Translate the given verbal statement into a differential equation using appropriate mathematical notation. Write the equation in a form so that the constant of proportionality is positive Identify every letter that appears in the equation. A basic electrical circuit that is usually considered in elementary physics courses consists of a switch that can be opened or closed, a battery, a resistor, and a capacitor connected in series When the switch is closed, an electrical current begins flowing through the circuit.: however, it immediately begins to decrease to zero The rate of change of the current at a given moment is proportional to its value at that moment.