What is a common application of capacitors in electrical circuits?

Capacitors are commonly used in electrical circuits for filtering and smoothing out voltage fluctuations. This application is particularly important in power supply circuits where stable voltage levels are necessary. When there are changes in load or sudden surges in current, capacitors can store and release energy quickly to help maintain a steady voltage. This function smooths out variations in the output voltage, which is crucial in ensuring that sensitive electronic components operate reliably without experiencing disruptive voltage spikes or dips.

The filtering capability of capacitors is also utilized in applications such as audio equipment, where they can help eliminate noise and ripple from power sources. By integrating capacitors into circuits, engineers can create more stable and efficient electronic systems that enhance overall performance.