What name is given to the work done per coulomb of charge passing between two points?

The name given to the work done per coulomb of charge passing between two points is called Electric Potential Difference or Voltage.

Here are the steps to understand this:

1. The work done on a charge is related to the force exerted on the charge and the distance over which this force is applied. This is a basic principle of physics.

2. In the context of electricity, this force is exerted by an electric field, which is created by a difference in electric charge between two points.

3. The work done on a charge to move it from one point to another in an electric field is given by the product of the charge and the electric potential difference (or voltage) between the two points.

4. Therefore, if we consider the work done per unit charge (i.e., per coulomb of charge), this is equivalent to the electric potential difference between the two points. This is why the term "voltage" is often used interchangeably with "electric potential difference".