What does the power of switching power supply do?

The power of the switching power supply is the same as that of the vehicle. The car can't pull what the big car pulls, but the big car can pull the car.

See how many volts and amperes your appliance is. If it is lower than 12v 2A, two kinds can be used. If it is over 2A, only 12v 10A can be used. Burning things has nothing to do with the power of the power supply. It has something to do with voltage.