Why do capacitors need a resistor to discharge?
A charged capacitor contains a certain amount of potential energy. The inclusion of a resistor on the discharge circuit involves a potentially destructive spark.
Capacitors charged at high voltages may present a risk of electrocution. In such cases, resistors are used to discharge the capacitors in order to reduce the voltage quickly after the power failure.
Resistances are not strictly necessary, but they are generally the most economical way to perform this function.
Capacitors do not need resistance to discharge. If you have no resistance, it will discharge quickly.
You want to slow it down by having a resistance. Of course, if you do not have another passive battery or battery connected to the battery, the capacitors do not need resistance to discharge when you short-circuit both sides of the capacitors.
It’s for security reasons.
When the capacitor is disconnected from the circuit, a load will exist at its terminals depending on the location of the sine wave. This can be up to 1.41 times the rated voltage of the network.
On large high-voltage mains capacitors, a serious explosion may occur during an accidental short circuit. (A 10-minute discharge time is often allowed before short-circuiting the capacitor terminals.)
On DC circuits, the capacitor retains a charge that is often caused by the load of the circuit in question.
Caps can be unloaded without resistance.
Use a conductor to short-circuit their wires, but some plugs, because of the heavy load, could cause a short and rapid discharge that can damage the plug.
And if in the circuit, then during operation, we could not have a short circuit on the heading or course.
In high voltage circuits, resistors are placed on the caps to discharge when shut down for safety reasons.
Unload the caps to make sure they do not provide high voltage while servicing the equipment.
However, it is never safe to assume that a plug has been discharged when servicing equipment.
After a while, I make large caps just to make sure. I could also leave the shorts on speed while I work on it.
Two points with a difference in electrical potential want to be balanced. That’s the nature of the electron flow.
If a plate of one capacitor has an excess of electrons with respect to the other plate, there is a potential difference.
A capacitor can be discharged in two ways. We fly around or through its dielectric (insulator). It speaks of the quality of the capacitor.
Another way is through his tracks. It can be discharged through a resistor or a short circuit. Even the air has a resistance that varies with humidity.
If the two plates are electrically coupled and the electrons have a path to migrate from one plate to another, they will do so.
The resistance between the plates is the path that makes this possible, sometimes even when the resistive path is air.
The short circuit of a charged capacitor can damage it.