ESCO Electrical Theory and Application 2025 – 400 Free Practice Questions to Pass the Exam

The component used to store electrical energy temporarily is the capacitor. A capacitor consists of two conductive plates separated by an insulating material, known as a dielectric. When a voltage is applied across the plates, an electric field is created, allowing the capacitor to store energy in the form of an electric charge.

Capacitors are essential in various applications, including filtering, smoothing out signals in power supplies, coupling and decoupling signals in circuits, and providing timing functions in oscillators. Their ability to rapidly charge and discharge makes them invaluable for applications that require temporary energy storage and quick release.

The roles of the other components differ significantly. Resistors, for example, are used to limit current flow and dissipate electrical energy as heat, while inductors store energy in the form of a magnetic field when current flows through them. Transformers are utilized to transfer electrical energy between two or more circuits through electromagnetic induction, which does not involve temporary energy storage in the same manner that capacitors do. Thus, the function of a capacitor as a temporary energy storage device distinctly sets it apart from the other options.