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BATTERY

A battery is a type of electrical device called a power source. Power sources provide electrical current that can be used in a circuit. Besides providing current to a circuit, batteries also store energy that can be used to push the current through a circuit. A battery uses a chemical reaction to supply electric potential energy. Potential energy just means that the energy is stored for later use. Other types of power sources convert energy from one form into electric potential energy. For example, hydroelectric dams convert water pressure, wind turbines convert wind energy, and solar panels convert sunlight into electric potential energy. Voltage is the measure of potential energy. To be more specific, voltage is a measure of the difference in electric potential energy between two points. For a battery, those two points are the battery terminals. A battery has two terminals, a positive terminal and a negative terminal. The terminals are marked on the battery with a + sign and a - si
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