zepp
  • zepp
AAAAHHH DIODES
Physics
schrodinger
  • schrodinger
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zepp
  • zepp
|dw:1343334529272:dw|
zepp
  • zepp
If the diode is in the right direction, then the current will flow through it, if not, it won't, correct?
anonymous
  • anonymous
I'm thinking...burnt orange...

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zepp
  • zepp
|dw:1343337870176:dw|
zepp
  • zepp
And normally, a diode works this way, but in the drawing above, the current would technically not flow in the diode.. |dw:1343337901676:dw|
zepp
  • zepp
anonymous
  • anonymous
Keep in mind that "conventional current" is reverse to what the electrons actually do. :-)
anonymous
  • anonymous
Diodes are like one-way valves in a water pipeline system. They put up extreme resistance if you go the wrong way.
anonymous
  • anonymous
Question for you @zepp, do you know which charges the anode and cathode has, respectively?
anonymous
  • anonymous
|dw:1343338737231:dw|
anonymous
  • anonymous
"conventional current" = the direction of positive charge flowing around a circuit
anonymous
  • anonymous
Still confused @zepp ? Look at page 3 of this document ;-) http://ww1.microchip.com/downloads/en/appnotes/00905a.pdf
zepp
  • zepp
|dw:1343339611472:dw| So the 'real current' flows like this?
zepp
  • zepp
|dw:1343339743335:dw|
Shane_B
  • Shane_B
Was there a question in all of this ? I'm confused :P
zepp
  • zepp
But how do you explain this? D:
zepp
  • zepp
@Shane_B I'm confused about the direction of the current flowing through the diode
Shane_B
  • Shane_B
You have an LED with a current limiting resistor and it's forward-biased, so it should light up when the NPN transistor is on :)
Shane_B
  • Shane_B
As long as the anode is about 0.6V-0.7V more positive than the cathode, current will flow through it from anode to cathode. Is that what you're asking?
zepp
  • zepp
Well the two diodes are in different direction and current still flows in both, that's what I'm not getting :(
Shane_B
  • Shane_B
Current won't flow through the one on the left...since the cathode is more positive than the anode.
zepp
  • zepp
Here's the circuit: http://www.oomlout.com/oom.php/products/ardx/circ-03
zepp
  • zepp
If the current doesn't flow through it, why did they put it there?
Shane_B
  • Shane_B
The diode on the left is a protection/blow-out/flyback diode to protect the motor...it's not meant to have current running through it
Shane_B
  • Shane_B
http://en.wikipedia.org/wiki/Flyback_diode
Shane_B
  • Shane_B
It's pretty common to see that diode configuration in solenoids and small motors....they prevent voltage spikes (from the collapsing field of the inductor) from damaging the motor.
Shane_B
  • Shane_B
I probably didn't word that very well but in essence it's a protection device for the motor.
zepp
  • zepp
I see, I thought that diode was use to block current or something, thanks!
Shane_B
  • Shane_B
I haven't studied diodes in many years so I'm a little weak on the full theory behind it...but it's there to prevent voltage spikes from damaging the load when the field of the inductor collapses. In normal operation, there should be 0 current going through it.
zepp
  • zepp
Alright, I think I got the concept, thanks again!
Shane_B