user-1: What must be the rule for upvoting an answer?
Must I upvoted every good answer or only the best one in a question?
Must I upvoted a minimal correct answer even if trivial answer? I'm thinking about an answer like "use a pull-up resistor" that just solve the problem.
Must I upvote a correct answer in every question I look at?

user10394: I don't think there can be any fixed rule, you have to go with you gut.
Normally I wouldn't up vote all answers, because it neutralises the vote if you vote for them all, but sometimes all the answers are good and you have to.
Personally I would down vote the answer "use a pull up resistor".  It doesn't explain why and that's more important.  I come here to learn things, and if I can share what I know, an instruction to do something fixes the immediate problem but doesn't fix the long term problem.
BUT that's just my opinion and you should go with yours. :)

-1: <p>What must be the rule for upvoting an answer?</p>

<p>Must I upvoted every good answer or only the best one in a question?</p>

<p>Must I upvoted a minimal correct answer even if <em>trivial</em> answer? I'm thinking about an answer like "use a pull-up resistor" that just solve the problem.</p>

<p>Must I upvote a correct answer in every question I look at?</p>
 10394: <p>I don't think there can be any fixed rule, you have to go with you gut.</p>

<p>Normally I wouldn't up vote all answers, because it neutralises the vote if you vote for them all, but sometimes all the answers are good and you have to.</p>

<p>Personally I would down vote the answer "use a pull up resistor".  It doesn't explain <strong>why</strong> and that's more important.  I come here to learn things, and if I can share what I know, an instruction to do something fixes the immediate problem but doesn't fix the long term problem.</p>

<p><strong>BUT</strong> that's just my opinion and you should go with yours. :)</p>
