Which device is used to store electrical energy in an electric field?

A capacitor is the device used to store electrical energy in an electric field. It consists of two conductive plates separated by an insulating material, known as a dielectric. When a voltage is applied across these plates, an electric field is created, and electrical energy is stored in that field. The amount of energy that a capacitor can store is proportional to the voltage across it and the capacitance, which is a measure of how much charge it can hold per unit voltage.

In contrast, inductors store energy in a magnetic field created by the flow of current through a coil of wire, which means they function differently from capacitors. A transformer is a device that transfers electrical energy between two or more circuits through electromagnetic induction, but it does not store energy itself. Resistors, on the other hand, are used to limit the flow of electric current in a circuit and dissipate energy as heat instead of storing it.