Physics › Section E · Work, energy, and power › Topic E.7
Energy in humans and world energy use
Your body and the world economy run on the same physics: energy is converted, a little becomes useful work, and most ends up as heat. Seeing both through the ideas of work, power and efficiency explains why exercise burns fewer Calories than you might hope, and why energy resources matter even though energy is conserved.
In this topic
- The body as an energy converter
- Food energy and the Calorie
- Metabolic rate
- Activity and efficiency
- Worked example: the cost of a climb
- Worked example: working off a snack
- World energy use
- Renewable and nonrenewable sources
- Energy, well-being and conservation
- Common mistakes to avoid
- Key takeaways
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