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In order to get our computer to work,
let's give it some power.
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Computers have a power supply that
converts electricity from your wall to
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something usable.
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There are two types of electricity DC or
direct current which flows in one
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direction and AC or alternating current
which changes directions constantly.
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Our computers use DC voltage so
we have to have a way to
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convert the AC voltage from our power
company to something we can use.
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That's what our power supply does.
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It converts the A C we get from the wall
into low voltage DC power that we can use
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and transmit throughout our computer.
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So let's talk about power supplies,
I actually have one right here.
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Lemme show you how one looks like,
take it out right here.
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So, most power supply units have a fan
which is right in here, they also have
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voltage information which is normally
listed underneath or on the side.
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And cables like this one to power
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your motherboard and a power cable.
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Have you ever plugged one of your
devices into the wall outlet and
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fried your device?
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If you haven't, you're really lucky,
after completing this lesson,
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hopefully you'll know how
to avoid that situation.
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To understand electricity,
let's use the example of water pipes.
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Our tanks have a faucet that's
connected to a pressurized water tank.
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When we turn on the faucet,
water comes out.
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This is sort of how electricity works,
when we plug in appliance into a wall
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outlet and turn it on,
a flow electricity comes out.
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If we added more pressure to our water
tank, would more water come out of it?
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The higher the pressure,
the more water there will be.
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When it comes to electricity,
we refer to the pressure as voltage.
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So, when I was on vacation to my surprise,
when I plugged in the 120 volt appliance
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into a 220 volt outlet, the power came
bursting through and fried my charger.
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If it was the other way around and
a 220 volt appliance was plugged into 120
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volt outlet,
I wouldn't have seen the same outcome.
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I'll still be able to get electricity,
but slowly.
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This would be similar to if a water tank
was only half pressurized it will draw
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water but slowly,
in some cases though, this can
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deteriorate the performance of the device
and cause damage in the long-term.
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As a general rule, be sure to use
the proper voltage for your electronics.
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We refer to the amount of
electricity coming out as current or
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amperage and it's measured in amps.
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We can think of amps as pulling
electricity as opposed to voltage,
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which pushes electricity.
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Amps will pull as much electricity needed,
but voltage will just give you everything.
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Look on the back of one
of your device charges.
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You might see something like1 or 2.1 A,
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charging a device with 2.1 amps will
actually charge a device faster
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because it's able to put more current
from a 2.1 amp than a 1 amp charger.
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Finally, the other important part of the
electricity that you'll need to know is
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the wattage.
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Wattage is the amount of volts and
amps that the device needs.
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If your power supply has
too low the wattage,
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you won't be able to power your computer,
so make sure you have enough.
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This doesn't mean that if you have a large
power supply you will overpower your
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computer.
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Power supplies just give you
the amount that your system needs.
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It's best to err on the side
of large power supplies,
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you can power most basic desktops
with a 500 watt power supply.
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But if you're doing something more
demanding on your computer like playing
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a high resolution video game or doing
a lot of video production and rendering,
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you will likely need a bigger
power supply for your computer.
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On the other hand, if all you're
doing is just browsing the web,
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the power supply that comes with
your computer should be fine.
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All kinds of issues are caused
by a bad power supply.
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Sometimes the computer doesn't even
turn on at all, since power supplies can
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fail for lots of reasons like burnouts,
power surges or even lightning strikes.
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Knowing how to diagnose power issues and
replace a failed power supply
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is a skill every IT support specialist
should have in their toolbox.
6580
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