To supply the different consumers may require sources of DC and AC voltage 12 Volts. In the first case it is sufficient to collect the battery from small-sized Nickel–cadmium and Nickel–metal hydride batteries or salt and alkaline electrochemical cells. In the second case, you need a network step-down transformer is required power with a voltage of 12 Volts to the secondary winding.

Vacuoles-membrane vesicles in the cell cytoplasm filled with cell SAP. In plant cells, vacuoles occupy up to 90% of the volume. Animal cells have temporary vacuoles which occupy not more than 5% of their volume. Function of vacuoles depend on what cell they are in.

When used in the calculation of such physical quantities as power, is often required to transfer watts to other units. The task is complicated by the fact that the technique still used obsolete units of measurement of power, such as "horsepower". But with all of the necessary tables and formulae, translate watts quite easily.

The magnetic field is characterized by a vector physical quantity, which is denoted by the symbol V and is called the magnetic induction (or magnetic induction). It is measured in Tesla(T) after the Yugoslav scientist Nikola Tesla. Due to the fact that the magnitude of the vector, you can find both direction and a numerical value.

To melt copper, as well, and any other metal is better to use special equipment and work under the guidance of the master. But if circumstances made you want to study the melting of metal at home, then make a special melting furnace.

Nitrites and nitrates - salts of nitric acid, but they differ from each other in composition. There is, for example, nitrites of lead or silver, and there are nitrate salts, metal oxides, hydroxides. And if the nitrites do not dissolve in water, the nitrates dissolved in it almost completely.

Scientists, mystics, just thinking people believe that everything in the world is energy. Atoms, molecules – everything is moving, changing, transforming, becoming different and returns to its original state. And all this thanks to the potential that is inherent in each quantum, from which the world was created.

Amps is a standard system unit of power (SI). Quite large by domestic standards, so multiple units (kiloampere) in practice are rarely used. But in the specifications of electronic equipment (especially in miniature) is common submultiple – mA. Household appliances generally described in this parameter as power (measured in watts). Connect appliances to the mains you have, has a limit for the current. To avoid constant tripping of the fuse, you will need to understand how, in practice, translate amps to other units.

Magnesium is a fairly abundant element of the periodic system, he ranked 7th in the percentage of its content in the earth's crust. Salts of this metal are found in large quantity in seawater and sediments smooshing lakes as well as in the form of minerals and natural carbonates, which include dolomite, magnesite. You know there are more than 200 different natural compounds, containing magnesium, but as raw materials are usually used only some, such as magnesite, dolomite, carnallite.

In the life of almost every owner of a mobile phone of the GSM standard, a situation arises where it is necessary to strengthen the signal of the cellular network. In the area of the base station of any operator of when there are places where the signal is weak or completely disappears. This "dead" zone. They can occur both indoors and outdoors, but there are ways to strengthen the signal connection.

Aluminium has much in common with other metals. First, like many other metals, it has a silvery-white color, metallic luster and high conductivity. Second, it is easy to form oxides, and react with acids. So it is sometimes necessary to distinguish it from other metals.

Concentration is the relative content of a component in a more complex composition. Typically, the concentration of a substance is determined in solutions or mixtures of various substances. In molecular-kinetic theory under the concentration you know the number of gas molecules per unit volume.

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.

Speed characteristics of the movements of the body, characterizing the swiftness of its movement, that is, the distance traveled by them per unit time. This parameter is a vector, and therefore has not only the magnitude but also the direction. To determine the direction of the velocity is required in a number of physical tasks.

The insidiousness of electricity is that it has no visible signs of danger. Therefore, the person is often too late realizes that he was in the zone of action of electric current.

In the mid 50-ies of the last century in the Soviet Union was in full swing work on the ambitious installation, designed for the study of the microcosm. The giant structure was launched in 1957. Soviet scientists were unprecedented at the time the charged-particle accelerator called a synchrotron.

The concept of momentumand it was introduced into physics by the French scientist Rene Descartes. Descartes himself called this value the momentum and "momentum". The term "momentum" came later. A physical quantity equal to the product of the mass of a body by its velocity is called momentum of the body: p=m*v. Pulse have only the moving body. Unit of momentum in international system of units is the kilogram*meter per second (1 kg*m/s). For momentum fair fundamental law of nature called the law of conservation of momentum.

In atomic units (abbreviated a.e.m.) Express the mass of the smallest known natural objects - elementary particles, atoms and molecules. The numerical value of this quantity many times have changed since the first formulation of the physical meaning of Englishman John Dalton in 1803, and the last update was done in 2010. This unit is not included in the SI system, so sometimes you need to convert atomic units into kilograms.

Life is so diverse that it's impossible to predict. In ancient times, even the simplest natural phenomena seemed people something inexplicable, and most importantly - random. However, at some stage of development of science in the light of the concept of mechanical determinism.

Sound waves are called mechanical deformations that propagate in any elastic medium (liquids, solids, gases). Like other waves, sound is characterized, in particular, the frequency of oscillation. Depending on the initial conditions to find the frequency of the sound in different ways.

The volume describes the size of the space enclosed within the boundary of any object. Mass is another parameter that determines the strength of its interaction with other physical objects or created their fields. The third parameter - the density is a characteristic of the material enclosed within the boundary of the object. These three quantities are related to each other is quite a simple ratio.

On any terrain you can clearly navigate using a compass. But to learn to determine the direction, you need to know how to calculate the azimuth. To do this, measure the angle between the direction to the object to which you want to move, and the Northern direction.

Water can exist in three basic States of aggregation: solid, liquid and gaseous. The steam, in turn, is unsaturated and saturated - have the same temperature and pressure of boiling water. If the temperature of water vapor when the pressure exceeded 100 degrees Celsius, such steam is called superheated. Often while studying the school course of physics or in the course of the technological process, the problem arises: to determine the water vapor pressure under some specific conditions.

The inductance of the coil depends on a number of its design features. These include number of turns, diameter, type of core, its location etc. in order that the inductance has changed, sufficient to modify at least one of these parameters.

Volga – Europe's largest river. It begins in the Valdai hills and flows into the Caspian sea, forming a Delta with an area of 19 thousand square kilometers. Length of the Volga is 3,530 km.

Reactive power current can be obtained only in circuits with alternating current, in which there are inductors, capacitors, or both. The vast majority of cases, the reactive power does not perform useful work, and is spent on generation of electromagnetic fields. Many devices specify the power factor, which is denoted Cos(φ). It is easy to calculate the reactive power consumed by the device knowing power. If such a coefficient, it can be calculated independently.

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.

Everyone at least once in my life had to walk in the woods and think about what to do if you get lost. To navigate the terrain can be different, a lot of ways, the most common are the compass and visible objects surrounding countryside.

When calculating the amount of electricity consumed, it is customary to use the term "kilowatt-hours". This value is the actual power consumption device power N kilowatt a number of hours X.

Sunset – extraordinarily beautiful and peaceful sight. Inspired by this phenomenon, the artists create beautiful paintings, photographers - amazing footage. Scientists explain the red color of the sunset physical property of certain wavelengths of light perceived by the human eye.