Science Revision

2. Earth's natural satellite, which only shines because it reflects light from another source
4. The "fuel" or energy required for any appliance or system to function
7. A term you would not use for a machine if its wasted output is more than its useful output
10. The useful energy output from a torch or a car's headlights
11. The ultimate energy source that a plant uses to create its own food
12. The chemical energy input used by the car in the scenario
13. The process an energy chain demonstrates, showing how energy moves between objects
18. The Earth's 24-hour spin that is directly responsible for causing day and night

1. The imaginary line that the Earth spins on, causing day and night
3. The result of an energy transfer, which can be either useful or wasted
5. The kind of stored energy found in petrol, a battery, or a stretched elastic band
6. The period of time it takes for the Earth to complete one full revolution around the Sun
8. The term for the predictable cycle of the Moon's appearance from Earth
9. Describes the heat from a car's engine because it doesn't contribute to the car's main purpose
14. What the Moon does with sunlight, which is why we can see it
15. The type of energy being used by a moving car, or the energy input required to play a drum
16. The specific form of useful energy output from the car's radio
17. The year-long journey the Earth takes around the Sun