Inventions
In 1821, Michael Faraday invented the electric motor, without which we would not have many of the appliances we have today. In 1829, George Stephenson designed the‘ Rocket’, a steam train locomotive. It encouraged the growth of railways which played a big role in the Industrial Revolution. In 1837, Charles Babbage invented the‘ analytical engine’ which established the base of computing. Although he never made any of his machines, one was built and tested in 1991 and worked very well. In 1925, John Logie Baird produced the first TV set. It could be made out of everyday objects. He helped television develop as we know it today.
Inventor Vladimir Zworykin 1889-1982
Vladimir Zworykin was a physicist and an electrical engineer. He invented the cathoderay tube or the kinescope in 1929. The kinescope tube was an essential part for the transmission of television. Zworykin also invented the iconoscope in 1923. This was another type of tube for television transmission that was used in early television cameras.
Alternative sources of energy
The main sources of energy used to produce electricity in Russia are: coal 18 %, nuclear power 13 %, hydroelectric power 19 %, and gas 42 %. 64 % of electricity comes from fuels that are not renewable ― we must find alternative sources of energy ― alternative energy does not pollute ― solar cells can produce solar power ― wind can be converted into power using wind turbines ― water is a cheap alternative energy source. It is important for us to find alternative sources of energy. At the moment, the world gets 64 % of its electricity from fuels that are not renewable. This cannot continue as these fuels will not last forever. Alternative energy sources are the way forward as they do not create waste or pollution. Solar power is one source of alternative energy. It is produced by converting sun rays into energy using solar panels. Another clean source of energy is the wind. Large turbines with propellers can create large amounts of electricity easily. A cheap source of energy is hydroelectric power which is produced using water.
For-and-against essay Computers in Schools
Most people would agree that computers have made our lives much easier, especially in schools. However, some people feel that they can be a distraction in schools. Certainly, there are arguments for both sides.
There are many points in favour of computers in schools. Firstly, they improve students’ ICT skills. In fact, they are essential for this subject. Secondly, they can be used in music and language classes to great effect. For example, to mix music or to play a foreign language CD-ROM. Furthermore, the Internet is a very useful research tool for all subjects.
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