Final answer:
A battery is an object used to provide electrical currents to power a device. It converts chemical potential energy into electrical energy to power the movement of electrons through a circuit. Batteries are selected based on factors like mass, cost, reliability, and current capacity.
Step-by-step explanation:
A battery is an object used to provide electrical currents to power a device. It is an electrochemical cell that produces an electric current through a chemical reaction. When connected to a circuit, the chemical potential energy stored in the battery is converted into electrical energy, which powers the movement of electrons through the circuit. Batteries come in different shapes and sizes and are selected for specific applications based on factors like mass, cost, reliability, and current capacity.