Name each term in the following Equation;

$\frac{\text{d}\text{e}\text{l}\text{Q}}{\text{d}\text{e}\text{l}\text{t}}+gA\frac{\text{d}\text{e}\text{l}\text{y}}{\text{d}\text{e}\text{l}\text{x}}+\frac{\text{d}\text{e}\text{l}\frac{Q^2}{A}}{\text{d}\text{e}\text{l}\text{x}}=gA(S_0-S_{})$