The net electric current in arc is electron current - ion current ion current - arc current electron current + ion current only determined by ion current

It seems like you're asking about the net electric current in an arc. The net electric current in an arc is determined by both the electron current and the ion current.

Here's a step-by-step explanation:

1. An electric arc is a discharge of electricity through a gas-filled space between two electrodes. This discharge is facilitated by ions and electrons.

2. The electron current refers to the flow of electrons from the negative electrode (cathode) to the positive electrode (anode).

3. The ion current refers to the flow of ions from the positive electrode (anode) to the negative electrode (cathode).

4. The net electric current in the arc is the sum of the electron current and the ion current. This is because both types of particles carry charge and contribute to the total current.

5. Therefore, the net electric current in an arc is not determined by the ion current alone, but by the combination of both the electron current and the ion current.

I hope this helps! Let me know if you have any other questions.