We Spend About One-________ of Our Lives Sleeping

question 47

Multiple Choice

We spend about one-________ of our lives sleeping.

• A) fifth
• B) third
• C) half
• D) fourth

---

Definitions:

Fuel Cell

A device that converts the chemical energy from a fuel into electricity through a chemical reaction with oxygen or another oxidizing agent, often hydrogen-based.

Conversion Efficiencies

The ratio of useful energy output to total energy input in a system, measuring how effectively energy resources are converted and used.

Biomass Fuels

Renewable energy derived from organic materials such as wood, waste, and alcohol fuels used for generating electricity or producing heat.

R-value

A measure of thermal resistance, indicating the effectiveness of insulation materials in preventing heat transfer.