1. Energy Transformations
The Good and the Bad p

2. Living things are dependent on energy transformations for life processes.

3. Chemical potential energy  thermal + radiant energy
Fire
Chemical potential energy  thermal + radiant energy
Positives:
Cook food
Keep warm
Keep predators away
Melt metal to make weapons & tools
Heat homes & baths

4. Negatives:
Environmental health problems (for ex: air pollution, exposure to chemicals)

5. Chemical potential energy  thermal energy
Cement
Chemical potential energy  thermal energy
Positive:
Create infrastructure (for ex: buildings, roads)
Negative:
Creates thermal energy
Releases CO2

7. Combustion of coal in steam engines
Chemical potential energy  thermal energy + mechanical kinetic energy
Positives:
Transportation
Machinery
Negative:
Air pollution

8. Chemical potential energy  electrical potential energy
Batteries
Chemical potential energy  electrical potential energy
Positive:
Portable energy source
Negative:
Leach toxic chemicals

9. Chemical potential energy  mechanical kinetic energy
Gas Engine
Chemical potential energy  mechanical kinetic energy
Positive:
Transportation
Negative:
Air pollution

10. Hydroelectric Dam Positive: Negatives: Provide large amounts of energy
Gravitational potential energy  mechanical kinetic energy  electrical energy
Positive:
Provide large amounts of energy
Negatives:
Flooding
Releases methane
Displaces people/animals

12. Nuclear energy  thermal energy  electrical energy
Nuclear Reactors
Nuclear energy  thermal energy  electrical energy
Positives:
Produce large amounts of energy
Treatment & diagnosis of medical conditions
Negative:
Radiation is harmful to life

13. Hazardous wastes produced by nuclear reactions are problematic.
Some waste products, like fuel rods, can be re-used
Some products are very radioactive, & must be stored away from living things.
Most of this waste is buried underground, or stored in concrete
It takes 20 half-lives (thousands of years) before the material is safe.

14. Chemical potential energy  electrical energy
Fuel Cells
Chemical potential energy  electrical energy
Positives:
Transportation
Space exploration
Negative:
Releases CO2

15. Cleaner Energy
choosing more sustainable technologies, ↓ energy consumption, & recycling
Methane cracking produces hydrogen fuel cells while releasing low amounts of CO2 emissions.
New ways of making cement are being considered to ↓ CO2 emissions
producing electrical energy through nuclear fusion.
Implementation of new safety inspections & safer technologies to prevent muclear accidents