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Saturday, March 17, 2012

DO YOU KNOW THE HISTORY OF ELECTRICITY? Learn more here.





Who discovered electricity and when?

Electricity was not 'invented' : its characteristics and uses have been known about and developed over hundreds of years. Static electricity produced by rubbing objects against fur was known to the ancient Greeks, Phoenicians, Parthians and Mesopotamians. Greek philosophers discovered that when amber is rubbed against cloth, lightweight objects will stick to it. This is the basis of static electricity. When you touch something and get a shock, that is really static electricity moving through you.


Despite what you may have learned, Benjamin Franklin did not "invent" electricity. In fact, electricity did not begin when Benjamin Franklin flew his kite during a thunderstorm or when light bulbs were installed in houses all around the world.

The truth is that electricity has always been around because it naturally exists in the world. Lightning, for instance, is simply a flow of electrons between the ground and the clouds. Hence, electrical equipment like motors, light bulbs, and batteries aren't needed for electricity to exist. They are just creative inventions designed to harness and use electricity.


Over the centuries, there have been many discoveries made about electricity. We've all heard of famous people like Benjamin Franklin and Thomas Edison, but there have been many other inventors throughout history that were each a part in the development of electricity.


Electricity was discovered long before 1831. Chemical batteries have been around since ancient Greece. One of the earliest scientists to begin to quantify electric charges was the French physicist Charles-Augustin Coulomb (1736-1806). His law for measuring the magnitude of electric charge is still a cornerstone in modern physics. Ampere and Ohm defined current and resistance in direct current and Nikola Tesla invented the AC generator in the late 19th century.


Electricity wasn't invented : its properties were discovered, examined and explained.
  • Thales of Miletus in ancient Greece is one of the the earliest writers on experimentation with electrical properties. In 600 AD he wrote of static electricity that attracted pieces of straw and hair to rubbed rods of amber. (see related question below)
  • Benjamin Franklin proved that lightning was electrical in nature. He performed several experiments with the properties of the (known) force of electricity. While people have known about the powerful effects of lightning for thousands of years, the first person to discover that lightning was a naturally occurring form of electricity was Benjamin Franklin. In 1752, during a dangerous electrical storm, Franklin flew a kite that had a metal key at the bottom of the string. When a bolt of lightning hit the kite, a spark of electricity flew from the key! From this experiment, Franklin invented the lightning rod, which attracts lightning and draws it into the ground. This saves many buildings from burning down.
  • The first true electric battery was built in 1779. Alessandro Volta invented the first source of continuous electric current in his experiments with non-static electricity. He created a battery out of stacks of zinc and copper, with weak acids in between each layer.
                                 what is electricity
Electricity is a form of energy involving the flow of electrons. All matter is made up of atoms, and an atom has a center, called a nucleus. The nucleus contains positively charged particles called protons and uncharged particles called neutrons. The nucleus of an atom is surrounded by negatively charged particles called electrons. The negative charge of an electron is equal to the positive charge of a proton, and the number of electrons in an atom is usually equal to the number of protons. When the balancing force between protons and electrons is upset by an outside force, an atom may gain or lose an electron. When electrons are "lost" from an atom, the free movement of these electrons constitutes an electric current.
Electricity is a basic part of nature and it is one of our most widely used forms of energy. We get electricity, which is a secondary energy source, from the conversion of other sources of energy, like coal, natural gas, oil, nuclear power and other natural sources, which are called primary sources. Many cities and towns were built alongside waterfalls (a primary source of mechanical energy) that turned water wheels to perform work. Before electricity generation began slightly over 100 years ago, houses were lit with kerosene lamps, food was cooled in iceboxes, and rooms were warmed by wood-burning or coal-burning stoves. Beginning with Benjamin Franklin's experiment with a kite one stormy night in Philadelphia, the principles of electricity gradually became understood. In the mid-1800s, everyone's life changed with the invention of the electric light bulb. Prior to 1879, electricity had been used in arc lights for outdoor lighting. The lightbulb's invention used electricity to bring indoor lighting to our homes.

 
An electric generator (Long ago, a machine that generated electricity was named "dynamo" today's preferred term is "generator".) is a device for converting mechanical energy into electrical energy. The process is based on the relationship between magnetism and electricity. When a wire or any other electrically conductive material moves across a magnetic field, an electric current occurs in the wire. The large generators used by the electric utility industry have a stationary conductor. A magnet attached to the end of a rotating shaft is positioned inside a stationary conducting ring that is wrapped with a long, continuous piece of wire. When the magnet rotates, it induces a small electric current in each section of wire as it passes. Each section of wire constitutes a small, separate electric conductor. All the small currents of individual sections add up to one current of considerable size. This current is what is used for electric power. An electric utility power station uses either a turbine, engine, water wheel, or other similar machine to drive an electric generator or a device that converts mechanical or chemical energy to electricity. Steam turbines, internal-combustion engines, gas combustion turbines, water turbines, and wind turbines are the most common methods to generate electricity. Continue...How Electricity is Generated



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