- Chemical energy (e.g. fuel for cars, electricity for appliances)
- Light energy (e.g. from the sun, from light bulbs)
- Mechanical energy (e.g. from machines, from car engines)
- Heat energy (e.g. from burning fuel, from the sun)
- Electrical energy (e.g. from power plants, from batteries)
- Sound energy (e.g. from music, from voices)
- Nuclear energy (e.g. from nuclear power plants)
- Radiant energy (e.g. from the sun, from infrared radiation)