What is an electrical resistance?
electrical resistance is the characteristics of the conductor, semiconductor or insulator that limits the amount of current flow. It is determined by atomic or molecular properties that can either allow or prevent the flow of free electrons by material. Electric resistance is almost the same as electrical resistance with a slight difference in the way the electrical resistance can refer to the resistance of the specific length of the material. For example, the basic unit of resistance could apply to the amount of resistance per unit of copper cable length.
Ohm's law provides the relationship between electrical resistance (R), voltage (V) and current in amps (a). Resistance is the voltage ratio to the current. For the same voltage, the current current is the result of lower resistance. The electric fuse should have a very low voltage drop when it is placed in a series with electric load. If the load is 9.999 ohms and the fuse has a resistance of 0.001 ohms, the supply voltage 10 V) creates a current of 1 A and the voltage via the fuse is negligible at 0.001 V.
Electric ResistNtal tomography is a imaging tool that is able to present a three -dimensional profile of built -in materials. This is achieved by means of built -in electrodes and direct current (DC) to create a two -dimensional image. By using perpendicular image planes, it is possible to have an idea of a three -dimensional layout.
different elements with remarkable electrical resistance have different uses in electrical applications. Silver and gold are very low -electrical resistant elements that are used for special applications such as microboding used in the semiconductor industry. Copper is a chosen commercial conductor, which is designed for acceptable electrical resistance and relatively low price. Carbon is a low -cost material for high resistance media, resulting in a huge variety of carbon resistance on the market. The high stability of tungsten in relatively high temperatures makes it a common choice for requests for bulbs and fibers such asThey are bulbs, variable resistors and electric heaters.
Contact electrical resistance is usually very low when conductive surfaces are not contaminated. In the case of transmission contacts, the pressure that temporarily connects to them determines how low the resistance will drop when the contact is closed. If the pressure is not enough and the current is high, it is possible for the contact to create a plasma that can melt the contact. The spark generated as a result of repeated closure shortens the life of the relay. In most cases, it is good to use electronic DC switches, such as a controlled silicon (SCR) or use electronic AC switches (AC) such as a three-terminal AC switch (triac).