Although the terms are similar, electric potential and electric potential energy are not the same. While energy is measured in joules, volts are the units of electric potential. Also, electric potential is the amount of potential energy, or work, for each charge. Like other changes in energy, electric potential energy is based on force and displacement. This photograph contains different types of batteries. Although batteries may have different sizes, the amount of potential energy per charge can the same for all of them. However, the size of the battery determines how long it lives. Smaller batteries do not last as long as larger ones with the same voltage because a larger battery can keep more potential energy.
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