Let's say you have a circuit with a resistor, capacitor and voltage source and a switch. I got a few questions. 1. The instant the switch is closed, the voltage drop would all be across the resistor right? 2. After a long time the switch is closed, the current would approach 0 and the voltage drop would be all across the capacitor? The above is charging a capacitor. Below is discharging If we have the same circuit, except that the switch was initially closed for a long time then opened. 1. The voltage the instant the switch is opened would be all across the capacitor still right? 2. After a longtime when, the charge on the capacitor has diminished, how would you calculate the current/voltage across the resistor?