A stable or unstable circuit 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。

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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.

气中电火花加工时电极相对损耗很小，但由于短路率过高导致加工不稳定、材料去除率不高，还会产生烧焦气味。

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