Every body resists an electric current. The magnitude of the resistance of the body conventionally

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For the first time dependence of the current on the circuit area of the applied voltage set in 1827 German scientist G. Ohm. (Chart circuit for establishing this relationship is shown in rys.5.3.). It is experimentally proved that the current in a metal conductor steam price calculator at a constant temperature steam price calculator is directly steam price calculator proportional to the potential difference at its ends and inversely proportional to its resistance. H.Om actually revealed that for any conductor ratio applied voltage to the amperage that while it occurs is of the steel, which also was named conductor resistance. That is where. The last entry is called a mathematical expression of Ohm's law for the chain in integral form.
Every body resists an electric current. The magnitude of the resistance of the body conventionally divided into 3 classes: conductors, semiconductors and insulators. Leaders - a material that is the best conductor current steam price calculator due to the presence of a large number of free charge carriers. steam price calculator It first of all - metals. The resistance of a conductor depends on the type of material, size, strain and temperature. At a constant temperature steam price calculator resistance uniform conductor of length l S section are unchanged from the ratio: where - coefficient of proportionality, which is called the resistivity of the conductor.
Units of measurement: [ρ] = [1 ohm m], [γ] = [1 ohm -1 m -1]. Often, for convenience in calculations used for Common Units of measurement resistivity steam price calculator - [ρ] = [1 (Ohm mm 2) / m].
Where - conductor steam price calculator resistance steam price calculator at T 0 = 273 K - temperature coefficient of resistance. For chemically pure materials = 1/273 K -1 K -1 0,004. With decreasing temperature and approaches the absolute zero conductor resistance decreases. In 1911 Kammerlinh-Oness discovered the phenomenon of superconductivity, which is that at a temperature close to 0 K electrical steam price calculator resistance leaders abruptly vanishes. The importance of this discovery is that when the circle to create a superconducting steam price calculator electric current, its value extremely long time remains unchanged.
1). Series connection of conductors (rys.5.5). The peculiarity of this connection is that the current strength through every resistance (consumer) will be the same. Then, according to Ohm's law -. Consequently, the series connection of voltage conductors on each of them proportional to its resistance.
The voltage at the ends of the plot in a series connection equal to the amount of stress on the bearings, ie. Location and followed that with a series connection of resistance of the chain is the sum of all resistance leaders.
2). Parallel connection conductors (rys.5.6). The sign is branching parallel connection of the circuit in which electric current is divided according to the number of enabled conductors (consumers). The point, where the leaders called a node. Based on the fact that such a point electric charge can accumulate, so the law of conservation of charge steam price calculator and it follows steam price calculator that the current strength after branching is the sum of currents to the branch, either. As the voltage is the potential difference between the two point range, steam price calculator it remains constant for all conductors simultaneously enabled, so and so. D.
Therefore, when parallel wiring of the current in the conductors are inversely proportional to their resistances. Calculate the total resistance range is possible with the following considerations, from which it follows that. Got that the parallel connection of conductors to the reciprocal value of the total resistance is the sum of values inverse steam price calculator to the resistance information is taken on the site: http://fizmat.7mile.net/
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