What type of signals can an RC circuit effectively smooth?

An RC circuit, which consists of a resistor (R) and a capacitor (C), is commonly used in various applications for signal smoothing. The primary function of an RC circuit is to filter out fluctuations in signals, making it effective in both AC and DC applications.

For DC signals, the RC circuit can smooth out variations or ripples in the voltage level, providing a more stable output. This is particularly useful in power supply applications where a constant DC voltage is needed.

For AC signals, the RC circuit can act as a low-pass filter, allowing low-frequency signals to pass through while attenuating higher-frequency components. This feature is essential in audio applications or signal processing where you want to reduce noise or other high-frequency artifacts.

The versatility of RC circuits makes them invaluable in smoothing out both AC and DC signals, leading to the conclusion that they can effectively manage a wide range of signal types. This characteristic solidifies the correctness of the answer that states RC circuits can smooth both AC and DC signals.