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the following equation I = [tex]\frac{dQ}{dt}[/tex]

the previous equatin represents the instantaneous current in a conductor.

what exactly is the term dQ or dt saying. in calculus if i see [tex]\frac{dy}{dx}[/tex]

I know it means take the derivative of this with respect to x.

now from my understanding d is like delta but where as delta may deal with rather large changes etc d represents an infinitly small piece of something i.e. an infinitely small charge over and infinitely small time? is that what that is saying

and whatever meaning it does have is it related completely to calculus itself or is this a physics definition?

thank you...