What Is a Diode?
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- Опубликовано: 8 фев 2025
- This electronics video tutorial provides a basic introduction into diodes. It explains how a diode works and how to perform calculations when it's in series with a resistor.
What Is a Diode? • What Is a Diode?
How To Solve Diode Circuit Problems:
• How To Solve Diode Cir...
Diode Logic Gates - OR, NOR, AND, & NAND:
• Diode Logic Gates - OR...
Clipper Circuits:
• Clipper Circuits
Clamper Circuits:
• Clamper Circuits
Half-Wave Rectifiers:
• Half Wave Rectifiers
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Full-Wave Rectifiers:
• Full Wave Rectifiers
Full-Wave Bridge Rectifiers:
• Full Wave Bridge Recti...
220V AC to 12V DC Converter:
• 220V AC to 12V DC Conv...
Capacitor Voltage Booster Circuit:
• Capacitor Voltage Boos...
Half Wave Voltage Doubler Circuit:
• Voltage Multipliers - ...
Full Wave Voltage Doubler Circuit:
• Full Wave Voltage Doub...
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Voltage Multiplier Circuit:
• Voltage Multiplier Cir...
Light Emitting Diodes:
• LEDs - Light Emitting ...
Power Dissipation In LEDs & Diodes:
• Power Dissipation In R...
Final Exams and Video Playlists:
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Full-Length Videos and Worksheets:
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1N4007 Diodes:
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I remember which end is the anode because the arrowhead in the symbol for a diode looks like an "A" (for Anode) on its side. It points in the direction of "conventional" positive-to-negative (P-to-N) current flow, which reminds me that the anode has P-type semiconductor, and the cathode has N-type semiconductor. The vertical line for the cathode represents a wall that blocks "conventional" current from going from cathode to anode. That "wall" is represented by a ring marked around the cathode end of a "physical" diode.
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Researchers who study the psychology of learning have found that the order in which you learn something is not important. That is good because we rarely have the time or opportunity to start something "from the beginning," which is different for different people because of their different backgrounds. It is fine to "fill in" your understanding as needed. I can't say much more because RUclips does not allow posts that provide or even suggest links elsewhere.
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a diode is a semiconducting device that allows current to flow in one direction, so this is the electrical symbol of a diode.
Conventional current will flow in the direction of the arrow. It wont flow in the opposite direction of the arrow, the only way you can make it flow in that direction is if you apply a very high voltage because any insulator can become a conductor if the volatge applied is very very high, there's always a breakdown voltage to an insulator but for practical purposes a diode conducts electricity in one direction. Now keep in mind this is opposite to the electron flow
(
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Electrons flow from negative to positive?
Yes. Electrons flow from negatively charged area to positively charged area. Therefore, current which is a flow of electron vacancy or hole, flows from positive to negative. If you add a battery to a circuit then current will flow from the positive terminal of the battery towards the negative terminal of the battery through all the other elements in the circuit.
To ease the confusion, think of heat flow according to thermodynamics. Heat flows from high temperature area to low temperature area. Also if you think of water, it flows towards the area where water is less or the pressure is less.
Just like that everything in nature flows from it's majority towards it's minority.
In a negatively charged area, electrons are higher in number. So electron flows from negative to positive.
Current flows in the opposite direction of electron flow. So, current flows from positive to negative.
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Welcome. Happy to help. :)
@@farjanasharminswarna2450 but current IS electron flow isn’t it? I’ve seen it explained that way in several videos
@@mrbushpilot current is electron flow, but it flows in direction opposite to electrons just like positive charges.
Negative charges flow from negative to positive(lower potential to higher) and positive charges flow vice versa.
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In 11:44, isn't that the diode is OFF because the forward voltage applied across its terminals does not exceed the diode's forward voltage threshold, which is according to the video is 0.7 volts? Please advise.
It is on because the source voltage is in negative value, flowing through the cathode (negative terminal) side of the diode. If the negative voltage source is flowing through the anode (positive terminal) then the current wont flow.
As far as I know, the operating points including the voltage level can change based on the resistance but you assumed that the voltage across the diode was 0.7V. Can you explain why?
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Thanks
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How do you get NEGATIVE VOLTAGE ? -7 V ? Do you hook up the negative battery terminal on top and the positive terminal on bottom ?
Tysm .. sir
So how would we use the diode?
At @6:20 he assumes the voltage across the diode is exactly 0.7V, but there is no reason to assume this! Surely, the diode can have a range of possible voltage values across it, as seen in the diode's Voltage, Current graph @3:30. This variable diode Voltage presumably increases as a result of increasing the source Voltage. In light of this point, how does one then properly calculate the resulting voltages, and current?
In my solar panel my schoty diodes are with the negative terminal of the diode toward the positive, but in your circuit are the opposite, i can't guess why, i will study this tonight?
Thanks a lot sir
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Hey, I think you made a mistake. Electric components in the electric circuits never consume power unless they have internal resistance. Since you provided that the diode has a voltage of .7 volts, this means it is ideal one so it has no resistance and, thus, consumes no power
Any electrical component with a positive voltage across it and a positive current flowing into the positive terminal consumes power. The idea of "resistance" is only a linear approximation to much more complex phenomena, such as what happens in a diode. The only power equation that always applies is P =V*I
If there is a voltage drop of .7 volts across the diode it must be consuming current when it's in the forward bias mode. Its simple ohm's law.
You cannot guarantee the voltage across the diode will always be 0.7 V can you? It depends on other resistors in the circuit
@@bestbronzena4918 no, it’s always .7 with a diode
@@user-wc6pp4mi6t i think its just for Silicon.
Germanium has like 1.4V
Tq😊
Conventional Current Flows from the Cathode to the Anode against the Arrow.
I dont unerstand why the naming is different compared to a battery. I thought the anode of a battery was the negatively charged terminal that has excess electrons, so why would the anode of a diode be the electron deficient part that contains holes, its just confusing. I was just reading somehting and had a thought: Is the anode of a battery actually initially positively charged, becoming negatively charged only when the chemical reaction happens within the battery and the resulting free electrons are attracted towards it?
to correct a wrong is more nobel than covering it up.
Helpful
I watched it
Hi. I have a doubt on a dicode question to ask Are you able to help
Is it optional that a diode would be on if the voltage flowing across the diode is exactly 0.7?
What would happen if the voltage is less or more than 0.7?
If the voltage supplied across the diode is less than the diode voltage, then the diode won't "Turn On". Otherwise, the the voltage supplied across the diode exceeds the diode voltage, then the diode will "Turn On".
Thanks🎉
Probably a dumb question but in the 3rd example of 0V (low) going to -7(high) the diode would have a voltage drop of 0.7 volts but you have 0V passing the diode so even if the circuit is on, no current would flow because you don't have the voltage strength to pass the diode. Can someone explain what I'm clearly missing? I'm probably just dumb. lol
The 0V in the 3rd example is the high potential and the -7V is the low potential, so the potential difference is 0-(-7) = 7V which is more than the voltage drop in the diode (0.7V), so current will flow in the direction shown in the video.
@@ahmedbelal7370 that makes sense thanks !
Does diode block the flow of electrons as it does to current in flowing in one direction, since electrons flow in opposition with current. I.e diode allow current flow in one direction, block it in opposite direction, while electrons flow in opposite direction, will the electron b blocked hence it's flowing in the direction diode is blocking. Reply pls.
Now i got they are reverse biased to impede current through poitive and negative and let i flows to the cables.
I'm gonna top the quiz
Hi,why the number of electrodes in avalanche diodes is 4?
That current placement is wrong there 07:17 that current is the current that passed the resistor not the initial current