What is an electrical impedance?
Electrical impedance, often simply called impedance, is measured to describe how easily electricity flows through the AC perimeter (AC). It describes the total amount of opposition that the circuit represents the current. In the perimeter of direct current (DC), resistance is used to describe the same properties, but other factors come into the game in the AC system. Electrical impedance is a function of both resistance and reaction, due to the cyclic nature of the AC circuit. Generally, the resistance of the circuit is determined by the number of free electrons available in the conductor that has an electrical current. For example, a large -diameter copper conductor will have more free electrons than a copper conductor with a smaller diameter and will represent a lower resistance. The type of metal used for the conductor also plays a role, because less conductive metal has less free electrons and offers higher current resistance.
Thdruhá component of the electrical impedance, reactance, is caused by cycling of alternating electric current. A typical electricity of householdreverse the direction 60 times per second or at 60 Hertz. Each cycle causes additional electrical and magnetic opposition to the current. This opposition is called reactance.
Like resistance, measurement measurement for electrical impedance is OHM. Impedance is usually expressed as a difference in the potential voltage through the perimeter, divided by the maximum amount of current passing through the circuit. The simplest expression of electrical impedance is given in the mathematical equation Z = V/I, in which it represents impedance, V is voltage and I represent the current.
Electrical measurements are useful for more than just copper wires and circuit boards. The human body also has a certain amount of conductivity, resipostoj and even impedance. In fact, the medical community has been using electrical impedance as a diagnostic tool since the beginning of the 20th century. Medical tests that rely on impedance use the fact that different types of tissues have a differentImpedance size.
Electrical impedance display techniques, such as tomography electrical impedance (EIT), have been used for many years and continue to improve and gain popularity. Since malignant tissue usually shows a lower impedance than healthy tissue, this type of testing has shown a great promise in early detection of breast cancer. The typical EIT test includes the location of the electrodes on the tested part of the body. The weak electric current is applied to two or more electrodes and the differences in voltage are measured. The test could be repeated several times and despite many combinations of electrodes to get the most accurate results.