Data Sheet

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302. Norton’s Theorem
Build the circuit shown on the left, then turn on the switch (62) and you
will hear some medium volume sounds of a police siren from the speaker
(93). Also, you will see the star LED (70) is ashing at the same time.
Norton’s Theorem states that any linear electrical network consisting
entirely of voltage and current sources and resistances can be replaced
by an equivalent current source in parallel with an equivalent resistance.
Norton’s Theorem is the inverse of Thevinin’s Theorem.
303. Reactance
Connect points C and D with a 4-wire (4) in project #302, turn on the
switch (62) and you will hear gun shots in medium volume and the star LED
(70) will ash at the same time. Reactance is the opposition of a circuit or
input to AC current due to inductance or capacitance. So the reactance
in a circuit is only related to the capacitors and inductors in the circuit.
304. Relation between Reactance, Resistance,
and Impedance
Connect points A and B with a 4-wire (4) in project #302, turn on the
switch (62) and you will hear a re siren in medium volume and the star
LED (70) will ash. Impedance is the opposition to all types of current
ow, due to resistance, capacitance and inductance. So you can think
of impedance like the sum of resistance and reactance.
305. Conductance
Connect points E and F with a 4-wire (4) in project #302. Turn on
the switch (62) and the sounds of space battle will turn on in medium
volume with the star LED (70) will ash. Conductance is the measure of
ease in which current can ow through a circuit or input. Conductance
is the inverse of resistance, that is conductance = 1/resistance.
306. Unit of Measure for Conductance:
Siemens & Mhos
Connect points G and H with a 4-wire (4) in project #302, turn on the
switch (62) and you will hear music in medium volume and the star LED (70)
will ash to the music. Conductance is measured in Siemens. One Siemen
is equal to 1/(1 Ohm). Since Siemens are the inverse of Ohms, the term
Mhos is sometimes used instead of Siemens as the unit for conductance.
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