"So we can see that the new Raspberry Pi B+ uses 1.21 Watts with just a keyboard dongle vs 1.89 Watts for the old...

"So we can see that the new Raspberry Pi B+ uses 1.21 Watts with just a keyboard dongle vs 1.89 Watts for the old model B. The difference, 0.68 Watts might not sound like a lot, but it’s 36% less power usage. This great if you’re running on batteries, or have a barely adequate solar panel."

Originally shared by Alex Eames

I thought I'd measure the power usage on the new B+ and compare it with the older model B. Let's see just how much better it is for low power applications :) There's also a video.
http://raspi.tv/2014/how-much-less-power-does-the-raspberry-pi-b-use-than-the-old-model-b  http://youtu.be/KQylhWFxapc
http://raspi.tv/2014/how-much-less-power-does-the-raspberry-pi-b-use-than-the-old-model-b