Question

Voltage at region is V= 20,000 V. What is the voltage expressed in J/C? The kinetic energy that each electron acquires is U=QV which is also 1 V/m = 1 J/C. What is the electric field of this configuration in both units? And that electric charge -Q feels potential energy in that electric field of U. From that relationship, what is that energy in Joules? If the distance between the plates had been twice as big, what would the energy be?

Answer 1

It's important to know that electric potential energies are measures in Joules (J), and electric charges are measured in Coulombs (C). Now, the electric potential is obtained by dividing the electric potential energy by the electric charge, which gives electric potential as a result expressed in Volts or J/C, that's what the unit J/C means.

Therefore, the voltage expressed in J/C refers to the electric potential energy, the ratio between Joules and Coulombs.