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Power is the rate at which energy is supplied or consumed, often measured in Watts. This tag covers electrical power specifically, the voltage and current specifications for supplying power to the Pi, the specifics of power consumption by the Pi, and methods for controlling Pi power consumption.
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Powering a RPi with +24VDC for an industrial application
Otherwise you need to dissipate great power on 24V/3A (about 57W). I doubt that any linear regulator will survive this.
There are a lot of switching DC-DC step-down modules ready to use. … You can connect 5V directly to the expansion header, but then you shouldn't connect any power supply through USB. …