What is renewable energy?
Renewable energy comes from sources that do not run out and can be used again and again, such as the Sun (solar), wind, flowing water and biomass. It is cleaner than burning fuel and helps protect the environment. Engineers use renewable energy to power many products.
Key idea
Renewable energy can be replaced naturally and will not run out, unlike petrol or coal.
Designing a product
To design a product that uses renewable energy, follow the design process: identify the problem, gather ideas, sketch a design, make a model, then test and improve it. Think about the energy source, the parts needed and how the user will use it safely.
- Solar — a small solar panel can charge a light or a fan.
- Wind — a mini wind turbine can spin to make electricity.
- Water — flowing water can turn a wheel.
Why it matters
Products powered by renewable energy save fuel, cause less pollution and can work where there are no power lines. A good design is safe, useful and easy to use.
Example
Wira designs a solar garden lamp: a solar panel charges a battery in the day, and the light turns on at night.