Guided lesson: Energy Resources

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Physics

2.Wind and water generation

4.18P

Wind and stored water both end up spinning the same machinery, but they bank their energy differently: wind carries its energy as motion, while a dammed reservoir holds it in height and releases it on demand.

1-8-wind-farms_edexcel-al-physics-rn — Wind turns the turbines directly, which turn generators, which generate electricity

1-8-3-hydroelectric-dam-cie-igcse-23-rn — A hydroelectric dam transfers energy from the gravitational potential energy store of the water to its kinetic energy store mechanically to turn a turbine

Key points

Wind turns turbines directly, and the turbines turn generators to generate electricity.
The energy chain for wind runs from the wind's kinetic store through the turbine's to the generator's.
Hydroelectric schemes hold water at height in a dam and release it to turn the turbines.
The energy chain for hydroelectric power starts in the water's gravitational potential store.

First pass

A wind farm borrows the moving air's motion; a hydroelectric dam cashes in height. Both hand the spin to a generator, but only the dam can choose the moment — open the sluice when the Grid asks.

Analogy — A wind farm is paid on delivery; a dam is a savings account — deposit the water, withdraw the spin exactly when needed.

Exam pointer — When tracing transfers for either resource, name each store in order — wind: kinetic to kinetic to kinetic; hydroelectric: gravitational to kinetic to kinetic to kinetic.

Going deeper

Wind generation transfers energy from the kinetic store of the moving air into the turbine and then the generator, all kinetic. Hydroelectric generation instead opens with a gravitational potential store: released water gains kinetic energy as it falls, then drives turbine and generator through the same mechanical chain.

Analogy — Spending a wage as it arrives (wind) versus drawing on a savings account (dam): the shopping (generation) is identical, the opening balance differs.

Exam pointer — Do not give hydroelectric water a thermal store — nothing is heated; the fall converts height energy into motion energy.

Checks

0 of 9 attempted · 0 correct

1.What turns the turbines in a wind farm?
2.Where does the energy chain begin in a hydroelectric station?
3.Which sequence correctly traces the wind generation chain?
4.What advantage does a hydroelectric dam have over a wind farm in matching supply to demand?
5.In a hydroelectric dam, what happens to the water's energy as it falls towards the turbines?
6.State which store the energy chain starts from for wind generation.
Written response · recall
Your answer
7.State where hydroelectric schemes store their water before it is released.
Written response · recall
Your answer
8.Explain why the hydroelectric energy chain contains one more store than the wind chain.
Written response · explain why
Your answer
9.A tidal barrage is another water-based scheme. Describe how its generation chain parallels the hydroelectric one.
Written response · application
Your answer

3.Geothermal and solar

4.18P

Underground heat and overhead light are the quiet resources: hot rocks boil water into steam for the turbines, while solar cells skip the spinning entirely and turn sunlight straight into electricity.

1-8-4-geothermal-energy-cie-igcse-23-rn — Cold water is heated by the rocks and returned as hot water or steam which can be used to turn turbines to generate electricity

1-8-1-solar-cells-cie-igcse-23-rn — Solar cells use energy from the sun to generate electricity directly

Key points

Geothermal plants pump water down to hot rocks and bring back steam that turns turbines.
The geothermal chain runs from the thermal store of the rocks through the water's thermal store to the kinetic stores of turbine and generator.
Solar cells convert sunlight directly into electricity with no turbine at any stage.
Solar heating panels are the related but separate technology that warms household water instead of generating.

First pass

One resource borrows a furnace already running beneath our feet; the other harvests the light itself. Hot rocks make steam for the old spinning route; cells make electricity the direct way.

Analogy — Geothermal is a central-heating boiler wired to the Grid; solar cells are the leaf on the tree — no machinery between light and electricity.

Exam pointer — Keep the two solar technologies apart in answers: cells generate electricity, panels heat water — mixing them is a classic lost mark.

Going deeper

Geothermal generation opens in the thermal store of underground hot rocks, which heat pumped water into steam whose kinetic store then drives turbine and generator. Solar cells instead convert the Sun's energy directly into electricity, the only named resource with no turbine stage, while solar heating panels deliver warmth to water rather than generation.

Analogy — A kitchen with two appliances: a kettle (geothermal — heat makes steam that spins) and a solar-powered calculator (cells — light becomes electricity with nothing spinning).

Exam pointer — Trace the geothermal chain store by store — rocks (thermal), water (thermal), turbine (kinetic), generator (kinetic) — and state the cells' no-turbine exception explicitly.

Checks

0 of 9 attempted · 0 correct

1.What heats the water in a geothermal power station?
2.Which store does the geothermal energy chain start from?
3.What is special about solar cells among the resources in these lessons?
4.Which statement about solar heating panels is correct?
5.In which order does energy pass through stores in a geothermal station?
6.State what turns the turbines in a geothermal power station.
Written response · recall
Your answer
7.State what solar cells use as their energy input.
Written response · recall
Your answer
8.Explain why the geothermal chain passes through two thermal stores before reaching a kinetic one.
Written response · explain why
Your answer
9.A school uses solar cells on its roof and a geothermal borehole in its grounds. State one difference in how the two deliver energy to the school.
Written response · application
Your answer