Voltage measured by voltmeter. To the ends of the conductor was supported by a potential difference

Electric current thermal expansion coefficient table is called an ordered directional motion of charged particles. Charge carriers during the passage of electric current can be free electrons (electronic conduction) or ions (ionic conductivity). It is also possible mixed conductivity. With the current trend conditionally accepted direction of positive charges, in fact in metals electric current caused thermal expansion coefficient table by the movement of electrons in a direction opposite to the current direction.
First, a conductor through which current flows, heated. Second, thermal expansion coefficient table the electric current can change the chemical state of the conductor. Third, the current power has an effect on neighboring currents and magnetic body. This action is called magnetic current. Thus, the electric current causes thermal, chemical and magnetic thermal expansion coefficient table effects.
We must distinguish between the speed of propagation along the conductor changes the electric field that is 300 000 km / s, and speed directional movement in the conductor carriers, which is a few millimeters per second.
The condition for the existence of electric current availability of charged particles and electric field in the conductor, which acts on the particles with power and makes their orderly thermal expansion coefficient table movement. The field in any section of the conductor on the same module and does not depend on its shape. Inside the conductor line tension E parallel conductor surface, beyond - are at an angle to the surface.
Voltage measured by voltmeter. To the ends of the conductor was supported by a potential difference (voltage) and the conductor held constant current, requires action of external forces. Measures the outside forces physical quantity called electromotive force (EMF). It is the work of external forces on moving a single positive charge in a closed electrical circuit:
Where - resistivity conductor - conductor length [m], S - cross-sectional area [m2]. Resistivity is numerically equal to the resistance of the conductor which has the shape of a cube with an edge of 1 if the current directed along the normal to the two opposite faces of the cube.
From current source energy thermal expansion coefficient table is transferred by wire to a setting it is used: light bulb, radio and so on. D. To make this different circuits. Electric circuit consists of a source of energy plants that use electricity, connecting wires and circuit breakers for the circle. thermal expansion coefficient table Often in the electric circuit plug devices that control the amperage thermal expansion coefficient table and voltage in different parts of the circle - ammeters and voltmeters.
Series connection of conductors. In a series connection electric circuit thermal expansion coefficient table has no branches. All leaders turned in a circle at a time, one by one. Figure 1 shows the series connection of conductors thermal expansion coefficient table with supports 1, 2,. It could be two lamps, two motor windings etc.
The current thermal expansion coefficient table in both conductors same: because the conductors during the DC electric charge accumulates and not through any cross section of the conductor for a certain thermal expansion coefficient table period of time is the same charge. thermal expansion coefficient table
Parallel wiring. Figure 2 shows the parallel connection of conductors with supports 1, 2,. In this case, the electric current divides into parts. thermal expansion coefficient table Amperage -th and the first conductors denoted by. As a point - branching conductors (a point called a node) - no electric charge accumulates, the charge flowing per unit time in the node is equal to the charge emanating from a node in the same time. Therefore,
As a lighting thermal expansion coefficient table network supported voltage 220 or 127 V. At this voltage thermal expansion coefficient table devices are designed using electricity. Therefore, parallel connection - the most common way to connect different consumers. In this case, the failure of one unit does not affect the work of others, whereas in series connection failure of one device opens the entire range.
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