I'm trying to test the DC current of a couple devices and I'm getting bizarrely high readings. I've never used a multimeter to measure current before so I'm probably doing something wrong. My multi is currently set to the 10A setting. I plug in a 12v 500mA wall wart and measure it and it reads 2.9. Then I try a simple rechargeable AA battery rated at 1900mAh and it reads 4.3! Lastly, I try a 12v 1A wall wart (unregulated, though, so it puts out around 16v) and it reads 5.8. I thought there was a pattern at first because for the first two power sources, the readings were 2.4 higher than rated for both, but the last one threw me off. What am I doing wrong?