I know I did something stupid, but I still can't figure it out, and that led to electrocuting myself and melting down my jumpers (wires). So I was using my multimeter to measure the voltage of a battery (lithium-ion 12V,3A), and everything went smoothly until I tried to measure the current...so I did change the position of the multimeter lead (the red one) so I can measure the current and I rotated this wheel to the 200mA option, I didn't see a reading (but I smelled something burning), so I changed to the 20mA option and then there was a spark and I got electrocuted and the jumper wire which is connected to the left terminal got melted. I want to know why did this happen, and how I can avoid it. Thanks in advance.
Note:
A picture of the setup is attached to this post.
Note:
A picture of the setup is attached to this post.