scott wrote:
>> Is that why LEDs display a non-linear brightness response too?
> 
> Non-linear with respect to what?  The brightness response is pretty 
> linear with respect to current, double the current you get double the 
> brightness to within a few %.

Well, I had a diagram for a circuit where you connect a lamp to the 
battery through a linear potentiometer. The brightness of the lamp 
varies roughly linearly. But the brightness of an LED... does not.

(I'm showing my age now! Can you imagine trying to buy a 3V lamp today??)

>> I presume you mean you can "ignore" them for the purposes of figuring 
>> out the total current flowing through the system. Clearly the current 
>> flowing through each path only depends on the resistence of that path 
>> and the potential difference...
> 
> I meant if you have a point of unknown voltage connected to two (or 
> more) other known voltages via resistors.  If one of the resistors is 
> drastically lower than all the others, then you can just assume the 
> unknown point is directly connected through the lowest resistance and 
> treat all the other resistors as essentially not connected.

Right. Gotchya.

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