Now let's talk about the active devices active devices are devices or components which requires external
source to their operation.
The first one in our list is the diode adulthood is a two terminal P conjunction device that allows
the flow of current.
Only in one direction it may comes in many shapes.
As you can see this is the ocean and ship it has a gray line here indicating that this is the negative
terminal.
And this is the positive terminal.
The positive terminal is called a..
As in this schematic and the negative terminal is called cathode.
This is called identifier diode.
This diode rectify our circuits or form our supply units.
The second chair of this diode is this physical shape.
It's called Xena diode and it has the very same symbol but with two as you can see dashes.
This is the anode and this is the cathode.
And its function is voltage regulator and power supply units the third most common one is valid or light
emitting diode.
This is the symbol for valid.
It's the same as this symbol but has two arrows going out of this diode which means that this will emit
light and light will get out of this diode once current passes through its calculators the Sibley TV
mobile phone displays and any indicator circuit uses led to indicate a specific state just like turn
on and turn off.
So these are the three shapes and they are very common components in any electronic circuit.
So each circuit has at least one diode and one led next.
We are going to have our transistors and it's also a very common component in electronic circuits.
Thanks for watching.
Keep in mind that these are the three physical shapes for rectify our diode Zena diode and LEDs which
are basically three different shapes of diode.