In electrical terminology, 'E' stands for Electromotive Force (emf), which is the energy per unit charge provided by a source, while 'I' represents Current Intensity, which is the rate of charge flow.
The electrical designations E and I refer to Electromotive Force (emf) and Current Intensity, respectively. Not mentioned in the choices provided, but I conventionally stands for the current or intensity of the electric current, which is dependent on the rate of charge flow. E refers to emf, which is the energy per unit charge added by a source, contrasted with voltage, which is the energy per unit charge across an electric component.
The force electrostatic force is related to the charge and described by Coulomb's law, which states that the force between two point charges is proportional to the product of their charges and inversely proportional to the square of the distance between them.