How did they know that Franklin got it wrong

[Onceler]

before diodes.
and how far back?
how do we know that the schematics now have the proper electron current it is all showing electrons to ground(very insulting to the electron).?

 

[Ben90]

I don't think the USS Franklin got very good gas mileage.

 

[DrPizza]

Back up a couple of steps. Others before Franklin deduced there were two types of charge. You can demonstrate this with anything to objects than when touched together and separated demonstrate the build-up of "static electricity." (Rubbing merely increases the mount of contact and separations.) Franklin thought that the two things were just one thing - and it flowed from higher pressure to lower pressure, thus coined positive and negative. Things flowed from positive to negative. We know that there are two types of charge, now called "positive" (protons) and "negative" (electrons.) And, you know which one moves.

So, we know that electrons move from where there's a surplus of them to where there's a deficit of them. But, Franklin had already termed the place where there's a deficit of electrons as "positive."

 

[Ken g6]

Apparently, Sir William Crookes was the one who discovered that the moving thing in an electrical current was negatively charged, using a cathode ray tube and a magnetic field.

 

[who?]

There are electrons and holes.Hole current travels positive to negative.

 

[ussfletcher]

There are electrons and holes.Hole current travels positive to negative.

Holes don't travel, though they can appear to.

 

[imagoon]

You also need to be careful, in liquids and gases where the positive ions are free moving, they also will flow, generate and be affected by magnetic fields etc.

 

[balsa model]

Every now and then, I run into people obsessed about fixing the "correct" direction of the current. If we just renamed 'electron' to 'negitron', would they finally stop?

Two hundred years ago, people knew that they didn't know what exactly flowed and which way. But they did realize that they NEEDED a CONVENTION for such a direction, so they can get on with the business of publishing results of repeatable experiments, come up with law, etc.

The guess was inopportune but changing a useful convention is a no-no.
It's like driving on the right side of the road. You can convince everyone in your village to change one day, but unless you get the whole landmass, you're gonna have problems, bro.

I suggest you keep the convention same as what your current meter assumes. And if you find one that shows negative value for current flowing from battery (+) to (-), please post the brand name and model type. I would like to know.