why we consider the current flow in reverse?

Question

electrons are flowing from -ve terminal to +ve terminal.... but we say the current flow is from positive to negative..can anybody explain me the logic?

Answer 1

Dates back to the 1700's. The scientist of the day, and I think it was Franklin specifically, chose the idea that current was coposed of moving positive charges. This came from another arbitrary decision about whether certain substances created positive or negative charges when rubbed to make static electricity. When the electron was discovered, and it was found to be negative, and also be the charge carrier in current flow, it was too late to change the conventions. Too many things would have to be re-written, etc. So we have this dicotomy - current flow from pos to neg, while the electron, a negatively charge partilce, is the actual particle moving through a circuit and flows from neg to pos.

Answer 2

If we consider thr current flowing through a resistor in the direction opposite to the electron flow, the voltage "drops" across the resistor. That is, at the point where the current enters the resistor, the voltage is positive with respect to the point where the current leaves the resistor. That ultimately makes the math of network analysis a little more convenient.

That is not why the convention started in the first place, but it is one of the reasons that is wasn't changed later.

Answer 3

Everything's written that way now, so people don't want to change it. It's worth noting that in ice and p-type semiconductors (and sulfuric acid, too, I think) current flow is made up of positive charges flowing from +ve to -ve.

Answer 4

coz when u touch the -ve terminal, nothing happens and when u touch the +ve terminal, u see stars in daylight and u mistake them for so called electrons. Thats why.

Answer 5

complicated situation. seek from a search engine. it may help!