OCR · Design and Technology · J310
GCSE Design and Technology: How do designers choose appropriate sources of energy to make products and power systems?
Implications of wider issues · OCR GCSE Design and Technology (J310), specification point 3.2. Cards are generated from the exam board's own specification for "How do designers choose appropriate sources of energy to make products and power systems?", and every card links back to the page it came from. Specification © OCR — used with attribution.
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Why are fossil fuels classed as non-renewable energy sources?
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They took millions of years to form and are being used up far faster than nature can replace them.
Name the three main fossil fuels.
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Coal, oil and natural gas.
What fuel is used in a nuclear power station?
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Uranium — its nuclei split (fission), releasing heat that makes steam to drive turbines.
Is nuclear fuel renewable or non-renewable?
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Non-renewable — uranium is a finite mineral that has to be mined.
What is a bio-fuel made from?
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Recently living organic matter such as plant crops or animal waste (e.g. bioethanol from sugar cane, biodiesel from vegetable oil).
Why is bio-fuel classed as a renewable energy source?
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The crops or organic matter it is made from can be regrown within a short time.
How does a wind turbine generate electricity?
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Moving air turns the blades, which spin a generator to produce electricity.
How does a hydro-electric power station generate electricity?
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Water stored behind a dam is released to flow through turbines, which spin generators.
What advantage does tidal power have over wind and solar power?
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Tides are predictable, so its output can be reliably forecast — wind and sunshine are intermittent.
What device converts sunlight directly into electricity?
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A solar (photovoltaic) cell.
What energy transfer takes place in a generator?
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Kinetic energy of the spinning turbine is transferred to electrical energy.
A battery stores energy as ? energy.
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chemical
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