Waching daily Apr 27 2017

Hello and welcome.

Today's video is going to be a little bit different because I'm going to do the entire video in English.

Okay.

So if you want to watch this video with subtitles

Make sure to turn on your subtitles in your YouTube configurations.

Alright.

So last week I posted 10 sentences with some information about me.

Nine of these sentences were true and one was a lie.

So today I'm going to tell the story behind these 10 sentences.

So, the first sentence that I posted was

And this story is true! Can you believe it?

When I came to Brazil, for the second time, I went to the Federal Police to ask for an extension

on my tourist visa

But, I got there one day late.

And they stamped my passport that I was illegal and I needed to leave immediately

Well, I had already bought my plane ticket back

So I decided, ya know, I'm gonna stay.

And when I went to the airport to actually leave, about 3 months later

When I went to check in, the woman looked at my passport full of stamps

saying that I was illegal and needed to leave

and she sent me upstairs to the Federal Police where they did a spontaneous deportation

And then I had a police escort to the airplane

I knew that I had done something wrong.

I knew I overstayed the allotted time

So, I was never upset about being deported.

It was a very fair thing that happened to me.

So, yes. I was deported from Brazil while 8 months pregnant.

This is also true.

I did an exchange program in Spain while I was in college.

And a very, very good friend of mine and I decided to get a little tattoo as a souvenir, a permanent souvenir

of our time in Spain.

So, it's just a little symbol of Sevilla, the city that I lived in.

This one is false.

I never lived in the same building as Michael Jordan.

I did, however, see his kids at the swimming pool.

And I did live in a building with a lot of baseball players.

The building that I lived in was very close to Wrigley Field, where the Chicago Cubs play.

So there were a lot of baseball players living in my building.

This is true.

Not exactly cheerleaders, we called it the Pom Pom squad, but for those of you in Brazil, it's pretty much the same thing.

It's like a dance team with these pom pons.

But I know the idea of being a cheerleader and playing football and things like that is something very American.

So, I thought it would be something funny for you guys.

This is also true.

I am a naturalized citizen of Switzerland.

My mother's family is Swiss

I have a Swiss passport

So if I ever want to go to Switzerland, I guess I can.

Okay.

I think this is true.

But maybe it's something that I think I know how to do, but I really don't.

I will let you guys judge.

But be honest with me.

This is also true.

I think I was like 15 or 16

Maybe even a little bit younger

But there was one day and we were looking for some funny things to do

and I decided to ride the horse through the McDonald's drive-thru

But they wouldn't serve me. Can you believe it?

So, again this is also true.

So, my father...he had a farm with lots of exotic animals.

Buffalo, elk, rheas, emus,

different kids of parrots, fish, lizards, horses, cows, goats,

snakes, mice, chickens... I don't even know.

It was really, really fun...a great, great childhood

This is also true. We are...

There are some really cool things coming your way. So stay tuned.

That is it, you guys!

I hope you liked this video of telling some funny stories.

And remember, if you have any questions, you can always Ask Jackie

Bye-bye!

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O que é um diodo? - Duration: 6:20.

Hello guys! Welcome to Mundo da Elétrica!

In today's video I will explain to you what is a diode!

Let's get started!

I'm sure you've already seen a diode!

If you are watchin this video on a LED monitor or in a mobile phone with OLED screen, you

You are literally looking to millions of diodes!

Each little light that illuminates the electronics that you have in your home is a light emitting diode ...

better known as an LED!

A diode is an electronic component that allows the passage of electric current only

in one direction.

A simple analogy is to compare a diode to a valve that only allows water to flow

in one direction.

The diode does the same with the electric current.

A diode is a component with two terminals and its own schematic symbol indicates

its polarity.

If you look at the diode symbol you can see a small arrow. That arrow indicates

the direction to where electricity can flow!

The current flows from anode to cathode.

This little white line at the cathode of the diode It is also represented by the vertical line

that appears in the diode symbol, which helps memorizing polarity.

A diode has several applications.

One is to act as a rectifier, converting AC to DC voltage.

But a diode is not a perfec electric valve!

It spends some energy to work.

When current flows through a diode, some energy is lost as

heat.

This is realized through a voltage drop of approximately 0.7V.

The higher the current, the more the diode heats up.

And the voltage drop can also vary according to the current, the temperature and

also with the type of diode!

But let us consider the voltage drop of 0.7V for the rest of this video.

In other words, to make a diode conduct electricity you need to put at least

0.7V from anode to cathode.

With less than that, the silicon diode will not conduct electricity.

So if you put 5V between anode and cathode of a diode, there will be current flowing

through the diode and the voltage on the diode will be 0.7V, left 4.3V for the rest of the circuit!

This 0.7V voltage drop can be a issue in some circuits, which is why

there are diodes with different characteristics, including a much lower voltage drop.

Well ... and what else is important to know when choosing a diode?

As I said the diode dissipates a little heat ... so know the maximum power

it supports is important.

The power over the diode is calculated by multiplying the voltage drop by the current flowing

through the diode.

Suppose a 500mA current is passing for a silicon diode.

The usual voltage drop is 0.7V, so the power loss will be

of 0.5A * 0.7V = 0.35W.

Or 350 mW.

It may not seem like much, but it's a power that will make the diode heat a little and

can be significant depending on the circuit.

Therefore it is important to know the maximum current a diode can support and that you find

on its manual or datasheet.

And you can not connect two diodes in parallel to support more current.

If you do that, one of them will be faster to drain energy

and will end up heating more than the other.

The current will not be divided proportionally between the diodes as with resistors.

And this reminds me of another diodes very important feature: switching speed!

Each diode takes some time to close and open the ""valve"" which allows current

to flow.

There are diodes to be used in low frequency as those used in bridge

rectifies on AC line.

These easily support the 50 Hz or 60 Hz from AC line.

There are fastest diodes for other applications that support

much higher frequencies.

Another important feature of the diodes is the maximum reverse voltage or, in other words,

what is the maximum voltage at which the diode can prevent the passage of electric current.

Also in analogy with the water valve, as would be the maximum pressure that the valve

can withstand to without letting water leak!

The best way to learn about diodes is search for datasheets of various models

and see which of them can be used in each application.

and there are dozens of types and ratings o fdiodes.

In addition to the general purpose diodes, the most common are LEDs, the Zener diodes, the signal diodes

the power diodes, photo diodes, the laser diode, varicap diode, rectifier diode ...

The list is huge!

Now I will give a simple example of using a diode.

By connecting an AC voltage on a diode, the positive cycle of the wave will pass

though the diode and the negative cycle will be blocked.

This connection is the basic principle of voltage rectifiers!

I spoke specifically about voltage rectifier in another video.

See it here in the card that appears to you!

Ahh!

And if you want to fix any electronic device it is important to know how to test a diode!

A multimeter can be used to test a diode!

You put the multimeter the continuity scale or selects the diode symbol that some

multimeters have.

Now put the positive terminal of the diode on the positive terminal and the negative of the diode

in the negative of the multimeter.

By doing this you should hear a beep indicating that the diode is conducting in this direction.

Reverse polarity now and the beep must stop.

This means that the diode is conducting in one direction and is not conducting,

on another. Exactly as it should be!

If the diode conduct in both directions or do not conduct in any of them, means that it

is defective!

Well ... that's it folks!

I hope you enjoyed this video!

Give it a like, ok?

If you have any questions let it in the comments section below! Subscribe to

the channel to be notified of new videos!

Also visit the site MundoDaEletrica.com.br and sign up for our VIP mailing list!

Follow us on social networks and send your question!

That's it folks and I see you on the next video!