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Electricity            Today, human life has become more comfortable, advanced and developed because of many scientific inventions. Among them electricity is one of such inventions which is regarded to be one of the wonders of modern science. Electricity was invented by the American scientist; Edward Edison in 1878. The use of electricity first began in England.            Electricity is of two kinds: Static and Current. Static electricity cannot be transferred from one object to another and from one place to another. Current electricity can be transferred from one place to another by wishes. The electricity which we are using in current electricity.              Electricity is generated with the help of water. So it is called hydro-electricity. Electricity is also produced by coal, petroleum and other fuel. But t...

Telephone     The telephone is the means of communication. An American scientist Graham Bell invented in 1876. It is a very useful invention. It is no more an item of luxury. It has become a means of necessity. In cities and towns, people have telephone to talk to the people far away without going to them. Now the people in the villages also have telephones.       The telephone is operated by electricity. Wires connected different telephone sets. A telephone set has two parts- Receiver and transmitter. We speak with the help of transmitter and hear with the help of receiver. Every telephone has its number. In order to talk to a person, we have to dial the number. The person hears the call and holds the receivers. Then we can speak to him.        The telephone is the fastest means of communication. So, it is useful in many ways. It saves our times, labor and money. We can talk to a person for a simpler matter....