  The detail structure of energy output and the dynamic characteristics of
electric spark discharge process have been studied to calculate the energy of
electric spark induced plasma under different discharge condition accurately. A
series of electric spark discharge experiments were conducted with the
capacitor stored energy in the range of 10J 100J and 1000J respectively. And
the resistance of wire, switch and plasma between electrodes were evaluated by
different methods. An optimized method for electric resistance evaluation of
the full discharge circuit, three poles switch and electric spark induced
plasma during the discharge process was put forward. The electric energy
consumed by wire, electric switch and electric spark induced plasma between
electrodes were obtained by Joules law. The structure of energy distribution
and the dynamic process of energy release during the capacitor discharge
process have been studied. Experiments results showed that, with the increase
of capacitor released energy, the duration of discharge process becomes longer,
and the energy of plasma accounts for more in the capacitor released energy.
The dynamic resistance of plasma and three poles switch obtained by energy
conversation law is more precise than that obtained by the parameters of
electric current oscillation during the discharge process.
