Today the advanced materials that are used in industries like aeronautic, automotive, mold and die industries, has triggered the application of advanced machining processes to fulfill the requirements for material forming, dimensional accurate, and surface finish for machining of hardened and brittle materials. Among advanced machining processes for facing these challenges is being explored the application of the electrochemical discharge machining. This machining process has a complex dynamic behavior, the electrodischarge phase erodes the workpiece through thermal mechanism, whilst electrochemical phase dissolves the workpiece through the current density, Faraday’s laws. This paper highlights the process of energy transformation through the power supply, tool, electrolyte and workpiece by means of a conceptual/functional model. Holes were made in a workpiece of high strength low alloy steel, a brass tool, and sodium chloride dissolved in deionized water like electrolyte. Respective microstrure analysis and measure of material removal rate and surface roughness were developed.