AQA A-Level Environmental Science 3.3 Energy resources: a complete overview of fossil, nuclear and renewable energy

What module 3.3 actually demands

Energy resources is where AQA tests your ability to compare energy sources and weigh their trade-offs. Module 3.3 runs from the formation and impacts of fossil fuels, through nuclear power and its waste problem, the range of renewable resources, and the role of conservation and efficiency in cutting demand. The examiners reward clear comparisons, balanced evaluation, and accurate knowledge of how each resource works and what it costs the environment.

This guide walks through all four topics of the module, then sets out the exam patterns AQA repeats. Each topic has a matching dot-point page with practice questions; this overview ties them together.

Fossil fuels and nuclear power

Fossil fuels (coal from land plants, oil and gas from marine microorganisms) are energy-dense and convenient but finite, and burning them releases carbon dioxide, sulfur dioxide, nitrogen oxides and particulates. You must explain why they are non-renewable and list the impacts of both extraction and combustion.

Nuclear power uses the fission of uranium to heat water and drive turbines. It is low-carbon and reliable, but produces long-lived radioactive waste, carries an accident risk, and is costly to build and decommission. Balancing these is a classic exam question.

Renewables and demand reduction

Renewable energy resources (solar, wind, hydroelectric, tidal, wave, geothermal and biomass) are replenished naturally and low-carbon in operation, but most are limited by intermittency, the need for specific sites, high build costs, or habitat impacts. A reliable supply usually needs a mix plus storage.

Energy conservation and efficiency cut demand: conservation through behaviour, efficiency through insulation, efficient appliances, better transport and waste-heat recovery. Reducing demand is often the cheapest way to cut emissions.

How module 3.3 is examined

A typical AQA profile for Energy resources:

• Recall. How each resource generates energy and how fossil fuels and nuclear fuel form.
• Comparison and evaluation. Weighing advantages and disadvantages of resources for a given situation, including reliability, cost and environmental impact.
• Applied questions. Choosing or justifying an energy mix for a country or community.
• Extended answers. Discussing the trade-offs of nuclear power or the limitations of renewables.

Check your knowledge

A mix of recall and evaluation questions covering module 3.3. Attempt them under timed conditions, then check against the solutions.

1. Explain why fossil fuels are classed as non-renewable. (2 marks)
2. State two pollutants released by burning fossil fuels and a problem each causes. (2 marks)
3. Describe how nuclear fission is used to generate electricity. (3 marks)
4. Give one advantage and one disadvantage of nuclear power. (2 marks)
5. Explain why solar and wind power are described as intermittent. (2 marks)
6. Give one advantage and one disadvantage of hydroelectric power. (2 marks)
7. Explain the difference between energy conservation and energy efficiency. (2 marks)
8. State two ways of reducing energy demand in a home. (2 marks)