Which device is specifically designed to store electrical charge?

The device specifically designed to store electrical charge is the capacitor. Capacitors are used in various applications to store energy in the form of an electric field, consisting of two conductive plates separated by an insulating material, known as a dielectric. When a voltage is applied across the plates, an electric field develops, allowing the capacitor to accumulate charge.

This property makes capacitors essential components in circuits for functions such as smoothing voltage fluctuations, coupling and decoupling signals, and temporarily storing energy. Their capacity to hold charge is characterized by their capacitance value, measured in farads.

In contrast, inductors are designed to store energy in the form of a magnetic field, resistors limit the flow of electric current without storing energy, and transformers change the voltage level of AC signals but do not store electrical charge.