Re: R = V/I with real lightbulbs

[Leigh Palmer <palmer@SFU.CA>]

>        I finally have time to put my foot into this mess.
> William Lichten in his book "Data and Error Analysis" gives as an example
> the current verses voltage relationship for a tungsten lamp from an applied
> voltage of 30 mV to 5.3 volts. The log-log graph starts out with a slope of
> about one (where Ohm's law is approximately correct) and then at higher
> voltages it shifts over to about a 5/3 power law relationship where
> radiation cooling becomes important. It is a nice example of how different
> relationships are at work depending on the physical conditions of the system.

In what way does radiation influence the I vs. V relationship? This
will surely confuse students, as it confuses me.

Leigh