III classe

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Lezioni del=20 3=B0

Le=20 Definizioni

Tutti i = Simboli

DIGITALE

Introduzione

Reti = logiche

Integrati = TTL

Mappe di = Karnaugh

Scale di=20 Integrazione

Multiplexer = (MUX)

Reti = Sequenziali

I = decoder

ANALOGICA

Thevenin

Millman

Principi di = Norton

Principio = P.S.E.

Principi di=20 Kirchoff

COMPONENTI

Il = diodo

La=20 resistenza

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Mohms" } else { if (ohmage >= 10e3) { ohmage /= 10e2 return "" + ohmage + " Kohms" } else { return "" + ohmage + " ohms" } } } function CalcolaOhm() { var moltiplicatore = new Array() moltiplicatore[0] = 0 moltiplicatore[1] = 1 moltiplicatore[2] = 2 moltiplicatore[3] = 3 moltiplicatore[4] = 4 moltiplicatore[5] = 5 moltiplicatore[6] = 6 moltiplicatore[7] = -1 moltiplicatore[8] = -2 moltiplicatore[9] = -2 moltiplicatore[10] = -1 moltiplicatore[11] = -2 var tolleranza = new Array() tolleranza[0] = "+/-5%" tolleranza[1] = "+/-10%" tolleranza[2] = "+/-0,5%" tolleranza[3] = "+/-1%" tolleranza[4] = "+/-2%" var form = document.FrmRes1 var d0 = form.Prima_banda.selectedIndex var d1 = form.Secda_banda.selectedIndex var d2 = form.terzabanda.selectedIndex var m = form.moltiplicatore.selectedIndex var t = form.Tolleranza.selectedIndex var ohmage = (d0 * 100) + (d1 * 10) + d2 ohmage = eval("" + ohmage + "e" + moltiplicatore[m]) ohmage = format(ohmage) var tol = tolleranza[t] document.FrmRes1.result.value = ohmage + ", " + tol } function setHund(choice) { CalcolaOhm() } function setTens(choice) { CalcolaOhm() } function setOnes(choice) { CalcolaOhm() } function setMult(choice) { CalcolaOhm() } function setTol(choice) { CalcolaOhm() } ------=_NextPart_000_0000_01C89BB7.B7D10B30 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Content-Location: http://elettronicafree.altervista.org/terzanno/analogica/resistenza/Teoria_Resistenze.htm

&nbs= p; =20 COMPONENTI E CIRCUITI

&= nbsp; =20 Definizioni sui circuiti

Si=20 definisce circuito = elettrico o rete=20 elettrica un insieme di componenti=20 tra

loro variamente collegati. Si definisce nodo un=20 punto d=92incontro di almeno

tre=20 componenti. Si definisce ramo un=20 tratto di circuito compreso tra 2 nodi.

2 o = pi=F9 resistenze=20 si dicono in serie,=20 quando si trovano nello stesso ramo e

sono attraversate dalla stessa corrente. In = figura1 (in=20 alto) sono rappresentate

le=20 resistenze in serie e il modo in cui si calcolano. Due o pi=F9=20 resistenze

si=20 dicono in parallelo,=20 quando sono collegate dagli stessi nodi, e hanno la

stessa d.d.p. ( differenza di potenziale ) ai = loro capi.=20 In figura 1 (al centro)

sono rappresentate le resistenze in parallelo = e il modo=20 in cui si calcolano.

Quando 2 o +=20 resistenze sono in serie costituiscono un partitore di=20 tensione,

perch=E9 la tensione totale si ripartisce = sulle singole=20 resistenze in modo

direttamente proporzionale al loro = valore.