### CompTIA A+ 220-1001

Course
Time
8 hours 39 minutes
Difficulty
Beginner
CEU/CPE
9

### Video Transcription

00:00
This is lesson eight dot horn power supply types and features a summary of power supplies
00:05
and options. Okay, this list that we're gonna talk about computer power supplies and how they fit into the range of computers and systems that we've been talking about here on the 2 to 0 dash ones. Those are one come ta plus. So this is our less objectives. Ah, Power overview, GED. An overview of power and background information. There.
00:25
They were gonna move and talk about the 115 vote versus the torture and 20 vote M
00:31
input 24 24 p. M. Motherboard adapter and outputs. The three vote, five vote and 12 vote and the number of devices in the type of devices that could be powered from your power supply. And we're gonna finish talking about power supply wattage ratings. So let's go and jump variety in.
00:48
So let's talk about a power overview. Now. The power supply in your computer is the most important component in your computer. Before we jump into that, let's talk about power and give you a little background information, and then we'll talk about the placement of the power supply, how it comes into the grand scheme of things as far as one is dealing with the power.
01:08
Now, the power that is supplied to your home or business is a sea alternating current in the voltage of either 1 22 20 votes.
01:17
Your computer operates on D. C. Direct current power, so the power supply in your computer converts. This acts like a converter of sorts and converts this vote to tow a usable power of D. C and powers, your computer and its components. With this DC power.
01:33
Now, electricity is a flow of negatively charged particles called electrons through matter. And you may remember that from old high school um, learning and so forth,
01:45
electricity works the same as water flowing through pipes. It's under pressure and from your supplier delivered to you.
01:52
This pressure is called voted and is measured in votes. The amount of electrons or electricity moving past. A certain point is known as the current or the amperage. This is measured in amps or you'll see uppercase letter A
02:07
okay. Also continuing on resistance to electrons, electrons is president, all type of wires or medal for that effect. This resistance is measured in was called homes and you fray heart of homes before
02:22
now, the amps or votes needed for a device to function properly is on the wattage it needs so
02:30
and again somewhere you may be familiar with this calculation. V times a equals W, which is votes times amps equals watts on and that's how that's derived.
02:42
S o key points to remember Pressure is votes volume, volume flowing. It's AM Parise. Work is wattage on the work that that source does all that power does. That's the wattage. And the resistance found in all cables is alms.
02:59
You're gonna need those key things. As you started working with power supplies. When you're looking on the backs of the power supply boxes
03:05
and you're going to see Holmes, you're gonna see wattage is and how to give you a little background information as far as what you're looking at and how to determine what you need and how to make a better judgment as faras, which components you're going to be needed for a system whether you may be building, repairing or so forth.
03:22
Now electricity's in one of two forms D. C or a C. D. C, which we spoke about earlier is D. C is the recurrent. It's when the flow of electrons moving continues flow in one direction. Most electronic devices are powered with D C. Current mobile phones, mobile devices.
03:40
All of those are power with DC Current
03:45
A. C or alternating current is when the flow alternates back and forth in a circuit. Now this is with supply to you the A C current, and because it flows back and forth, it can travel longer. Distances hits while the power company supplies you power from a long distance away through power lines to your home or business.
04:04
So again,
04:05
a sea power comes from the power company travels long distances to your business or your home and D. C is for mobile devices. And when we spoke about earlier that power supply in your computer takes that A C converts it to D. C for it's usable components and parts. Okay,
04:24
so again, now, the power supplies main job is converting that incoming A C and output it to D. C. So forth system and its components to use the devices on that system,
04:34
04:43
negative 3.3 votes. D C. 5.5 votes. D. C. And 12 0 D. C. Power supplies are available with a dual voted switch option. Some power supplies are auto switching,
04:57
So in the back of your computer, there's a power still apply, which we've all seen before. That's where the main power core plugs into right there by the fan. And there's a little red switch that little rests which, if you've ever wondered what that waas that is your duel vote to switch option. So you and here in the US, we would use for 1 15
05:16
if you were somewhere in a part of the country or another country to supply 220 you would switch that, too,
05:23
for the 220.
05:25
Now you want to make sure that your system is power off and sometimes unplug before you make that switch. You don't want to switch it while with the current is running live. That could damage your your system. So that's what the dual voted switch is right there in the back of the computer.
05:44
Okay, so from the power supply you pricing a, um, act octopus of wires of sorts.
05:50
The main wire coming out of that power supply is your 24 pin Mother Ward adapter power. The main motherboard power connector is a 24 pin connector. It's commonly providing plus three votes minus five votes and plus and minus 12 votes for the motherboard. And the motherboard. Components
06:11
06:15
and plus in minus 12 votes.
06:18
Now older motherboards had a connector with 20 pansy stuff. 24. The additional four pins were added a four total of 24 4 The PC I expressed bust. It needed more power, so four pins were added.
06:32
The 24 pin connect will work with 20 pen connectors with four peons left over. Some out models allow you to even remove those extra for peons. Since you're not needing him,
06:44
look closely at the 24 pin motherboard adapter, and this is a Iike, say, a guarantee safety feature, so you won't or anyone won't cause any damage. If you look at the connector itself, you'll see some of them are shape square. Some of them are rounded some of the ports rather.
