Power supplies are available in a wide range of voltage and current ratings. If I have a device that has specific voltage and current ratings, how do those relate to the power ratings I need to specify? What if I don’t know the device’s specs, but am replacing a previous power supply with particular ratings?
Is it OK to go lower voltage, or should it always be higher? What about current? I don’t want a 10 A supply to damage my 1 A device.