Generally speaking it doesn't do that. Ohms Law E/I*RShawn wrote:Be careful with low voltage...
Ohms law..When voltage goes down.Current(amps) goes up...
Low voltage/ high current usually creates more HEAT which is bad for electronics.
When voltage goes down in electronics so does the amperage; There is some 'funny stuff' that goes on with voltage regulators/converters where say in a laptop with an 11.4V battery runs the system, and 19V is the input that is converted to a lower voltage to charge batteries AND run the system; Where assuming it didn't have a low voltage disconnect(most do unfortunately for ME*) the system would draw more current to makeup for the overall shortfall in voltage to keep everything going the status quo; But never anywhere near levels where heat would be an issue(IMO); as remember the system IS running on 12V already; AND the closer two voltages are to one another the more efficient(Less waste heat) the conversion.
ie: buck step up adapter I posted earlier, may be 92% efficient going from 16V to 19.5V DC, but it's only ~80% efficient going from 12.2V to 19.5V.
I admit I get a lot of my info from actually testing myself looking at I/O voltages and current; But also my father was an electronics geek from the 60's,and has been a great help.
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Just looking at https://en.wikipedia.org/wiki/Ohm's_law
I = V/ R
12V / 100 Ohms = 0.12Amps
10V / 100 Ohms = 0.10Amps
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If I can't find a fellow who owns toughbooks and does these kinds of tests, I'm thinking I'll spend $80~ or so on a CF-T8 or similar just to test to see if it will run on a lower than rated voltage on the DC jack. The SU9600 CPUs are very power efficient with a TDP of only 10W; Granted theres much faster cpus that take the SAME power, but nothing anywhere near as cheap.