Physics — Capacitance

C = \frac{Q}{V}

C = \frac{\varepsilon_0 \varepsilon_r A}{d}

U = \tfrac{1}{2}CV^2 = \tfrac{1}{2}QV

C_{\parallel} = \sum_i C_i, \quad \frac{1}{C_{series}} = \sum_i \frac{1}{C_i}