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Science Project

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Michelle Ma

on 24 May 2016

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Transcript of Science Project

Renewable and Nonrenewable energy: Wind and Coal
Original Source
Coal originally came from fossil fuels that were formed from plants millions of years ago. The fossil fuel’s energy comes from sunlight because the plants use the sun’s energy for photosynthesis. These stored energy in animals and plants are buried under many layers of rocks, and are under pressure. This pressure creates a chemical reaction which heats it up and making it fossil fuel.

How can this energy source be managed so we don't run out of the resource?

Because fossil fuels take millions of years to develop, coal will eventually run out. The only way it manage coal energy so it wouldn’t run out is to just simply use less of it. However, the amount we consume is a lot more than the amount it could be produced, therefore it is unsustainable.

Advantages and Disadvantages
1. Once the wind turbine is built the energy it produces does not cause green house gases or other pollutants.
2. Although wind turbines can be very tall each takes up only a small plot of land, the land below can still be used.
3. Some areas that are not connected to the electricity power grid can use wind turbines to produce their own supply.

Renewable source: Wind
Steps to how it produces electricity:

1. Milled into fine powder so it increases the surface area and allows it to burn more quickly
2. Combustion: in a boiler where it is burnt at high temperature and the hot gases and heat energy produce converts water into steam
3. The steam pushes the blades and the turbine shafts rotate at high speed
4. Electricity is generated when the shafts are turned and rotated in a strong magnetic field
5. After the steam passes through the turbine, it goes back to the boiler and heats again

Steps to how it produces electricity:
Advantages and Disadvantages
1. A wind turbine with propellers is used to convert the kinetic energy (wind) to electricity.
2. As the wind passes the turbines, it moves the blades.
3. The shaft of the turbine is connected to a generator that uses the rotation of the blades to rotate a rotor.
4. The rotor, which has oppositely charged magnets and is surrounded by copper wires looped around it, creates electromagnetic induction.
5. As the rotor spins, it generates electricity.

1. The strength of the wind is not constant and it varies from zero to storm force, they do not produce the same amount of electricity all the time. There will be times when they produce no energy at all.
2. Wind turbines are noisy, one can generate the same level of noise as a family car travelling at 70mph.
3. The largest single wind turbine available today can only provide enough electricity for 475 homes.

1. Coal energy is inexpensive because of coal’s stable price compared to other fuel sources
2. It produces high amounts of energy because of combustion
3. The coal can be easily transported to other countries
1. Causes global warming because it produces high amounts of carbon dioxide during combustion
2. May not be sustainable when it is consumed too much and too often
3. Coal mining is a dangerous and puts people’s lives in danger. Coal mining can also cause destruction in the environment


Is this technology widely accepted/used today? Why or why not?

Is this technology widely accepted/used today? Why or why not?
In the past, people used windmills to generate electricity in farms and many other places. Nowadays, more people are starting to use this technology as it is fast and clean, also being free. It also protects the earth by being environmentally friendly, and is also quite efficient. Since it is also a renewable energy source, it will never run out, proving as a solution to the increasing demand for electricity in our world.

Nowadays, coal is used greatly in many countries for electricity. In the US, 56% of electricity used is generated by coal. It is used as there is a large source of coal, and the process is quite efficient. People use different types of coal energy for different things. For example, we use coking coal for steel production and steam coal to generate power. Coal technology is advancing, therefore increasing the efficiency of it. This technology is widely accepted today because it is more abundant and cost effective compared to other resources (oil, natural gas).

Wind is caused by the rotation of earth and the uneven heating of the atmosphere by the sun. The origin of wind is the temperature of air at different parts of the earth caused by the sun.
Original source
How can this energy source be managed so we don't run out of the resource?
Since wind is created by the sun's uneven heating, as a part of how nature works, wind energy will never run out. This is because in order to generate energy using wind, only a wind turbine and wind is needed.
Nonrenewable source: Coal
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