| In this chapter, capacitors and inductors will be introduced (without considering the effects of AC current.) The big thing to understand about Capacitors and Inductors in DC Circuits is that they have a transient (temporary) response. |
This chapter will introduce capacitors and inductors (AC regulation). The main thing to understand about capacitors and inductors in DC circuits is that they have a transient (time) response. |
| During the transient period, capacitors build up charge and stop the flow of current (eventually acting like infinite resistors.) Inductors build up energy in the form of magnetic fields, and become more conductive. |
During the transition period, capacitors store charge and stop current (eventually acting like infinite resistors). Inductors store energy in the form of magnetic fields and become more conductive. |
| In other words, in the steady-state (long term behavior), capacitors become open circuits and inductors become short circuits. |
In other words, in steady state (long-term behavior) capacitors become open circuits and inductors short circuits. |
| Thus, for DC analysis, you can replace a capacitor with an empty space and an inductor with a wire. |
So, for DC analysis, you can replace the capacitor with an empty space and the inductance with a wire. |
| The only circuit components that remain are voltage sources, current sources, and resistors. |
The only remaining circuit components are voltage sources, current sources, and resistors. |
| DC steady-state (meaning the circuit has been in the same state for a long time), we've seen that capacitors act like open circuits and inductors act like shorts. |
In steady-state constant current mode (which means that the circuit is in the same state for a long time), we have seen that capacitors act as open circuits and inductors act as short circuits. |
| The above figures show the process of replacing these circuit devices with their DC equivalents. |
The figures above show the process of replacing these circuit devices with their DC equivalents. |
| In this case, all that remains is a voltage source and a lone resistor. |
In this case, only the voltage source and a lone resistor remain. |
| (An AC analysis of this circuit can be found in the AC section.) |
(An AC analysis of this circuit can be found in the AC section.) |
