Raspberry only draws 0,025 amperes?

[cybtrash]

Hello,

I have a rasperry pi with a 2 ampere power adapter.
I measured the power consumption with a current measuring device.

Running at 700Mhz, it consumes 2,5W with 0,025A.
Running at 1000Mhz, it consumes 3W with 0,028A

How can this be? I thought the raspberry needs at least ~700mA, going up to 1+A when devices are attached?

Why does my measuring device only show that low number?
The measuring device is this one:
KD 302
http://www.reichelt.de/Energiemessgerae ... &OFFSET=16&

[Joe Schmoe]

Well, there seems to be something wrong with your math.

If it is drawing 2.5 W at 5v, that's 500 mA (= 0.5 A), right?

And that's about right. Basically, what I've heard is that the Pi itself takes about 500mA and the ethernet (on a model B) draws about 230 mA (when running full speed/full blast).

[mahjongg]

the low current numbers are on the mains 240V AC side of the power supply, not on the low voltage side!

[MongolSamurai]

Remember: Wattage is equal to voltage times amperage. When you step down the voltage, the amperage must raise to provide the same power to a device. 2.5 watts at 5v is about 0.5A, but 2.5 watts at 240v is a much lower number: 2.5w / 240v = 0.0104A

[Joe Schmoe]

the low current numbers are on the mains 240V AC side of the power supply, not on the low voltage side!

Well, yeah, that would explain it as well...

[cybtrash]

Thank you all for your answers, now I get it!