Most batteries are classified as

• A. Chemical cells
• B. Magnetic devices
• C. Electrical generators
• D. Mechanical stores

Answer: (A)

Batteries store chemical energy and deliver electrical energy through electrochemical reactions. Each cell inside a battery contains electrodes and an electrolyte; chemical reactions at the electrodes push electrons into an external circuit, producing current. A battery is essentially one or more of these cells connected together to provide more voltage or capacity. The other options don’t fit because a magnetic device relies on magnetic fields, a generator produces electricity from another energy source rather than storing it, and a mechanical store holds energy in a physical form like a spring or flywheel, not as chemical energy.