Electrosurgery is the application of a high-frequency electric current to biological tissue as a means to cut, coagulate, desiccate, or fulgurate tissue. In Electro Surgical Unit, the heat is transferred to tissue from a preheated object. The current heats only the electrode and does not pass through the patient’s body. True electrosurgery involves the cutting or coagulation of tissues by passing a high- frequency current through the target tissue