Which component mainly relies on dielectric material to function properly?

The component that primarily relies on dielectric material to function properly is the capacitor. A capacitor is an electronic component designed to store electric charge temporarily. Its fundamental operation depends on the presence of a dielectric material—an insulating substance placed between two conductive plates.

This dielectric material is crucial because it increases the capacitor's ability to store charge by enhancing the electric field between the plates without allowing current to flow directly through it. The dielectric constant of the material directly affects the capacitor's capacitance value, which defines how much energy the capacitor can store.

In contrast, while inductors and transformers utilize magnetic fields and can involve dielectric materials in some construction aspects, their primary functionality does not rely on dielectrics in the same way that capacitors do. Resistors, on the other hand, function to limit current flow without the requirement of a dielectric, as they are primarily based on the material's resistance to current. Thus, the key role of dielectric material in capacitance makes the capacitor the correct choice among the given options.