All articles
- How to know the voltage
Because of the compact design, high luminosity, technologically advanced performance and low power consumption, LEDs today are widely used as light emitting elements. One of the features of semiconductor devices of this type is a very narrow range of supply voltages. Typically, the operating characteristics of the electronic components are provided by the manufacturer in the accompanying documents. But what if its not? How to find voltage led independently? - How to solve problems with fractions
To solve the problem with fractions, you need to learn how to do arithmetic. They can be decimal, but most often uses natural fraction with the numerator and denominator. Only after that you can go to to solve math problems with fractional quantities. - How to find the centripetal acceleration
Centripetal acceleration appears when a body moves in a circle. It is directed to its center, measured in m/S2. A feature of this type of acceleration is that it is, even when the body is moving with constant speed. It depends on the radius of the circle and the linear velocity of the body. - How to determine methyl alcohol
Methyl alcohol – a compound belonging to the group of Monohydric alcohols. Methanol is highly toxic, only 10 ml of this substance can cause severe Central nervous system damage, blindness, and 30 ml is death. Hence the need of identifying it. Much easier analysis of methyl alcohol to carry out in the Toxicological laboratory, but it is possible to make the simplest definition even at home. - How to find cubic meter
When solving problems related to measurement of volume, usually used a standard unit of measurement of this quantity is the cubic meter. In cubic yards, I think the volume (cubic capacity) of premises, consumption of water and gas, the amount of certain materials. Since a cubic meter is the standard international physical unit (SI) of measurement of volume, usually translated and other non-si units (liters, cubic centimeters and cubic decimeters) - How to find the area of a trapezoid if you know the diagonal
A trapezoid is a quadrilateral with two sides to each other parallel. The main formula area of a trapezoid is the product of the half-sum of the bases on height. In some geometric problems on finding the area of a trapezoid use a basic formula is impossible, but the lengths of the diagonals. How to be? - How to calculate the radius of the circle
Ancient geometry based on multiple mathematical operations with a circle, circumference and diameter was derived universal PI. PI is ratio of circle's circumference to its radius with a numeric value of approximately 3.14. - How to find the price of division of the device
If measurements are made with instruments with digital display, readings can be removed without any problems. If the measuring devices applied scale, in order to accurately measure value, it is necessary to know the price of division of the device. Sometimes it is indicated on the scale, if it is not, calculate it yourself. - How to find least common divisor
Addition and subtraction of natural fractions only when they have the same denominator. In order to simplify the calculations when casting their common denominator, find lowest common divisor of the denominators and calculate. - How to obtain copper hydroxide
Copper hydroxide (II) – the substance is bright blue, not soluble in water. Has a crystalline or amorphous structure. It is a weak base used in the processing of agricultural plants, in textile and chemical industries. Cu(OH)co₂ get action on copper salts strong bases (alkalis). - How to find the length of the hypotenuse in a right triangle
Call the hypotenuse the longest side in a right triangle, therefore, not surprising that in the Greek language this word is translated as "stretched". This side is always opposite the angle to 90° and the sides that form the angle are called the legs. Knowing the lengths of these sides and the magnitude of the acute angles in different combinations of these values, we can calculate the length of the hypotenuse. - How to calculate the perimeter
The perimeter describes the length of the closed path. Like square, it can be found on other values given in the problem statement. Tasks on finding the perimeter very often in the school course of mathematics. - How to calculate the diagonal of the rectangle
Rectangle is one of the simplest of geometric shapes, which, having all the angles equal to 90°, is a special case of a parallelogram. The segment connecting two vertices of a rectangle having a common side is called a diagonal of this polygon. To calculate the length of the diagonal in several ways depending on the known source data. - How to find the point of intersection of the circles
Geometric problem, which is solved analytically using the methods of algebra are an integral part of school curricula. In addition to the logical and spatial thinking, they develop an understanding of key relationships between the entities of the world and the abstractions used by people to formalize relations between them. Finding points of intersection of simple geometric shapes is one of the types of similar tasks. - How to determine the polarity of the diode
Any diode changes its conductivity depending on the polarity of the applied voltage. The location of the electrodes on his body indicated not always. If labelling is missing, to determine which electrode is connected to what pin, you can own. - How to determine the transformation ratio
