Matched load

A load matched to a source receives the maximum available power in the stated circuit model. For a real source resistance $R$ and open-circuit root mean square voltage $V_{\mathrm{oc}}$, a load $R$ receives voltage $V_{\mathrm{oc}}/2$ and power $V_{\mathrm{oc}}^2/(4R)$. For complex impedances, maximum power transfer instead uses conjugate matching under the usual linear-source assumptions.