Einheitenbetrachtung:
k sei die Einheit von a
{\large \begin{array}{l}\left[ E\,=\,a\,\cdot \,C \right]\,=\,1\,J\,=\,1\,k\cdot \,F\,=\,1\,k\,\cdot \frac{As}{V}\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,1\,Ws=\,1\,k\cdot \frac{As}{V}\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,1\,V\,A\,s\,=\,1\,k\cdot \,\frac{As}{V}\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,1\,V\,=\,1\,k\cdot \,\frac{1}{V}\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,k\,=\,1{{V}^{2}}\end{array} }
Die Einheit des Proportionalitätsfaktors a ist 1 V2.