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Now let's talk about the active devices active devices are devices or components which requires external

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source to their operation.

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The first one in our list is the diode adulthood is a two terminal P conjunction device that allows

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the flow of current.

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Only in one direction it may comes in many shapes.

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As you can see this is the ocean and ship it has a gray line here indicating that this is the negative

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terminal.

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And this is the positive terminal.

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The positive terminal is called a..

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As in this schematic and the negative terminal is called cathode.

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This is called identifier diode.

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This diode rectify our circuits or form our supply units.

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The second chair of this diode is this physical shape.

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It's called Xena diode and it has the very same symbol but with two as you can see dashes.

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This is the anode and this is the cathode.

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And its function is voltage regulator and power supply units the third most common one is valid or light

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emitting diode.

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This is the symbol for valid.

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It's the same as this symbol but has two arrows going out of this diode which means that this will emit

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light and light will get out of this diode once current passes through its calculators the Sibley TV

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mobile phone displays and any indicator circuit uses led to indicate a specific state just like turn

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on and turn off.

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So these are the three shapes and they are very common components in any electronic circuit.

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So each circuit has at least one diode and one led next.

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We are going to have our transistors and it's also a very common component in electronic circuits.

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Thanks for watching.

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Keep in mind that these are the three physical shapes for rectify our diode Zena diode and LEDs which

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are basically three different shapes of diode.