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Primary General Studies: Renewable Energy (Paper 4 (error clinic))
Primary General Studies: Renewable Energy (Paper 4 (error clinic))
Paper four drills the five kinds of item that lose the most marks: classifying sources, power and energy conversion, the cube law, efficiency and capacity factor.
Direct answers Write the units first, then the formula, then substitute the numbers, keeping units on the answer and checking with an estimate.
01 Paper details (check answers afterwards)
| Item | Detail |
|---|---|
| Questions | 10 |
| Suggested time | 20 |
| Difficulty mix | Foundation 3 · Intermediate 3 · Challenge 3 · Error redo 1 |
| Chapter | Chapter: Primary General Studies: Renewable Energy |
| Level | parts of a closed circuit, conductors against insulators, series against parallel, adding up battery voltage, and electrical safety |
02 Questions (10 items)
- FoundationOf solar, coal and wind, which one is non-renewable?
- FoundationA 200 W panel gets 4 hours of sun a day. What is its daily output?
- FoundationA 1.5 kW turbine runs for 8 hours. How much energy does it make?
- IntermediateWhat is the total rating of six 200 W panels in kW?
- IntermediateA home uses 250 kWh a month and 40 per cent is solar. How many kWh is that?
- IntermediateIf wind speed triples, by what factor does available power change?
- ChallengeSunlight is 800 W/m² and the panel is 20 per cent efficient. What is the output per square metre?
- ChallengeA 2.5 kW system gets 4 effective sun hours a day. What is the output over 30 days?
- ChallengeA wind farm has four 3 MW turbines at a 25 per cent capacity factor. What is the yearly output over 8 760 hours?
- Error redoA classmate answers that panels generate at night so no battery is needed. What is wrong?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | Coal. | Coal is a fossil fuel with finite reserves, and the test is whether nature replaces it quickly. |
| 2 | 0.8 kWh. | 200 times 4 is 800 Wh, which is 0.8 kWh. |
| 3 | 12 kWh. | 1.5 times 8 is 12 kWh. |
| 4 | 1.2 kW. | 200 times 6 is 1 200 W, that is 1.2 kW. |
| 5 | 100 kWh. | 250 times 0.4 is 100 kWh. |
| 6 | 27 times. | Power depends on the cube of wind speed, and 3 cubed is 27. |
| 7 | 160 W. | 800 times 0.2 is 160 W. |
| 8 | 300 kWh in total. | 2.5 times 4 times 30 is 300 kWh. |
| 9 | About 26.3 GWh. | Capacity 12 MW times 0.25 times 8 760 is 26 280 MWh, about 26.3 GWh. |
| 10 | Panels need sunlight, so night output is zero and storage or another source is essential. | This is the most common error, and a daily output curve shows the night is empty. |
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.
With all four done, go back to the chapter page and revise the three parts of a closed circuit plus three safety habits.Tutor Registration →
Questions and answers are written originally by the TutorZone team and are not taken from any school, publisher or examination authority paper. Every value is checked by computer.