What is the measure of the energy transformed between two points in an electric circuit?

Energy is not a physical unit. It is a philosophical concept and an accounting technique used to analyze mechanical and chemical exchanges. In nuclear physics it is defined as a wavelength of light, in biology it is a synonym for metabolism, and in public utilities they say energy when they mean connectivity. In an electric circuit you are concerned with volts, amps, and watts. You need to learn the basics. Here is a free course. www.phy.davidson.edu/instrumentation/NEETS.htm