Summary
Energy comes from various sources, including renewable and non-renewable resources. The Sun is our main source of energy, providing both light and heat. Renewable energy sources, like wind, running water, and solar energy, do not run out easily, while non-renewable energy sources, such as fossil fuels, can deplete quickly.
- Renewable Energy — energy sources that do not run out easily. Example: wind, solar energy, running water
- Non-renewable Energy — energy sources that can run out quickly. Example: natural gas, coal, crude oil
- Solar Energy — energy from the Sun used for light and heat. Example: solar panels converting sunlight to electricity
- Wind Energy — energy from wind used in windmills and turbines. Example: wind turbines converting wind to electrical energy
- Hydroelectric Energy — energy from running water used in power stations. Example: dams converting water flow to electricity
- Fossil Fuels — fuels like coal and oil that store chemical energy. Example: burning coal to produce electricity
Exam Tips
Key Definitions to Remember
- Renewable Energy: Energy sources that do not run out easily.
- Non-renewable Energy: Energy sources that can run out quickly.
- Solar Energy: Energy from the Sun used for light and heat.
Common Confusions
- Confusing renewable with non-renewable energy sources.
- Misunderstanding the role of the Sun in the energy cycle.
Typical Exam Questions
- What is a renewable energy source? Answer: Energy sources that do not run out easily, like wind or solar energy.
- How does a solar panel work? Answer: It converts light energy from the Sun into electrical energy.
- Why is the Sun considered our main source of energy? Answer: It provides light and heat, essential for life and various energy conversions.
What Examiners Usually Test
- Understanding the difference between renewable and non-renewable energy.
- The role of the Sun in providing energy.
- Examples of energy conversions in different sources.