Capacitance Formulas

Here are formulas from the AQA data booklet which might prove useful for this topic:

• capacitance \[C=\frac{Q}{V}\] \[C=\frac{A\varepsilon_{0}\varepsilon_{r}}{d}\]
• capacitor energy stored \[E=\frac{1}{2}QV=\frac{1}{2}CV^{2}=\frac{1}{2}\frac{Q^{2}}{C}\]
• capacitor charging \[Q=Q_{0}\left(1-e^{-\frac{t}{RC}}\right)\]
• decay of charge \[Q=Q_{0}e^{-\frac{t}{RC}}\]
• time constant \[RC\]