The ratio of transformation is one of the fundamental parameters of any transformer. If this figure is unknown, it is possible to determine eksperimentalnim way. - How to write the date in English
Marking the calendar date in different countries is not only the language in which you write the name of the month, but also accepted in the country format - that is, the order in which you specify the day, month and year, as well as the characters used as delimiters between them. In addition, there are different established forms of writing dates to be used in official documents, literature, personal correspondence, etc. in a specific country or group of countries. - How to write Japanese words
Japanese language, despite its complexity, is becoming increasingly popular. There are more Japanese cartoons, products. And even the person who didn't study this language, you may want or need to write a word or phrase in Japanese. How to do it correctly? Sites created by Russian fans of Japanese culture and language, and also dictionaries will help you with this. - How to determine the radius of curvature
To study the motion of a physical object (car, cyclist, ball in roulette, it is sufficient to study the motion of some of its points. In the study of motion is that all points describe some of the curves. - How to solve a system of three equations with three unknowns
A system of three equations with three unknowns may not have solutions, in spite of a sufficient number of equations. You can try to solve it using the method of substitution or by the method of Kramer. The method of Kramer in addition to solving the system allows to assess whether the system is solvable, to how to find unknown values. - How to calculate the volume of the barrel
Many building materials, fuel, food products, arrive at the wholesale markets in containers of cylindrical or similar to those forms. It can be barrels, tanks, or cans. In all such cases for determining the amount of a substance you first need to calculate the volume. Form of these containers may differ from the classical cylinder, and therefore methods of calculation will differ. - How to determine a strong base
Strong base - an inorganic chemical compound formed the hydroxyl group -HE and alkaline (group I elements of the periodic system: Li, K, Na, RB, Cs) or alkaline earth metal (elements in group II Ba, Ca). Written as formula LiOH, KOH, NaOH, RbOH, CsOH, CA(Oh) co₂, VA(HE) and co₂. - How to calculate directional angle
Orientation in the field an important component of many professions. To do this, use maps and compasses. To determine the direction on the map for a specific object use directional angle and magnetic azimuth. - How to multiply brackets
Bracketed mathematical operation can contain variables and expressions of various degrees of complexity. To multiply such expressions will have to look for a solution in a General view, opening the brackets and simplifying the result. If in the brackets of the operation variables, only numerical values, opening the parentheses is not necessary, as in the presence of a computer user has access to very significant computing resources – it is easier to use them than to simplify the expression. - How to convert kg to cubic meters
At the decision of physical tasks is often required to translate physical quantities from one system of measure to another. As a rule, this process does not cause special difficulties. Units of homogeneous physical quantities are linked through their respective coefficients (occasionally, simple formulas). However, in practice, sometimes you have to work with heterogeneous values and translate, for example, kilograms per cubic meter - How to calculate the area of a cube
The cube is a special case of a parallelepiped, in which each of the faces formed by the right polygon is a square. Only the cube has six faces. To calculate the area is not difficult. - How to calculate voltage drop
The drop in the voltage across the load can be calculated if you know at least any two of the following three values: the capacity allocated at the load, current through it and its resistance. If you know more than two values, the conditions of the problem are redundant. - How to find linear velocity
Call the linear velocitywith which the body moves along an arbitrary trajectory. At a known length of the trajectory and the time in which it was passed, find the linear speed by the ratio of the length of time. Linear speed motion in a circle is equal to the product of the angular velocity, not its radius. Also use other formulas to determine linear velocity. It can be measured by the speedometer. - How to learn to solve fractions
Fractions allow us to Express in different forms the exact value of. With fractions you can perform the same math operation and with whole numbers: addition, subtraction, multiplication, and division. To learn how to solve fractions, it is necessary to remember about some of their features. They depend on the type of shot, the presence of an intact part that common denominator. Some arithmetic operation after performing require a reduction of the fractional part of the result. - How to determine the degree of oxidation of a substance
The degree of oxidation , the conditional charge of the atom in the compound, calculated on the assumption that it consists only of ions. Some elements have a constant degree of oxidation, while others are able to change it. In order to identify substances having different connections, different values will use a special algorithm.