the mold and pushed this part out.
Dialogue: 0,0:02:20.08,0:02:21.94,Default,,0000,0000,0000,,And then there's a little plastic piece here with a
Dialogue: 0,0:02:21.94,0:02:23.50,Default,,0000,0000,0000,,spring and that's for the test switch.
Dialogue: 0,0:02:23.50,0:02:25.48,Default,,0000,0000,0000,,So the test switch pushes on this part right here
Dialogue: 0,0:02:25.48,0:02:29.14,Default,,0000,0000,0000,,on the printed circuit board and the reset switch
Dialogue: 0,0:02:29.15,0:02:31.34,Default,,0000,0000,0000,,is right here. So you push on the reset switch
Dialogue: 0,0:02:31.34,0:02:33.76,Default,,0000,0000,0000,,and it will reset it so if it gets triggered you can still
Dialogue: 0,0:02:33.76,0:02:38.03,Default,,0000,0000,0000,,use your hair dryer again later.
Dialogue: 0,0:02:38.03,0:02:42.47,Default,,0000,0000,0000,,So one thing I want to take a look at here is the
Dialogue: 0,0:02:42.47,0:02:46.10,Default,,0000,0000,0000,,printed circuit board here. So we've got a lot of
Dialogue: 0,0:02:46.10,0:02:48.50,Default,,0000,0000,0000,,really cool things happening on this printed circuit
Dialogue: 0,0:02:48.50,0:02:51.66,Default,,0000,0000,0000,,board. It is made out of fiberglass.
Dialogue: 0,0:02:51.66,0:02:53.85,Default,,0000,0000,0000,,It's got a thin layer of copper applied to it.
Dialogue: 0,0:02:53.85,0:02:56.49,Default,,0000,0000,0000,,And then on top of the copper is a layer of lacquer.
Dialogue: 0,0:02:56.49,0:02:58.91,Default,,0000,0000,0000,,(The copper) Before they put the copper layer down
Dialogue: 0,0:02:58.91,0:03:01.15,Default,,0000,0000,0000,,they actually etch away parts of the copper. So
Dialogue: 0,0:03:01.15,0:03:03.06,Default,,0000,0000,0000,,there's places where there is no copper and there's
Dialogue: 0,0:03:03.06,0:03:05.42,Default,,0000,0000,0000,,places where there is. And those places where the
Dialogue: 0,0:03:05.42,0:03:07.57,Default,,0000,0000,0000,,copper exists are called traces and they function
Dialogue: 0,0:03:07.57,0:03:10.26,Default,,0000,0000,0000,,like little tiny wires. They're supper flat and compact
Dialogue: 0,0:03:10.26,0:03:12.95,Default,,0000,0000,0000,,and allow you to get a lot of stuff in a very
Dialogue: 0,0:03:12.95,0:03:15.69,Default,,0000,0000,0000,,small space. Which is why we use a little
Dialogue: 0,0:03:15.69,0:03:18.57,Default,,0000,0000,0000,,printed circuit board like this. And you can see on
Dialogue: 0,0:03:18.57,0:03:21.44,Default,,0000,0000,0000,,here we've got a little tiny capacitor that's called a
Dialogue: 0,0:03:21.44,0:03:24.47,Default,,0000,0000,0000,,surface mount capacitor and a little resistor.
Dialogue: 0,0:03:24.47,0:03:27.04,Default,,0000,0000,0000,,Remember a capacitor stores a charge and then
Dialogue: 0,0:03:27.04,0:03:29.49,Default,,0000,0000,0000,,releases it and a resistor will resist current flow
Dialogue: 0,0:03:29.49,0:03:32.17,Default,,0000,0000,0000,,and that can be used to protect different parts of the
Dialogue: 0,0:03:32.17,0:03:34.08,Default,,0000,0000,0000,,circuit. And this right here is
Dialogue: 0,0:03:34.08,0:03:39.55,Default,,0000,0000,0000,,this part right here is called and integrated circuit.
Dialogue: 0,0:03:39.55,0:03:43.57,Default,,0000,0000,0000,,And it actually takes commands from things on the
Dialogue: 0,0:03:43.57,0:03:47.79,Default,,0000,0000,0000,,back takes information from things on the back
Dialogue: 0,0:03:47.79,0:03:51.86,Default,,0000,0000,0000,,and decides what to do with it.
Dialogue: 0,0:03:51.86,0:03:56.24,Default,,0000,0000,0000,,So this thing right here is called a toroidal ring
Dialogue: 0,0:03:56.24,0:03:59.55,Default,,0000,0000,0000,,or a copper coil and it basically can sense the
Dialogue: 0,0:03:59.55,0:04:02.44,Default,,0000,0000,0000,,difference between these two lines.
Dialogue: 0,0:04:02.44,0:04:04.96,Default,,0000,0000,0000,,And so when there's a significant voltage difference
Dialogue: 0,0:04:04.96,0:04:07.77,Default,,0000,0000,0000,,a few milliamps even
Dialogue: 0,0:04:07.77,0:04:10.22,Default,,0000,0000,0000,,it can tell and it sends information to the
Dialogue: 0,0:04:10.22,0:04:13.97,Default,,0000,0000,0000,,integrated circuit here. And then the integrated circuit
Dialogue: 0,0:04:13.97,0:04:19.22,Default,,0000,0000,0000,,tells this guy which is called a solenoid
Dialogue: 0,0:04:19.22,0:04:22.61,Default,,0000,0000,0000,,it's a linear solenoid.
