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Physics

Transformers

Voltage transformers, commonly called transformers, are devices capable of increasing or reducing voltage values. A transformer consists of a core made of a highly magnetizable material and two coils with different number of turns isolated from each other, called primary (coil that receives the mains voltage) and secondary (coil where the transformed voltage comes out).
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Chemistry

Molar Fraction (x)

The molar fraction is a unit of concentration widely used in physical chemistry. The value of the molar fraction of the solute as well as the solvent can be found. It is a dimensionless unit. or or Then: Where: x = solution molar fraction x 1 = solute molar fraction x 2 = solvent molar fraction n 1 = solute mol n ° 2 = solvent mol n ° n = mol n ° Note: Adding 52.0g of sucrose, C 12 H 22 O 11, to 48.0g of water to form a solution, calculate the molar fraction of sucrose in this solution: To find the molar fraction of the solute ( sucrose):
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Physics

Thermodynamic Formulas

Thermodynamics is an area of ​​physics that studies energy transfers. Here's a list of formulas about this content. Internal energy Internal energy Variation of internal energy Working of a gas Working of a gas Working of a gas under constant pressure Working of a gas at constant temperature Working a gas at constant volume Working a gas in an adiabatic transformation Laws of Thermodynamics Law 1 Thermodynamics 2nd Law of Thermodynamics "Heat cannot flow spontaneously from a lower temperature body to another higher temperature body.
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Chemistry

Chemical Kinetics (continued)

Activate Energy (Eat) This is the minimum energy that reagents need to initiate the chemical reaction. This minimum energy is required for the formation of the activated complex. The higher the activation energy, the slower the reaction, because it increases the difficulty for the process to occur. The lower the activation energy, the lower the energy "barrier", the more effective collisions and therefore a faster reaction.
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Chemistry

Chadwick

James Chadwick was a physicist, born October 20, 1891 in England. He was the one who discovered the null particle of atoms, the neutrons. He began his research on radioactivity at the University of Manchester in 1908. Ernest Rutherford was his supervisor. In 1913, he won a scholarship to work in Germany and work with Hans Geiser.
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Physics

How do 3D cinemas work?

Since its inception, cinema has evolved a lot, gaining sound, colors and special effects. The latest news is 3D movies, which need special glasses like the ones below to watch. In 3D movies, scenarios, people, and even cartoon characters can be viewed three-dimensionally, as if they were real and closer to us.
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