Flashcards
3.1
Flashcards do conjunto (10)
- 1How do fossil fuels get to your home?Fossil fuels are extracted from underground or under the sea bed, and then transported to refineries or power stations. The power stations transfer electricity to your home.
- 2How are most of your energy demands met?Mostly, by burning fossil fuels (coal, oil, natural gas.) Nuclear power and biofuels are used, too.
- 3Why is so much fuel used to supply your energy?Energy is used and distributed inefficiently, and there is always some wasted as heat or sound.
- 4How does a power station work?In coal, oil, and most gas-fired power stations:
→ the burning fuel heats water in a boiler.
→ this produces steam
→ The steam turns a turbine which is connected to the electricity generator - 5What is a biofuel?A biofuel is a fuel taken from living or recently living organisms. For example: methane, ethanol, bio diesel, rapeseed, vegetable oil., nutshells, wood chip, straw, etc, etc.
- 6What are the advantages of biofuels?→ Renewable - used at the same rate as it is replaced
→ In theory, carbon neutral: because the carbon the living animal takes in from carbon dioxide can balance the amount made when the fuel is burnt. - 7What is nuclear fuel?Nuclear fuel takes energy from atoms. Energy is transferred from the nucleus of atoms.
- 8How does nuclear fuel work?? *Was not in test last time*→ The fuel is uranium/ plutonium, stored in sealed cans in the core of the reactor.
→The nucleus is very unstable and can split into two
→ Energy is transferred from the nucleus when this happens.
→ because there is a lot of atoms in the core, it becomes very hot . - 9How does nuclear energy work?? (continued)→ The energy of the core is transferred by a fluid called the coolant, which is very hot as it is pumped through the core.
→ it flows through a pipe to a heat exchanger and then back to the reactor core. The energy transferred is used to turn water into steam. - 10Advantages of nuclear energy.→ Nuclear energy is not renewable however it is very efficient and won't run out any time soon
→ no greenhouse gases though there is radioactive waste.
Informações
- Descrição
- Hard. Physics Y9 FlashCards sobre 3.1, criado por Aaishah Din em 06-07-2017.
- Criado por
- Aaishah Din
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