--- title: Fuels, the Sun and saving energy — a lesson of Mova's school · trees and pragmatics description: «Fuels, the Sun and saving energy», a lesson of the physics course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: A log on a campfire holds energy the tree caught from sunlight; burning joins the wood with oxygen from the air and lets that energy out --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/physics/32-fuels-the-sun-and-saving-energy/) [home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [school](https://md.mova.elamur.ai/free/en/corpora/school/) / [Physics](https://md.mova.elamur.ai/free/en/corpora/school/physics/) / Fuels, the Sun and saving energy # Fuels, the Sun and saving energy Lesson 32 of the physics course of Mova's primary school: 18 sentences, each with its syntax tree and pragmatics. The lessons are written for Mova, and their agreed trees are part of Mova corpus 0.4 (CC BY-SA 4.0). How Mova does on its tests: [the lesson at school](https://md.mova.elamur.ai/free/en/school-run/physics/32-fuels-the-sun-and-saving-energy/). - [0](https://md.mova.elamur.ai/free/en/corpora/school/physics/32-fuels-the-sun-and-saving-energy/0/) — A log on a campfire holds energy the tree caught from sunlight; burning joins the wood with oxygen from the air and lets that energy out as heat and light. - [1](https://md.mova.elamur.ai/free/en/corpora/school/physics/32-fuels-the-sun-and-saving-energy/1/) — A fire needs three things, fuel, oxygen and heat, and taking away any one puts it out, which is how a fire blanket works: it keeps the oxygen away. - [2](https://md.mova.elamur.ai/free/en/corpora/school/physics/32-fuels-the-sun-and-saving-energy/2/) — Coal, oil and gas power stations burn fuel to boil water into steam that spins turbines, but these fossil fuels took millions of years to form, will run out, and put carbon dioxide into the air, which warms the planet. - [3](https://md.mova.elamur.ai/free/en/corpora/school/physics/32-fuels-the-sun-and-saving-energy/3/) — Wind, sunshine and flowing water keep coming back, so they are called renewable, and the cleanest energy of all is the energy you do not waste: lights off, LED bulbs on. - [4](https://md.mova.elamur.ai/free/en/corpora/school/physics/32-fuels-the-sun-and-saving-energy/4/) — Energy also hides in height: a sledge at the top of a hill whizzes down with no push, paid for by the hard walk up. - [5](https://md.mova.elamur.ai/free/en/corpora/school/physics/32-fuels-the-sun-and-saving-energy/5/) — Burning joins a fuel with oxygen from the air and releases its stored energy as heat and light. - [6](https://md.mova.elamur.ai/free/en/corpora/school/physics/32-fuels-the-sun-and-saving-energy/6/) — A fire needs fuel, oxygen and heat; take one away and it goes out, and a fire blanket works by keeping the oxygen out. - [7](https://md.mova.elamur.ai/free/en/corpora/school/physics/32-fuels-the-sun-and-saving-energy/7/) — Coal, oil and gas power stations burn fuel to heat water into steam, and the steam spins turbines that make electricity. - [8](https://md.mova.elamur.ai/free/en/corpora/school/physics/32-fuels-the-sun-and-saving-energy/8/) — Burning fossil fuels puts carbon dioxide into the air, which warms the planet. - [9](https://md.mova.elamur.ai/free/en/corpora/school/physics/32-fuels-the-sun-and-saving-energy/9/) — Fossil fuels took millions of years to form and are being used much faster, so one day they will run out. - [10](https://md.mova.elamur.ai/free/en/corpora/school/physics/32-fuels-the-sun-and-saving-energy/10/) — Wind, sunshine and flowing water keep coming back, so they are called renewable. - [11](https://md.mova.elamur.ai/free/en/corpora/school/physics/32-fuels-the-sun-and-saving-energy/11/) — A bike dynamo spins a magnet in a coil and turns the movement of the wheel into electricity for the lamp; the faster the wheel spins, the more it makes. - [12](https://md.mova.elamur.ai/free/en/corpora/school/physics/32-fuels-the-sun-and-saving-energy/12/) — A falling object turns the energy of its height into speed, so a glass dropped from higher up hits harder. - [13](https://md.mova.elamur.ai/free/en/corpora/school/physics/32-fuels-the-sun-and-saving-energy/13/) — An LED bulb gives the same light as an old bulb for a fraction of the electricity. - [14](https://md.mova.elamur.ai/free/en/corpora/school/physics/32-fuels-the-sun-and-saving-energy/14/) — A petrol engine wastes much of its fuel as heat, which is why a car needs a radiator; electric motors waste much less. - [15](https://md.mova.elamur.ai/free/en/corpora/school/physics/32-fuels-the-sun-and-saving-energy/15/) — Plants grow towards light because their leaves need it to make food, storing the energy as sugar. - [16](https://md.mova.elamur.ai/free/en/corpora/school/physics/32-fuels-the-sun-and-saving-energy/16/) — The Sun shines because tiny parts of hydrogen join together deep inside it, a process called fusion, and it will keep shining for about another five billion years. - [17](https://md.mova.elamur.ai/free/en/corpora/school/physics/32-fuels-the-sun-and-saving-energy/17/) — Walking or riding up a hill stores energy that turns back into speed on the way down. - ← previous: [Energy: what makes things happen](https://md.mova.elamur.ai/free/en/corpora/school/physics/31-energy-what-makes-things-happen/) - next →: [Levers: lifting heavy things with a little push](https://md.mova.elamur.ai/free/en/corpora/school/physics/33-levers-lifting-heavy-things-with-a-little-push/) - ↑ back to [Physics](https://md.mova.elamur.ai/free/en/corpora/school/physics/)