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 in transformers. To solve transmission line problems, a circular transformation 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” (10[2])and (10[1])“jwL,” respectively. This quantity is often complex, thus it’s (10[1])represented as “R plus jX,” (-5[1])where X is the reactance. Just like its DC counterpart, this quantity’s units are in ohms. For 10 points, name this quantity defined as the alternating current form of resistance, symbolized Z. ■END■ (0[1])