Science and Education Publishing Journal of Automation and Control 2372-3041 3 3 2015 12 15 The Block Diagram and Equations of State of the Bond Graph Example 62 66 EN Darina Hroncová Department of Mechatronics, Faculty of Mechanical Engineering, Technical University of Košice, Letná 9, 042 00 Košice, Slovak republic Alexander Gmiterko Tomáš Lipták AUTOMATION2015334 10.12691/automation-3-3-4 2015 7 21 2015 10 24 2015 12 13 The work shows the use the methodology of Bond Graph for modeling electric system of simple RLC circuit. Electrical model is solved by this approach at the level of its physical behavior. In this paper the method of generation of state equations system is discussed. Model of a simple electrical RLC circuit consisting of a resistor, an inductor, and a capacitor is taken. The differential equations describing the dynamics of the system are obtained in terms of the states of the system.