Full text search :

impedance

Symbol Z; unit Î©. In general, the property, expressible as a complex number, of a simple linear system that relates the amplitude and phase (2) of its response to the amplitude and phase of a stimulus. Specifically in electrical systems, it is the complex quantity Z that relates the applied voltage V and current I, both in complex form (See complex number): V= ZI.A capacitor has an impedance 1/iÏ‰C, an inductance iÏ‰L and a resistance R,where Ï‰ is the angular frequency of the current or voltage. As with resistances in a d.c. circuit, if two or more impedances are in series (3), their impedances add; if in parallel (4) their reciprocals add:

{img src=show_image.php?name=image_09_06.gif }

Bookmark this page:

<< former term		next term >>
impact parameter		impedance matching