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These are the user uploaded subtitles that are being translated: 1 00:00:01,137 --> 00:00:04,027 In order to get our computer to work, let's give it some power. 2 00:00:04,027 --> 00:00:07,735 Computers have a power supply that converts electricity from your wall to 3 00:00:07,735 --> 00:00:08,762 something usable. 4 00:00:08,762 --> 00:00:13,223 There are two types of electricity DC or direct current which flows in one 5 00:00:13,223 --> 00:00:18,660 direction and AC or alternating current which changes directions constantly. 6 00:00:18,660 --> 00:00:22,226 Our computers use DC voltage so we have to have a way to 7 00:00:22,226 --> 00:00:27,020 convert the AC voltage from our power company to something we can use. 8 00:00:27,020 --> 00:00:28,731 That's what our power supply does. 9 00:00:28,731 --> 00:00:33,165 It converts the A C we get from the wall into low voltage DC power that we can use 10 00:00:33,165 --> 00:00:35,539 and transmit throughout our computer. 11 00:00:35,539 --> 00:00:38,104 So let's talk about power supplies, I actually have one right here. 12 00:00:38,104 --> 00:00:42,760 Lemme show you how one looks like, take it out right here. 13 00:00:42,760 --> 00:00:47,542 So, most power supply units have a fan which is right in here, they also have 14 00:00:47,542 --> 00:00:52,200 voltage information which is normally listed underneath or on the side. 15 00:00:52,200 --> 00:00:57,936 And cables like this one to power 16 00:00:57,936 --> 00:01:04,529 your motherboard and a power cable. 17 00:01:04,529 --> 00:01:07,199 Have you ever plugged one of your devices into the wall outlet and 18 00:01:07,199 --> 00:01:08,046 fried your device? 19 00:01:08,046 --> 00:01:11,468 If you haven't, you're really lucky, after completing this lesson, 20 00:01:11,468 --> 00:01:13,965 hopefully you'll know how to avoid that situation. 21 00:01:13,965 --> 00:01:18,270 To understand electricity, let's use the example of water pipes. 22 00:01:18,270 --> 00:01:21,870 Our tanks have a faucet that's connected to a pressurized water tank. 23 00:01:21,870 --> 00:01:24,530 When we turn on the faucet, water comes out. 24 00:01:24,530 --> 00:01:28,510 This is sort of how electricity works, when we plug in appliance into a wall 25 00:01:28,510 --> 00:01:31,730 outlet and turn it on, a flow electricity comes out. 26 00:01:31,730 --> 00:01:36,320 If we added more pressure to our water tank, would more water come out of it? 27 00:01:36,320 --> 00:01:39,623 The higher the pressure, the more water there will be. 28 00:01:39,623 --> 00:01:43,680 When it comes to electricity, we refer to the pressure as voltage. 29 00:01:43,680 --> 00:01:48,724 So, when I was on vacation to my surprise, when I plugged in the 120 volt appliance 30 00:01:48,724 --> 00:01:54,160 into a 220 volt outlet, the power came bursting through and fried my charger. 31 00:01:54,160 --> 00:01:58,333 If it was the other way around and a 220 volt appliance was plugged into 120 32 00:01:58,333 --> 00:02:01,900 volt outlet, I wouldn't have seen the same outcome. 33 00:02:01,900 --> 00:02:04,932 I'll still be able to get electricity, but slowly. 34 00:02:04,932 --> 00:02:09,477 This would be similar to if a water tank was only half pressurized it will draw 35 00:02:09,477 --> 00:02:12,459 water but slowly, in some cases though, this can 36 00:02:12,459 --> 00:02:17,234 deteriorate the performance of the device and cause damage in the long-term. 37 00:02:17,234 --> 00:02:21,189 As a general rule, be sure to use the proper voltage for your electronics. 38 00:02:21,189 --> 00:02:24,919 We refer to the amount of electricity coming out as current or 39 00:02:24,919 --> 00:02:27,430 amperage and it's measured in amps. 40 00:02:27,430 --> 00:02:31,095 We can think of amps as pulling electricity as opposed to voltage, 41 00:02:31,095 --> 00:02:32,770 which pushes electricity. 42 00:02:32,770 --> 00:02:38,482 Amps will pull as much electricity needed, but voltage will just give you everything. 43 00:02:38,482 --> 00:02:40,600 Look on the back of one of your device charges. 44 00:02:40,600 --> 00:02:43,671 You might see something like1 or 2.1 A, 45 00:02:43,671 --> 00:02:48,651 charging a device with 2.1 amps will actually charge a device faster 46 00:02:48,651 --> 00:02:54,050 because it's able to put more current from a 2.1 amp than a 1 amp charger. 47 00:02:54,050 --> 00:02:58,056 Finally, the other important part of the electricity that you'll need to know is 48 00:02:58,056 --> 00:02:58,762 the wattage. 49 00:02:58,762 --> 00:03:02,940 Wattage is the amount of volts and amps that the device needs. 50 00:03:02,940 --> 00:03:05,942 If your power supply has too low the wattage, 51 00:03:05,942 --> 00:03:10,770 you won't be able to power your computer, so make sure you have enough. 52 00:03:10,770 --> 00:03:14,115 This doesn't mean that if you have a large power supply you will overpower your 53 00:03:14,115 --> 00:03:14,628 computer. 54 00:03:14,628 --> 00:03:18,403 Power supplies just give you the amount that your system needs. 55 00:03:18,403 --> 00:03:21,293 It's best to err on the side of large power supplies, 56 00:03:21,293 --> 00:03:24,907 you can power most basic desktops with a 500 watt power supply. 57 00:03:24,907 --> 00:03:28,396 But if you're doing something more demanding on your computer like playing 58 00:03:28,396 --> 00:03:31,990 a high resolution video game or doing a lot of video production and rendering, 59 00:03:31,990 --> 00:03:34,960 you will likely need a bigger power supply for your computer. 60 00:03:34,960 --> 00:03:37,985 On the other hand, if all you're doing is just browsing the web, 61 00:03:37,985 --> 00:03:41,030 the power supply that comes with your computer should be fine. 62 00:03:41,030 --> 00:03:44,480 All kinds of issues are caused by a bad power supply. 63 00:03:44,480 --> 00:03:48,792 Sometimes the computer doesn't even turn on at all, since power supplies can 64 00:03:48,792 --> 00:03:53,316 fail for lots of reasons like burnouts, power surges or even lightning strikes. 65 00:03:53,316 --> 00:03:57,130 Knowing how to diagnose power issues and replace a failed power supply 66 00:03:57,130 --> 00:04:00,890 is a skill every IT support specialist should have in their toolbox. 6580

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