A stable or unstablecircuit can be explained with the tendency of initial variation of circuit variables relative to the equilibrium solution, and can be discriminated on the feedback gain.
稳定电路或不稳定电路可用电路变量相对于平衡解的初期量变趋势来解释，而由反馈增益加以判断。
2
EDM in gas can make less electrode wear, but its high short circuit ratio will lead to unstable process and thus low material removal rate.