Page:Elementary lectures on electric discharges, waves and impulses, and other transients (Steinmetz 1911).djvu/20

 change of the stored energy, of whatever form this energy may be, leads to a transient.

$$\frac{i_2}{i_1}$$; that is, $$i'=i\times\frac{i_2}{i_1}$$.

Starting with current $$i_1$$, the transient follows the curve $$i$$; starting with $$i_2$$, the transient follows the proportional curve $$i'$$. At some time, $$t$$, however, the current $$i$$ has dropped to the value $$i_2$$, with which the curve $$i'$$ started. At this moment $$t$$, the conditions in the first case, of current i, are the same as the conditions in