when do you use affected and when do you use effected? For example,"how were you (affected/effected) by going to that college?"

Answer 1

http://grammar.ccc.commnet.edu/grammar/notorious.htm
See # 95.

http://dictionary.reference.com/browse/affect
and
http://dictionary.reference.com/browse/effect
As verbs ...
affect means the same as influence
effect means to make something happen, to bring it about

As nouns ...
affect (pronounced aa-fect, not uh-fect) refers to behavior
effect refers to the result of some influence

Answer 2

In your sentence, you should choose "affected." Do you see why?