Registered Sleep Technologist Exam 2025 – 400 Free Practice Questions to Pass the Exam

The correct choice recognizes the function of a capacitor within an alternating current (AC) circuit. Capacitors are electrical components designed specifically to store and release energy. They achieve this by accumulating electric charge when a voltage is applied; this stored energy can then be released back into the circuit when needed.

In AC circuits, capacitors help manage the flow of current and voltage, contributing to the circuit's overall performance by creating a phase shift between the voltage and current. Consequently, they play a vital role in filtering, smoothing, and stabilizing power signals, significantly affecting the efficient operation of circuits.

Inductors, while also components that store energy, do so in the form of magnetic fields, which is distinct from the electrical energy stored in capacitors. Resistors simply dissipate energy and do not store it. Transformers are not storage devices but instead transfer electrical energy between two or more circuits through electromagnetic induction. Understanding these roles clarifies why the capacitor is the correct answer regarding the storage and release of energy in AC circuits.