2006-11-29 05:09:42 · 3 answers · asked by shaun w 1 in Science & Mathematics ➔ Engineering
Current is defined as the movement of charge -- which can either be from the movement of electrons, or the movement of ions in solution. For metals (and circuits), current is produced when electrons move through the metal. In water, you can have ions (like Na+ and Cl-) which move in the solution. The key point is that charge has to MOVE for you to have current.
From a Physics point of view, if the amount of charge is 'Q', then current is defined as 'i = dQ/dt' where 'i' is current, and dQ/dT denotes the "change in current as a funtion of a change in time."
2006-11-29 05:16:53 · answer #1 · answered by Sam I AM 3 · 0⤊ 0⤋
Current is the flow of charge (electrons).
2006-11-29 05:13:55 · answer #2 · answered by Gene 7 · 0⤊ 0⤋
Direction of flow of positive charge.
2006-11-29 05:24:32 · answer #3 · answered by ag_iitkgp 7 · 0⤊ 0⤋