# Outline of energy storage

The following outline is provided as an overview of and topical guide to energy storage:

Energy storage – accomplished by devices or physical media that store some form of energy to perform some useful operation at a later time. A device that stores energy is sometimes called an accumulator.

## History of energy storage

Main article: History of energy storage

## General energy storage concepts

1. Using a high density magnetic field. Energy E in terms of magnetic field strength B is

$E = \frac{1}{2}B^2 = \frac{1}{2}Li^2$

where L is the inductance of the electromagnet and i is the current.

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