between the conductors A spark is generated between two conductors when the distance intensity be- is small compared to the diameter of the conductors and when the electric field the distance tween the conductors is approximately 3 Mvim. A brush discharge is generated if between the conductors is large compared to the radius of curvature of the conductor. The energy of a spark discharge is a function of the accumulated charge (Q in coulombs) on the object, the capacitance of the object (C in farads), and the potential, or voltage (V in volts) of the object. These three variables are related by the expression C Ql V. The actual energy (expressed in joules) associated with the discharge process is given by