3.1 Transformation of Energy

• Forms of energy in the environment
• Transformation of energy from one form to another
• Energy transformation in devices used at home and in school
• The law of conservation of energy
• Importance of energy transformation in day to day life

• identify forms of energy in the environment
• describe the transformation of energy from one form to another
• explain the law of conservation of energy
• construct a simple device that demonstrates transformation of energy
• appreciate the importance of energy transformation in day to day life

“How is energy transformed from one form to another?”

The titles are open to everyone. Reading a lesson needs an account — sign in or create one.

1. What energy is
   40 min · 1 practice tasks · quiz
   Why nothing happens without energy, what a joule is, and how big everyday amounts are.
2. Forms of energy
   40 min · 1 practice tasks · quiz
   The eight forms to know, with an everyday example of each.
3. Kinetic and potential energy
   40 min · 1 practice tasks · quiz
   Movement energy, stored energy, and how one becomes the other as something falls.
4. Chemical energy
   40 min · 1 practice tasks · quiz
   The store inside food, fuel and dry cells, and how each one releases it.
5. Heat and light energy
   40 min · 1 practice tasks · quiz
   Two forms that spread outwards, how they differ, and why almost all of ours comes from the sun.
6. Sound and electrical energy
   40 min · 1 practice tasks · quiz
   Why sound needs a material to travel through, and why electricity needs a complete circuit.
7. What energy transformation means
   40 min · 1 practice tasks · quiz
   Energy in, energy out, and why some of what comes out is always wasted.
8. Energy in a torch
   40 min · 1 practice tasks · quiz
   Following the energy from the dry cells to the beam, and finding the waste.
9. Energy in an electric motor
   40 min · 1 practice tasks · quiz
   Electricity in, movement out, and the heat and sound that come with it.
10. Energy in a generator
    40 min · 1 practice tasks · quiz
    The device that runs a motor backwards: movement in, electricity out.
11. Energy from the sun
    40 min · 1 practice tasks · quiz
    Two ways of catching sunlight: a panel that makes electricity and a heater that makes hot water.
12. Energy transformation chains
    40 min · 1 practice tasks · quiz
    Following energy through several forms in a row, using a hydroelectric station as the example.
13. Energy in living things
    40 min · 1 practice tasks · quiz
    From sunlight to a plant, from food to movement, and where the heat comes from.
14. The law of conservation of energy
    40 min · 1 practice tasks · quiz
    The rule that energy cannot be created or destroyed, and how to check it with numbers.
15. Useful and wasted energy
    40 min · 1 practice tasks · quiz
    Comparing devices by how much of their energy actually does the job.
16. Showing energy on a diagram
    40 min · 1 practice tasks · quiz
    Drawing a Sankey diagram, where arrow width shows how much energy goes each way.
17. Building an energy device
    40 min · 1 practice tasks · quiz
    Making a rubber band car or a pinwheel lifter from scrap, and explaining what it shows.
18. Energy transformations at home
    40 min · 1 practice tasks · quiz
    Naming the input, useful output and waste for six devices found in any household.
19. Using energy carefully
    40 min · 1 practice tasks · quiz
    Six habits that cut waste at home, and why saving energy is not the same as the conservation law.
20. Where Kenya gets its energy
    40 min · 1 practice tasks · quiz
    The five main sources, what turns the generators, and why efficient stoves matter so much.