An electrocautery apparatus, comprising: a plurality of adjacent first electrodes forming a first electrode array (104, 104A, 104B); at least one second electrode, a power supply having outputs electrically coupled to the first electrodes and said at least one second electrode; means for selectively applying a voltage from the power supply between two or more electrodes among any of the electrodes in the first electrode array and said at least one second electrode; and means for determining the area of tissue coverage of at least one of any of said first electrodes and said at least one second electrode, characterised in that said power supply comprises an RF generator selectively operable by said means for selectively applying a voltage from the power supply to insert a conjugate impedance in the form of an inductance to cancel out capacitive reactance with a fully covered electrode and to permit measurement of phase-angle of RF voltage and current; wherein when an electrode is only partially covered, capacitance changes; and wherein, as a result, reactance and phase-angle of RF voltage and current change, and wherein said means for selectively applying a voltage from the power supply further comprise an RF generator control algorithm for changing RF generator frequency upon detection of smaller electrode surface areas to maintain maximum power transfer while minimizing electrical arcing and suboptimal and/or excessive energy delivery, and wherein said means for selectively applying a voltage from the power supply further comprise means for detecting electrical arcing and preventing suboptimal and/or excessive energy delivery by determining rapid changes in phase and/or impedance, and wherein said means for detecting electrical arcing and preventing suboptimal and/or excessive energy delivery are further configured to signal said RF generator control algorithm to shorten or change treatment parameters when electrodes are only partially covered by tissue. a plurality of adjacent first electrodes forming a first electrode array (104, 104A, 104B); at least one second electrode, a power supply having outputs electrically coupled to the first electrodes and said at least one second electrode; means for selectively applying a voltage from the power supply between two or more electrodes among any of the electrodes in the first electrode array and said at least one second electrode; and means for determining the area of tissue coverage of at least one of any of said first electrodes and said at least one second electrode, characterised in that said power supply comprises an RF generator selectively operable by said means for selectively applying a voltage from the power supply to insert a conjugate impedance in the form of an inductance to cancel out capacitive reactance with a fully covered electrode and to permit measurement of phase-angle of RF voltage and current; wherein when an electrode is only partially covered, capacitance changes; and wherein, as a result, reactance and phase-angle of RF voltage and current change, and wherein said means for selectively applying a voltage from the power supply further comprise an RF generator control algorithm for changing RF generator frequency upon detection of smaller electrode surface areas to maintain maximum power transfer while minimizing electrical arcing and suboptimal and/or excessive energy delivery, and wherein said means for selectively applying a voltage from the power supply further comprise means for detecting electrical arcing and preventing suboptimal and/or excessive energy delivery by determining rapid changes in phase and/or impedance, and wherein said means for detecting electrical arcing and preventing suboptimal and/or excessive energy delivery are further configured to signal said RF generator control algorithm to shorten or change treatment parameters when electrodes are only partially covered by tissue.