Technical Sheet - Glossary

RESISTENCE: In DC circuits, the opposition presented by a material to a current flow, measured in ohms (Ω). In AC circuits, resistance is the real component of impedance, and can be higher than the value measured at DC.
IMPEDANCE: Global opposition that a circuit, a cable or component offers to the flow of alternating current. It includes both the resistance of the ballast. It is usually expressed in ohms (Ω) and is indicated by the symbol Z.
CAPACITANCE: The ability of a dielectric material sandwiched between two conductors of electricity when there is accumulating a potential difference between conductors. The unit of measurement is the Farad, ie the value of capacity that will earn the position of a Coulomb, between conductors when there is a potential difference of one volt. In alternating current, the farad is the capacitance value that will allow one ampere of current when the voltage of a capacitor changes at a rate of once a second.
INDUTTANCE: Property of a conductor or circuit which is resistant to the current change. Makes changes are delayed compared to changes in current and voltage is measured in Henry.
ATTENUATION: Decrease the amplitude of a signal that travels through a transmission medium such as a cable or electrical circuits. Attenuation is measured as a ratio or the logarithm of a ratio (decibel).
VELOCITY OF PROPAGATION: The speed of transmission of electricity in a cable of some length with respect to speed in a vacuum. It is usually expressed as a percentage.


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