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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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Can you use a Raspberry Pi to write code that powers an onboard LED or motor or fan?
to transistors
http://www.technologystudent.com/elec1/transis1.htm
I would not recommend using the GPIO pins as a power source for things like motors, or directly hooking up power sources to the GPIO … pins, as doing those things could deprive the Pi of power, or damage it. …