OK. I'm pretty sure my inexperience is going to show here. I had the task of finding out how much current a microprocessor was drawing. I was going to measure, with a multimeter, between the point after the power (using a AC to DC 5V) and ground. I didn't break the circuit and the microprocessor started smoking at the red probe. Damn.. was I shorting out the point after the power when I did this? But since it is current and not voltage, it shouldn't be. Does anyone have an explanation for why the microprocessor started smoking? Sorry, this description may be vague.
Back to my original task, I used a power supply to measure how much current the microprocessor was drawing. Is there any alternative way to measure the current without a power supply?