Which statement describes the chemical method?

• A. A battery used to produce DC power.
• B. A generator supplies AC power.
• C. A capacitor provides energy storage.
• D. A transformer changes voltage levels.

Answer: (A)

Chemical method means energy is produced from chemical reactions inside a device, turning stored chemical energy into electrical energy. A battery does this by redox reactions that release electrons, delivering direct current. In contrast, a generator uses mechanical energy to create electricity—typically alternating current—through electromagnetic induction, not chemical reactions. A capacitor stores energy in an electric field without any chemical change, and a transformer changes voltage levels by transferring energy between coils, again without generating energy. Therefore, describing a battery producing DC power best captures the chemical method.