PHYSICS · Stage 8 · Chapter 9: Energy Resources
Physics 9.7 Chapter 9 Review: Energy Resources
5 min read 6 parts Lesson 7 of 7
Lesson summary
Physics 9.7 Chapter 9 Review: Energy Resources — Alhussan International Academy — Physics (Stages 7–9) notes: Summarise Chapter 9 on energy resources, power stations, electromagnetic induction and the advantages and disadvantages of each source.Primary — Coal, oil, gas, uranium, …
- Renewable and non-renewable
- Describing a graph
- Induced voltage
- No movement
- Renewable?
- Carbon dioxide
Section 1 of 6Primary and secondary sources
- Primary
- Coal, oil, gas, uranium, wind, water, Sun, geothermal and biomass.
- Secondary
- Electricity and fuels such as petrol and hydrogen, made from primary sources.
- Renewable and non-renewable
- Fossil fuels and uranium are non-renewable, whereas solar, wind, water, geothermal and biomass are renewable.
Section 2 of 6World energy use
- Trend
- Total energy consumption has risen steeply over two centuries.
- Biomass use has stayed roughly the same.
- Coal rose first, then oil and gas increased massively in the twentieth century, and nuclear power appeared later.
- Describing a graph
- Name the trend and quote values with units.
Section 3 of 6How a power station works
- The fuel provides thermal energy (burned fuel, nuclear fission, geothermal heat or hot biofuel).
- The heat turns water into steam.
- The steam drives a turbine.
- The turbine spins a generator.
- The generator produces electricity.
Section 4 of 6Electromagnetic induction
- Induced voltage
- Moving a magnet and a coil relative to each other induces a voltage.
- Direction
- Reversing the direction of movement reverses the voltage.
- Size
- The voltage increases with faster movement, a stronger magnet and more turns on the coil.
- No movement
- There is no induced voltage.
Section 5 of 6Comparing energy resources
| Source | Key features |
|---|---|
| Fossil fuels | Reliable, release carbon dioxide, non-renewable |
| Nuclear | No carbon dioxide while running, radioactive waste |
| Solar | No moving parts, depends on sunshine |
| Geothermal | Uses heat from the Earth |
| Hydroelectric | Reliable, floods land |
| Wind | No fuel, depends on wind |
| Wave and tidal | Renewable, expensive to build |
| Biofuel | Renewable, competes with food crops |
Section 6 of 6Judging a resource
- Renewable?
- Can it be replaced?
- Carbon dioxide
- Does it release carbon dioxide?
- Supply
- Can it supply electricity when needed?
- Costs and effects
- What are the building costs and environmental effects?
- Units
- Voltage is in volts, energy in joules or kilowatt-hours, and efficiency as a percentage.
Last updated: