Step 1: Understanding the Question:
The question describes a device that can store electrical energy by creating an internal displacement of charges (polarization) when subjected to an electric field.
Step 2: Detailed Explanation:
Capacitor: A capacitor is a passive electronic component that stores energy in an electric field. It consists of two conducting plates separated by an insulating material called a dielectric.
When a voltage is applied, an electric field is established across the dielectric. This field causes internal charge polarization in the dielectric material (alignment of dipoles).
While the capacitor "conducts" displacement current during charging and discharging, the storage of charge is its primary characteristic. The polarized dielectric allows it to hold more charge at a given voltage.
Analysis of other components:
Resistor: Opposes the flow of current and dissipates energy as heat; it does not store charge through polarization.
Diodes: Semiconductor devices that allow current to flow in one direction only. While they have junction capacitance, their primary role is rectification.
Transistors: Act as switches or amplifiers by controlling the flow of current. They are active semiconductor devices.
Step 3: Final Answer:
A capacitor is the device characterized by its ability to store charge via polarization.