1)I do understand why current must be same at all points in series as charge is conserved. BUT, If a current, say 'I' is created in a loop, then why, exactly, do we say that the current in a part or element of the wire is the same, that is, 'I'?? Why is current independent of the length of wire we consider. 2)Also, if we define current through a cross-section, then why do we say that a current exists in a wire(conductor) of a finite length. I have searched and thought a lot about it, and have also found solutions like the definition of current is rate of flow of charge, that is amount of charge passing a cross section in unit time. How does this conclude the problem? This is not getting into my head and I can't understand this. PLEASE HELP.