The method with which energy is stored for later use.

• A. Embodied energy
• B. Energy storage
• C. Eco-design
• D. Dematerialization

Answer: (B)

The key idea is energy storage—the system or method that holds energy so it can be used later. In design terms, energy storage provides a reservoir of energy that can be drawn upon when the primary energy source isn’t available or when a device needs power on demand. Examples include batteries in phones or laptops, which convert and store chemical energy for later electrical use, or other storage forms like flywheels or thermal storage.

Embodied energy refers to the total energy required to manufacture, transport, and assemble a product; it’s about the energy embedded in the product, not about keeping energy for later use. Eco-design focuses on reducing environmental impact across a product’s life cycle, not specifically on storing energy. Dematerialization means using fewer materials, which also isn’t about storing energy. So the term that best describes the method of storing energy for later use is energy storage.