But is the fan a 19v fan? Most of them are rated for 12v, so that may overheat and burn out too if left connected to 19v for a longer time. For powering a peltier your best bet would be a computer psu. I use a small desktop computer psu for mine, rated at 150w, and i still get enough extra power to use some fans, an arduino or other low power consumption electronics on the same psu.
.....Is this correct or am I still lost in the woods over here?
Ok, I think I am getting it. The PSU values of 19V and 5.27A are just that it will push 19V out and the amp is a rating, not a constant value. Meaning that it can push out max 5.27A or less, just not more. No matter what the amp draw is (as long as it is below its rating), the voltage will always be 19.If that is correct, then the resistance will vary across each device connected to it. So I have a fan that is taking 19V and drawing 0.25A meaning the resistace of the fan is 76 Ohms. The peltier would have to have a resistor set up infront of it to limit the voltage but at the same time it would limit futher the current available and pull even harder for that current, but would still have the same affect on the PSU.The device itself will pull the amps out instead of the PSU pushing them in. If the device exceeds the PSU limits, then things happen that can be bad.Is this correct or am I still lost in the woods over here?
If the fan uses a brushless motor (and many of them do) then extra volts will not materially increase speed. The 3phase module that converts the DC to an AC generally operates at fixed frequency ior at a frequency determined by an external temperature sensor.