1、2.1 Time-Varying Current and Voltage In Section 1.3, we have defined the current as the time rate of flow of charge, i.e., QI t= (1) This definition assumes the current does not change with time. However, the current in a circuit may vary with time, as the streamflow of a river varies with seasons.
2、In such circumstance, we define the current as the rate of charge change over the time: dqi dt= (2) Similar to the changing current, the changing voltage is referred to the rate of energy change over the charge as: dwvdq= (3) If the current and voltage in a circuit changes over time, we call such a circuit a dynamic circuit. A dynamic circuit is like the dynamic world and our energetic life, which is fantastic. We will talk about dynamic circuits in this chapter.
