What is the purpose of a resistor used on a capacitor?

The primary purpose of a resistor used on a capacitor is to bleed off voltage stored in the capacitor. When a capacitor is charged, it holds a certain amount of electrical energy, and if this capacitance is not discharged after use, it can remain charged for extended periods. A resistor allows for a controlled discharge of this stored energy, preventing the capacitor from posing a shock hazard.

Using a resistor to bleed off voltage ensures that the capacitor is safely discharged before performing maintenance or making changes to the circuit. This application is vital for the safe operation and longevity of electronic components that rely on capacitors, as it helps to mitigate the risks associated with unexpected voltage spikes caused by charged capacitors. This function is particularly important in applications where capacitors are charged to high voltages or in sensitive electronic devices that could be damaged by residual energy.

In contrast, attempting to increase the voltage stored in the capacitor involves different mechanisms, such as using a power source or altering the circuit configuration. Similarly, while the resistor influences current flow, its role in this context is specifically to safely release the energy stored in the capacitor rather than just regulating current flow.