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TODAY IN HISTORY

    TREADMILL
    September 7, 1822 - New York City, U.S.A.

    A treadmill was completed to grind corn at the New York City Prison employing the labour of 8 to 16 prisoners at a time walking on what looked like a very wide, 5-ft diam. paddle wheel. Prisoners held on to a bar and climbed the paddle boards, like endlessly walking up stairs. On each revolution, a bell rang. This was the first of its kind in the U.S., but it was based on a penal idea that had been previously used successfully in Britain. When production began on 23 Sep 1822, it ground 40 to 50 bushels of corn per day. The project was suggested by Stephen Greelet and Isaac Collins, a manager of the Society for the Prevention of Pauperism, and adopted by the mayor. It was abandoned after a few years trial.

    ENGLAND BATTLE OF BRITAIN
    September 7, 1940 - UK, England

    The battle in the skies over England continues as Germany continues to send large numbers of Bombers laden with bombs targeting Liverpool, North East, North West, Bristol and London, and each night British fighters go out trying to stop the destruction to towns and cities around the country , during last nights raids some 40 + German bombers were downed by British fighter pilots. The Battle of Britain is the name given to efforts by the Luftwaffe during the Summer and Autumn of 1940 to gain air superiority over the RAF's Fighter Command which would have allowed the German planned amphibious and airborne landings in Britain of Operation Sealion to succeed.

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Electric Transformers :

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Do you want to know more about electric transformers? Every home and business is affected by transformers. Businesses use them to get the right power they need. Transformers are use in all high tech equipment. Do you want to know the different types?

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The role of electrical transformers is to switch voltage from one value to another; normally from higher to lower voltage or vice versa. They consist of two sets of coils or windings that are connected to a ferromagnetic core. There are two types of coils?the primary and secondary conductors.

A changing current in the primary conductor produces alternating magnetic fields in the core, which in turn multiples the fields and couples most of the flux with the secondary conductor. This incites the alternating voltage or EMF in each of the secondary conductor.

The cores can be customized as toroidal or laminated. The toroidal has several advantages such as producing low magnetic leakage, close flux path, low noise and smaller core size, lighter and more efficient. They have copper wires wrapped around a cylindrical core preventing leakage of magnetic flux. The magnetic flux is not very influential on other components.

On the other hand, the laminated core is composed of sheets of magnetic material that is insulated from one another with a non-conducting material such as varnish, producing a core that decreases electrical losses.

Electrical transformers can be configured in two ways. You can choose single-phase or three-phase. In switching the voltage level, the principle of magnetic induction between coils is to transfer voltage between coils from the electricity that flows through them. The transformers are passive devices that initiates the transformation of alternating current or AC electrical energy from one circuit into another through electromagnetic induction.

Many homes and businesses have transformers to transfer electricity from power plants. The voltage of the transformers at the power plants is normally high. As they reached the substation, the voltage is lowered. When they reached smaller transformer, the voltage is lowered again. The adjustment in voltage is a continuous process, which only stops when the power reaches the useable level.

The inward voltage of electrical transformers is very crucial. There are three general frequencies that are easy to obtain. These are the 50 Hertz, 60 hertz, and 400 hertz. If you are in Europe, the standard power is 50 hertz. In North America, the average power is 60 hertz. The 400 hertz is set aside for high-capacity purposes like aerospace technologies.

In estimating transformers, it is important to consider power specifications such as highest ratings of the next current, the secondary current ratings, highest power rating, the voltage rating, output type and output choices, such as AC or DC.

Transformers come in several types. There are power transformers, current transformers, step down transformers, low voltage transformers, distribution transformer, instrument transformers, general purpose transformers and automatic transformers.

The power transformers have several configurations based on segments and links. The distribution transformer decrease the primary voltage of the electric distribution system so that it can be used by customer. Auto electrical transformers are smaller in size, weigh less and have better voltage stability as well as overload tolerance.

The manner by which the electrical transformers function has changed. They made life easier for people as they transfer power efficient and more economical. The electricity that is available in your house passes through many different transformers before it is usable as a low voltage.

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