So good pot odds = EV+?

[Scrimmage]

I've been reading some posts regarding pot odds and EV; I still don't completely understand EV.

I think I am starting to get it, though.

So if the pot is 20$ and I have to call a $10 bet, my pot odds would be 1/3 ($10/$30), correct? Therefore if my chance of hitting my out is greater than 33% it is a EV+ play, correct? Or am I totally missing the boat?

Also, are there other considerations for calculating EV? I've been reading the strategy section also, and I can't seem to stumble on much about it. If there's a post explaining EV somewhere in there I'll read that if someone can post a link etc. I seem to see a lot of posts saying basically "Don't make -EV plays" etc, but I've had a hard time finding a post explaining it.

Again sorry for posting something that has probably been covered 100 times.

[chardrian]

EV = expected value.

+ EV simply means that the play you are making should make you money OVER THE LONGRUN (important to remember that last part).

-EV means that the play you make should lose you money over the longrun.

As a beginner the most important detail that goes into the EV equation is pot odds. But the more you play the more you'll realize that EV is not based simply on pot odds alone - your position, your stack, your reads, implied odds, fold equity, etc. will all come into the equation at some point. And making it even trickier is that some players will disagree as to how much you should value these other factors when making your EV evaluations.