End Of Unit Questions Flashcards
Why do hydroelectric power stations have to be built in hilly areas?
The water must fall from a height to transfer gravitational potential to kinetic energy
Give three situations in which energy can be obtained from water to produce electricity
Energy can be obtained from falling water, waves and tides
What is a fossil fuel?
A fuel that is obtained from long dead biological materials
Where does geothermal energy come from?
Heat in rocks deep below the earths surface
Give two examples of where solar energy is particularly useful for producing electricity
- portable devices that only require a little bit of energy
* sunny places that are not connected to a grid system
Why is a solar cell?
A device that produces electricity directly from energy from the sun
What is a solar heating panel?
A device that heats water using energy from the sun
Are renewable or non renewable energy sources the most reliable?
Non renewable
What are the disadvantages of using fossil fuels in power stations to produce electricity?
They emit co2 that can cause global warming and so2 that can cause acid rain
What colour are the pipes in a solar heating panel usually painted?
The pipes are usually painted black
State three advantages of geothermal energy
- renewable
- free
- doesn’t produce polluting gases
Give three examples of biofuels
- methanol from waste
- ethanol from fermented sugar cane
- nutshells
