# Quick current question

1. Nov 2, 2005

### QueenFisher

a very simple question that i have no idea about:
can you say that a current of 1A to the right is also a current of -1A to the left?

2. Nov 2, 2005

### Kyon

Well, I don't really know, but that's what happen when you invert the inputs of an amperemeter.

So, it's either a device convention to tell you the current go the other way or intensity is really counted negatively.

In fact, I don't really know neither, but I'm sure a guru is gonna answer us :p

Kyon

3. Nov 2, 2005

### Kyon

After a quick google search, I think I've found the answer: using + and - for current intensity is just a convention to indicate the direction of the current.

Positive intensity if the current go in the same direction as you decided on your drawing, negative otherwise. Just a convention.

When you calculate intensity, I guess you should get positive results only.

Kyon.

4. Nov 2, 2005

### QueenFisher

well, i was wondering about it in the context of working out current into/out of junctions, and it seemed important

cheers!