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+.TL
+Notes from work experience day 2
+.AU
+Lucas Standen
+.AI
+30/5/24
+.NH 1
+The voltage over an LED
+.NH 2
+The experiment
+.LP
+Continuing on from yesterdays study of The wavelength of LEDs and how it change as the current was 
+increased, today I have taken results showing how time effects the voltage across the LED.
+
+I would predict that the LED's voltage will fall over time as the temperature increases, which will
+cause the die to "slow down" so to say, or stop behaving as once intended.
+
+My results were taken on a green LED with a 10mA current provided at 2.2V. A multimeter was used to
+capture data from the LED, it takes 2000 readings and outputs them in a csv file (my results can be 
+found in results.csv).
+
+I found it took on average 45 seconds for the multimeter to take 2000 results.
+The data was taken at 1 nplc (1 nplc = 1/50hz)
+
+.NH 2
+Results
+.LP
+As expected the voltage over the LED fell slightly over time, the graph of these results can be seen
+bellow.
+.PSPIC graph.ps
+.LP
+Another graph showing the first 450ms can be seen here, this relates to how our pulse mesurements
+from yesterday
+.PSPIC graph2.ps
+.LP
+As you can see, this is experiencing exponential decay, falling quickly at first and then levelling
+out. This was about as expected. The voltage falls, as the LED is too hot, then it reaches closer
+and closer to equilibrium, where the total thermal output is the same as the power input.
+.NH 2
+Takeaways
+.LP
+From my data I can take away that LED's are definitely thermally limited, one can see this from
+today's data and yesterdays data. I have found it interesting how the LED can heat up so slightly
+and yet it still have an effect on the voltage input. One would suppose there is a formula to model
+this decay in voltage.
+