CHEE2695 – Lecture 2
Energy transformations:
- When one form of energy is converted to another, 100% efficiency is rarely
achieved.
- Energy is the ability to do work, derived from the utilisation of chemical
resources, especially to provide light or heat, or to work machines
(mechanical).
- Joules or Watt-hours are units of energy, whereas a Watt is a unit of a rate of
energy.
- Other units of energy include:
Unit Conversion
calorie (cal) 4.18 J
Calorie (Cal) 4180 J
British thermal unit (btu) 1055 J
1 ton of oil equivalent (Toe) 42 J
- A Sankey diagram is a good way to visualise energy transformations.
- Much more energy is produced than is used. This is due to losses caused by
inefficient processes.
- A countries energy flows can be represented as such:
Energy transformations:
- When one form of energy is converted to another, 100% efficiency is rarely
achieved.
- Energy is the ability to do work, derived from the utilisation of chemical
resources, especially to provide light or heat, or to work machines
(mechanical).
- Joules or Watt-hours are units of energy, whereas a Watt is a unit of a rate of
energy.
- Other units of energy include:
Unit Conversion
calorie (cal) 4.18 J
Calorie (Cal) 4180 J
British thermal unit (btu) 1055 J
1 ton of oil equivalent (Toe) 42 J
- A Sankey diagram is a good way to visualise energy transformations.
- Much more energy is produced than is used. This is due to losses caused by
inefficient processes.
- A countries energy flows can be represented as such:
