Under the T-topology, the derivation of the “image” form of this quantity is necessary for analyzing constant k-filters. Matching two forms of this quantity is required for the extended form of Jacobi’s law. The open-circuit test is used to find the no-load form of this quantity (-5[1])in transformers. (-5[1])To solve transmission line problems, (15[1])a circular transformation (15[1])of the complex plane is mapped to a chart mainly for this quantity named after Philip (*) Smith. This quantity for capacitors and inductors is “one over jwC” and “jwL,” (-5[1])respectively. This quantity is often complex, thus it’s represented as “R plus jX,” where X is the reactance. Just like its DC counterpart, this quantity’s (10[1])units are in ohms. (10[1])For 10 points, name this quantity (-5[1])defined as the (10[1])alternating current form of resistance, symbolized Z. ■END■ (10[1]0[1])