Which device stores energy chemically?

• A. Capacitor
• B. Inductor
• C. Battery
• D. Transformer

Answer: (C)

A battery stores energy chemically. Inside a battery, chemical reactions occur that store energy in the materials of the electrodes and electrolyte. When the circuit is closed, these reactions drive electrons to flow, converting the stored chemical energy into electrical energy.

Capacitors store energy as an electric field between two plates, not from chemical reactions, so they release energy differently and are not a long-term chemical store. Inductors hold energy in a magnetic field around a coil, again not chemically stored. Transformers transfer energy between circuits using magnetic coupling and don’t serve as a long-term chemical energy store.