I find that when you're talking about technical things on the internet, it's best to assume the other person knows common knowledge and only doesn't know the id

I find that when you're talking about technical things on the internet, it's best to assume the other person knows common knowledge and only doesn't know the idea you're trying to express. It's almost impossible that the GP didn't know V=A*h so pointing it out is more of an insult than anything useful.