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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 PI from 12V
step down the voltage safely would be to use a microUSB mobile phone car charger such as this
Also I figure that the Pi should only be drawing about 2.5W (5V x 500mA) so the demand on the available power …