why the energy stored In batteries can't be used directly
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Because batteries transform chemical energy to electrical energy rather than storing electrical energy. Electrical energy, a more specific word tgan electricity, can be directly stored, however, just not as densely as chemical energy.
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A battery is a device that stores chemical energy and converts it to electrical energy. The chemical reactions in a battery involve the flow of electrons from one material (electrode) to another, through an external circuit. The flow of electrons provides an electric current that can be used to do work.
With an efficiency of 70-80%, energy is lost in the process, but it can be tapped into any time, especially peak demand hours. Its main disadvantage is the need for geographical height and water availability, thus restricting it to mountainous areas and often encountering environmental restrictions.
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