Alcohol sensor MQ303A


I just received this sensor:

I am no too sure how to test it, because according to this old thread (,16715.0.html) I need extra current for the heater (120mA), that my Arduino Uno just can't supply.

I have a 9V battery, but I can't find the current, and don't have a multimeter either. I want to make sure I don't blow anything up, I got a couple of 5V and 3.3V regulators too.

And besides all this, any guide to get familiar with electronic basics, current, voltage, how to calculate resitors would be really helpful, if you know one. I've been making a lot of projects and luck has been on my side not to burnout anything (so far)