07:00
And if you look on the connector on the motherboard to your right,
07:03
some are square and some around it. What this means is that connector can only fit one way, and because of that, there's no way of mixing it up in putting in upside down or different way. It orients Cory. It's one way and therefore connects one way, so those you will not
07:23
short your motherboard hour or cause any damages.
07:27
Now let's talk about the output. Three votes, five votes and 12 votes. Different voters is of powered different sized devices on the motherboard. Power supplies will provide both positive and negative voltage. Most modern motherboards no, do not use the negative voltage anymore. It was more the older ones. So
07:45
before we go any further, let's look at this image here. And this is the gigabyte power supply. And this is what you
07:50
see on the back of a power supply. All this information you'll see here that it shows that 3.3 votes plus five votes and it also showed you the average plus 3.3 votes at 30 amps, plus five votes at 28 amps plus 21 votes at 18 amps,
08:09
08:11
12 votes in the Senate, A. T. M s, and so four. And these are the different voters. Just that your power supply of provides the total wattage would be the max combined total wattage. So what that means is this is the total wattage wattage of the overall power supply.
08:28
550 watts. It's split up over those different rails there,
08:31
the three votes the five wounds two plus 12 and so forth. So that's what you'll see on the back of your power supply and on the power supply box. Now you would have uneducated understanding of what you're looking for and what this really means, and this kind of helps you decide and make decisions. If you're building a system from scratch,
08:50
how much power do you really need,
08:52
depending on the components of what you're trying to our power
08:58
now, plus 12 votes, This normally powers the PC I adapters, the cooling fans, the hard drive motors and other modern components. These air the heavy lifting. It doesn't all the heavy lifting components. The heavy devices like the cooling fans in the hard drive motors. That's what the plus 12 votes power
09:16
09:18
plus five votes on the modern motherboard is. Less frequent was more of the plus 3.3 votes. Older motherboards used the plus five votes more. But now our devices are getting more efficient. So they're running on plus 3.3 votes memory modules into slots and motherboard circuits run from the plus 3.3
09:39
nana 12 vote and negative five votes are not widely used anymore. On the newer motherboards, the negative 12 vote power, the older serial ports are integrated land ports, and some of the older PC I slots. So again, negative powder is not used that much nowadays.
09:56
Power supply ratings, all the devices, the components of a system requires a certain wattage to function. The total waters of our devices combined is the minimum power supply you should provide for the system. So what that means is okay, so if you add up all the devices like I said earlier, and you know you need a certain wattage,
10:16
that's the type of power supply you're gonna be looking for.
10:20
Also, keep this in mind as well, depending on the type of motherboard that you're gonna be using for your system again, if you're building a system, are replacing a system it to tell you, or they're different power supply ratings or the version that you can use for that motherboard.
10:35
So again, let's look at this particular power supply on the image on the left. This is 1000 app.
10:41
Power supply, 1000 lot. Rather power supply again has the different rails, the 12 votes of the three votes in the five votes and so forth, and this one to split up over two different rails. The 500 watt that supplies it on one side in the 505 100 watts. Pleasant on the other side
11:00
and on the right is just a blow up of that tag right there on the left. So you can
11:03
you can see as far as you different outputs versus the maximum combined wattage There.
11:11
Another rating that you will see eyes the 80 plus rating the 80 plus rating power supplies are graded for their efficiency under a voluntary standards called wth E 80 plus
11:24
under 80 plus power supplies a rating from 80% to 94% efficiency for a given load and given a badge with metal labels such as bronze, 85% gold, 90% titanium, 94% levels. The better the efficiency,
11:41
the less power this supply, the less power this supply waste.
11:45
So if you had, like our previous slide, 1000 what power supply and you had an 80 plus Titania rating, that means you're getting that full 1000. Watts would hardly any loss. It's, um,
12:01
94% efficient as far as the power it supplying. It's not wasting any power.
12:07
So that's what these powers of rating R four
12:11
now, when a power supplies selected, it should cover the system requirements to power all the devices with the little room to grow. You may even want to use a 50% rule. If your devices add up to say, for instance, 424 150 watts,
12:28
you may want to increase that by 50% 4 room to grow if you know you're gonna be adding more devices
12:35
to that system
12:35
as a general recommendation for a new system, use at least a 500 watt power supply.
12:43
One thing to note that on some of the information that we went over the company. Eight plus ones. Those are one exam Does not require calculations to figure precise wattage needs for a particular system. Just know this information that we went over.
12:58
Okay, So power supplies we talked about power in generate an overview of power. We talked about the 1 15 votes buses. The 220 voting puts the motherboard adapter, the 24 p. M versus the 20 pan and the outputs that's used nowadays, the 33 votes, five votes and 12 votes.
13:18
And the number of the device is in the type of devices to be powered. And we finished off. What? Power supply ratings. Okay,
13:24
that is our lesson for today. We will see you in the next lesson.

### CompTIA A+ 220-1001

This course covers the CompTIA A+ 220-1001 exam components needed to pass both exams to earn the CompTIA A+ certification. This course will cover both exams with part 1 covering the 1001 exam. The course will also include labs and quizzes to help reinforce learning.

Bill Price
Instructor