XPost: uk.rec.driving   
   From: a@b.com   
      
   "bm"  wrote in message   
   news:51786764$0$3690$c3e8da3$40cb80c2@news.astraweb.com...   
   >   
   > "Dave Plowman"  wrote in message   
   > news:53419fdcd1dave@davenoise.co.uk...   
   >> In article <51783438$0$49048$c3e8da3$40cb80c2@news.astraweb.com>,   
   >>   bm  wrote:   
   >>> > Take for example a 6 volt DC supply connected to an LED in series with   
   >>> > a 200 ohm resistor. 2V 20mA at the LED, 4V 20mA in the resistor.   
   >>> >   
   >>> > Now change the supply to 4V.   
   >>> > 2V 10mA at the LED, 2V 10mA in the resistor.   
   >>   
   >>> Fuck a duck, they DID teach you something.   
   >>   
   >> That makes two of you who failed GCE electronics.   
   >   
   > Sorry, Dave, but I think you'll find that his 'sums' are pretty much   
   > correct, amazingly.   
      
   Treat the LED as a 2V Zener and you won't go far wrong.   
      
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