I have to accounts on this site( from two different addresses of course) ; am I able to use one to up vote the others Q's or A's
Definitely not. Doing so is likely to get your accounts suspended and all the votes undone.
if the second account allows you to do something on the site that your normal account would be prevented from doing, it is abuse.
Basically, don't use your new account to circumvent any regular rules, such as not being able to vote on your own posts. If you stick to that then we'll leave you alone.