Dialogue: 0,0:04:22.61,0:04:26.35,Default,,0000,0000,0000,,But it sends electricity to this and it causes this pin
Dialogue: 0,0:04:26.35,0:04:28.90,Default,,0000,0000,0000,,to pop. And when the pin pops, it breaks the circuit
Dialogue: 0,0:04:28.90,0:04:31.30,Default,,0000,0000,0000,,the electrical contact, the connection in the circuit.
Dialogue: 0,0:04:31.30,0:04:33.81,Default,,0000,0000,0000,,So there's no chance that you can get shocked there.
Dialogue: 0,0:04:33.81,0:04:36.32,Default,,0000,0000,0000,,And there's a couple of really neat interesting parts
Dialogue: 0,0:04:36.32,0:04:38.70,Default,,0000,0000,0000,,on this board. We've got a
Dialogue: 0,0:04:38.70,0:04:41.02,Default,,0000,0000,0000,,this is a dialectric capacitor.
Dialogue: 0,0:04:41.02,0:04:43.64,Default,,0000,0000,0000,,And then we have another capacitor right here.
Dialogue: 0,0:04:43.64,0:04:46.23,Default,,0000,0000,0000,,And you can see right here this is a ceramic
Dialogue: 0,0:04:46.23,0:04:48.62,Default,,0000,0000,0000,,capacitor this little sort of rust colored one.
Dialogue: 0,0:04:48.62,0:04:51.20,Default,,0000,0000,0000,,I'll take this out so you can see it better.
Dialogue: 0,0:04:51.20,0:04:54.35,Default,,0000,0000,0000,,And this is called a transistor so it can function
Dialogue: 0,0:04:54.35,0:04:58.54,Default,,0000,0000,0000,,like a switch in a circuit. And this is called a
Dialogue: 0,0:04:58.54,0:05:03.13,Default,,0000,0000,0000,,varistor or a variable resistor and it can protect the
Dialogue: 0,0:05:03.13,0:05:08.44,Default,,0000,0000,0000,,circuit from high voltages and things like that.
Dialogue: 0,0:05:08.44,0:05:11.67,Default,,0000,0000,0000,,It's a non-linear resistor in other words as the
Dialogue: 0,0:05:11.67,0:05:14.22,Default,,0000,0000,0000,,current flow changes the resistance changes and so
Dialogue: 0,0:05:14.22,0:05:16.39,Default,,0000,0000,0000,,it can protect your circuitry there.
Dialogue: 0,0:05:16.39,0:05:21.83,Default,,0000,0000,0000,,And if you look on the inside you can see the
Dialogue: 0,0:05:21.83,0:05:25.07,Default,,0000,0000,0000,,back side of the plugs or the prongs I should say.
Dialogue: 0,0:05:25.07,0:05:27.57,Default,,0000,0000,0000,,And those are just brass pieces with wires that
Dialogue: 0,0:05:27.57,0:05:30.18,Default,,0000,0000,0000,,go to the circuit soldered on.
Dialogue: 0,0:05:30.18,0:05:33.66,Default,,0000,0000,0000,,And then this part of the switch housing
Dialogue: 0,0:05:33.66,0:05:36.90,Default,,0000,0000,0000,,or I should say the plug is also made out of injection
Dialogue: 0,0:05:36.90,0:05:40.16,Default,,0000,0000,0000,,moulded plastic. And then we have the wire that
Dialogue: 0,0:05:40.16,0:05:42.57,Default,,0000,0000,0000,,comes down here and there's this protective rubber
Dialogue: 0,0:05:42.57,0:05:45.09,Default,,0000,0000,0000,,piece on the wire so that the wire can flex back-and-
Dialogue: 0,0:05:45.09,0:05:47.80,Default,,0000,0000,0000,,forth inside of the housing without wearing out.
Dialogue: 0,0:05:47.80,0:05:50.33,Default,,0000,0000,0000,,And if you look right here here's a warning. It says:
Dialogue: 0,0:05:50.33,0:05:53.42,Default,,0000,0000,0000,,unplug it do not remove this tag.
Dialogue: 0,0:05:53.42,0:05:55.96,Default,,0000,0000,0000,,They still want to warn you that it's definitely not safe
Dialogue: 0,0:05:55.96,0:05:58.97,Default,,0000,0000,0000,,to drop a hair dryer into water.
Dialogue: 0,0:05:58.97,0:06:01.86,Default,,0000,0000,0000,,This is a safety precaution but it's not a good idea
Dialogue: 0,0:06:01.86,0:06:04.76,Default,,0000,0000,0000,,to ever put the hair dryer near water because
Dialogue: 0,0:06:04.76,0:06:07.10,Default,,0000,0000,0000,,it is an electrical device with open contacts
Dialogue: 0,0:06:07.10,0:06:07.96,Default,,0000,0000,0000,,on the inside.