What does impedance mean?
Definition of impedance : something that impedes : hindrance: such as. a : the apparent opposition in an electrical circuit to the flow of an alternating current that is analogous to the actual electrical resistance to a direct current and that is the ratio of effective electromotive force to the effective current.
What does impedance mean in medical terms?
[im-pe´dans] 1. obstruction or opposition to passage or flow, as of an electric current or other form of energy. 2.
What is a synonym for impedance?
electrical resistance, resistivity, immunity, ohmic resistance, underground, resistor, resistance, opposition, electric resistance.
How do you use impedance in a sentence?
Impedance sentence example. The impedance coils shown connected between the battery and the lines and between the latter and the transmitters are joined up non-inductively as regards the transmitter circuits, but inductively as regards the secondary circuits.
What is impedance Z?
Impedance (Z), in electrical devices, refers to the amount of opposition faced by direct or alternating current when it passes through a conductor component, circuit or system. Impedance is null when current and voltage are constant and thus its value is never zero or null in the case of alternating current.
What causes impedance?
the resistance is caused by the collisions of the electrons with the atoms inside the resistors. the impedance in a capacitor is caused by the creation of an electric field. the impedance in an inductor is caused by the creation of a magnetic field.
What is the impedance of the human body?
The average internal human-body impedance has been measured to be 1,000 Ω in 60 human cadavers (male and female) and 500 Ω in live bodies. By accepting the cost of replacing voltage-distribution cables with insulated cables, electrical safety levels can be significantly increased.
What is the opposite of impedance?
In electrical engineering, admittance is a measure of how easily a circuit or device will allow a current to flow. It is defined as the reciprocal of impedance, analogous to how conductance & resistance are defined.
How do you measure impedance?
Impedance is calculated by dividing the voltage in such a circuit by its current. In short, impedance can be described as limiting the flow of current in an AC circuit. Impedance is indicated by the symbol “Z” and measured in ohms (Ω), the same unit used to measure DC resistance.
What is capacitor impedance?
Impedance of a capacitive element; it is measured in ohms and is a measure of how much the capacitive element “controls or impedes” the level of current through the network.
What is the medical definition of impedance?
Medical Definition of impedance. 1: the apparent opposition in an electrical circuit to the flow of an alternating current that is analogous to the actual electrical resistance to a direct current and that is the ratio of effective electromotive force to the effective current.
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What is the difference between impedance and resistance?
In the case of direct current (DC), impedance is the same as resistance, and depends solely upon the materials from which the circuit is made. For an alternating current ( AC ), however, two additional factors can contribute to the impedance: capacitance and inductance.
What is the importance of impedance in electrical analysis?
Electrical impedance. The notion of impedance is useful for performing AC analysis of electrical networks, because it allows relating sinusoidal voltages and currents by a simple linear law. In multiple port networks, the two-terminal definition of impedance is inadequate, but the complex voltages at the ports and the currents flowing…