How does paper 2 differ from paper 1?

Paper 2 demands comparison and calculation, so answers must state the reasoning rather than the conclusion alone.

Where do unit errors usually come from?

Most often MW is mixed with MWh, or annual with daily figures; unify units before writing the equation.

S6 Geography | Energy Resource Management Practice Paper 2 (Advanced)

2026-11-03

Move into comparison and calculation: energy mix, self-sufficiency, time-of-use tariffs, plus four calculations on hydro, wind, per-capita use and power density.

Attempt first, mark afterwards　Allow about thirty minutes; show units and substituted numbers in calculation items or method marks are lost.

01　Paper details (check answers afterwards)

Item	Detail
Questions	10 items
Suggested time	About 30 minutes
Difficulty mix	Foundation 3 · Intermediate 3 · Challenge 3 · Error redo 1
Chapter	Chapter: S6 Geography \| Energy Resource Management
Level	S6 (Secondary 6) Geography

02　Questions (10 items)

FoundationWhat does a region energy mix mean?
FoundationWhy do most places not aim for full energy self-sufficiency?
FoundationWhat is the most common economic tool of demand-side management?
IntermediateA reservoir has a 100 m head, 20 cubic metres per second and 0.85 efficiency. What is the output?
IntermediateBiomass is often called carbon neutral. What is the precondition?
IntermediateWhere is geothermal power best suited?
ChallengeA city uses 45 TWh a year with a population of 7.5 million. What is consumption per person?
ChallengeA 3 MW turbine runs at a 35 per cent capacity factor. What is its annual output?
ChallengeA 50 MW solar farm occupies 100 hectares. What is its average power density in watts per square metre?
Error redoWhy is the claim that renewable electricity costs nothing because fuel is free wrong?

03　Answers and one-line notes

#	Answer	One-line note
1	The share each primary energy source takes in a region	The mix sets both carbon intensity and import dependence, so it is a core policy indicator.
2	Resource endowment and cost: importing is often cheaper under comparative advantage	Raising self-sufficiency usually means a higher unit price, so most places accept a tolerable risk instead.
3	Time-of-use tariffs, dearer at peak and cheaper off-peak	Prices shift deferrable demand away from the peak, so less plant is built for a few peak hours.
4	About 16.7 MW	Power is density times gravity times flow times head times efficiency: 1 000 times 9.81 times 20 times 100 times 0.85.
5	The carbon released equals what the plants absorbed, and replanting must actually happen	If the fuel comes from deforestation or long transport, the carbon debt may last decades.
6	Plate boundaries or areas with recent volcanic activity	Heat flow is high there so shallow wells yield enough steam; stable regions cost far more.
7	6 000 kWh	45 billion divided by 7.5 million equals 6 000, mid-range for a high-income city.
8	About 9 198 MWh	3 MW times 8 760 hours times 0.35 is about 9 198 MWh, roughly 9.2 GWh.
9	50 W/m²	50 000 kW over 1 000 000 square metres is 0.05 kW per square metre, far below urban demand density.
10	It ignores capital, land, grid connection and backup capacity costs	Free fuel does not mean a low unit cost, and intermittency adds storage or standby plant.

04　What to do after marking

After marking, redo only the wrong items and write down which step went wrong (formula, unit, or misread number).
Repeat the same item two days later; move to the next paper only when both attempts are correct.
Parents only need the answer and note columns; there is no need to explain every item.

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