What device is commonly used for buffering in electrical circuits?

In electrical circuits, an inductor is commonly used for buffering because it can store energy in its magnetic field when current flows through it. This energy storage capability allows inductors to smooth out variations in current, making them effective in applications such as filter circuits and power supply regulation. When the current through an inductor changes, it induces a counter electromotive force (EMF) that resists the change, effectively buffering the circuit against sudden fluctuations in current.

This property is particularly useful in applications where maintaining a stable current is critical, as inductors help to dampen sudden changes in electrical flow. In contrast, transformers primarily serve to change voltage levels between circuits, resistors dissipate energy as heat and do not buffer, and circuit breakers are designed to interrupt current flow to protect against overloads. Thus, the inductor's unique ability to manage and stabilize current flow makes it the best choice for buffering in electrical circuits.