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I've never heard of that...? I've ran peltiers off PC power supplies. And the PC supplies had other things hooked up to them along with the pelts...
What would the resistor do? Slow the fan down... and offer some current limiting.
The fan will only pull the current it needs, the power supply will not push excess current into the fan. The power supply will only supply the amperage that connected components are pulling.
Is it possible for the fan to become a short circuit? In which case a small resistor in series with the fan will prevent the current from going damaging the power supply?
You say the supply is 10 amps though, how many watts is the peltier? And what voltage range is it designed for?
I'm curious, what are you planning on cooling with a 60w TEC?
If the fan becomes a short circuit, it will pull all 10 A. In this case, you would need a 120 W resistor to "protect" the fan. A 120 W resistor is VERY LARGE.