I'm just now getting into electronics (I don't know why I waited so long) and I'm just figuring out some stuff. I picked up an Arduino kit from Vilros.com and a few other parts for my project.
I'm currently trying to work on a project that is basically a humidor keeper. Living in So.California, it's extremely dry here and I would like a perfectly controlled environment for my humidor. I purchased a few things like some humidity sensors (as an input obviously), a humidifier (basically a water canister with a sponge and tubes) some tube splitters and twist valves and most importantly, a small air pump.
The small air pump is what I'm having problems with at the moment. This is the pump. Obviously it's a 3v pump. I will be using the supplied 9v battery cable when the project is ready, so I understand I'll have to use resistors to bring the voltage down so I don't burn out the pump. As I said, I'm new to this, so I'm trying to figure out ohms law to find out what kind of resistor(s) I will need. The problem is, I don't know the amperage. Where would I find this?
I looked at the details for the pump and what looks like amps (or milliamps) is really just the product number. Can anyone help me out?
Right now, I have my equation as r=6v / ?i But where do I find the current?