diode basics
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Posted by on January 17, 2007, 6:51 pm
Please log in for more thread options A diode allows current to flow from the anode to the cathode (but not vice-versa), correct? This picture is correct, right? http://en.wikipedia.org/wiki/Image:Diode_symbol.svg Thanks, Michael | ||||||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by John Popelish on January 17, 2007, 7:56 pm
Please log in for more thread options When the anode is more positive than the cathode, (by some small amount that varies with diode material) current passes through the diode, and it is said to be forward biased. The end of the symbol that looks like a triangle is the anode, and the end with the bar is the cathode. Most small cylindrical diodes have a band around the cathode end. Larger diodes often have a diode symbol painted on to show the polarity. | ||||||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Cimarron on January 17, 2007, 9:18 pm
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That is correct provided the voltage is not beyond the breakdown voltage in which case it will flow as well in the opposite direction. Cimarron >A diode allows current to flow from the anode to the cathode (but not
> vice-versa), correct? > > This picture is correct, right? > http://en.wikipedia.org/wiki/Image:Diode_symbol.svg > > Thanks, > > Michael > | ||||||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Cimarron on January 17, 2007, 9:48 pm
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That is correct provided the voltage is not beyond the breakdown voltage in which case it will flow as well in the opposite direction. >A diode allows current to flow from the anode to the cathode (but not
> vice-versa), correct? > > This picture is correct, right? > http://en.wikipedia.org/wiki/Image:Diode_symbol.svg > > Thanks, > > Michael > | ||||||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by terry on January 18, 2007, 4:03 am
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Cimarron wrote: > That is correct provided the voltage is not beyond the breakdown voltage in
> which case it will flow as well in the opposite direction. > > > >A diode allows current to flow from the anode to the cathode (but not
Correct:
> > vice-versa), correct? > > > > This picture is correct, right? > > http://en.wikipedia.org/wiki/Image:Diode_symbol.svg > > > > Thanks, > > > > Michael > > But now someone will come along and argue that since electrons are deemed to pass from cathode (-ve) to anode (+ve) it should be the other way round!!!!!!!! Ignore that; conventionally 'current' flows from anode to cathode. i.e. from positive to negative. Circuit analysis works fine that way. It IS the convention and since we can't see electrons any way it isn't important! For most practical purposes a diode can be considered a one way current flow device. There are many different types, ranging fro those so small they are part of a computer chip to huge electron tubes that glow. | ||||||||||||||||||||||||||||||||||||||||||||||||||||
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> vice-versa), correct?
>
> This picture is correct, right?
> http://en.wikipedia.org/wiki/Image:Diode_symbol.svg