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The methods for powering the Raspberry Pi (typically via its micro-USB connection.)

5
votes
Actually, yes - and as luck would have it, you are unlikely to get into minimum load issues either, because there is a 5V rail designated as the standby, so it's made to handle low-power applications …
answered Apr 1 '15 by user2813274
2
votes
The Pi isn't super energy efficient at idle, best would be to have a secondary circuit turn it on/off somehow - from what I have observed, the B+ Pi uses about 2 watts of power without any display con …
answered Apr 1 '15 by user2813274
1
vote
While the suggested 7805 will work, it is also incredibly wasteful - assuming your Pi takes 1A input at 5V, the remaining 19V will be dissipated as heat - 19W of it, which would require quite the heat …
answered Aug 25 '14 by user2813274
3
votes
The USB 2.0 specification allows a device to request up to 500mA on a standard usb 2.0 port (although many allow for "charging" ports with higher current). the Pi cannot supply 500mA on even a single …
answered Jul 27 '14 by user2813274