In electrical circuits, static resistance is the ratio

of the voltage across a circuit element to the current

through it. However, the ratio of the voltage to the

current may vary with either voltage or current. The

ratio of the change in voltage to the change in

current is known as dynamic resistance.

Circuit elements composed of certain materials exhibit

the property that, over certain voltage ranges,

current is a decreasing function of the voltage. This

range of voltages is known as a negative resistance

region.

It may be more correct to say that a circuit element

has a negative differential resistance region than to

say that it exhibits negative resistance because even

in this region the static resistance of the circuit

element is positive, while it is more precisely the

slope of the resistance curve which is negative.

[HDN/ well it takes awhile to think about that one,

but acccording to the slope definition, we plot V vs

R, but with SrFe heating the resistance goes down with

the impressed voltage; With the additional

complication that when lower resistances of the load

are reached with the highest heats; that low ohmic

load will also drop the output voltage of the source

powering it; according to maximum power transfer laws:

similar to action of that load being placed as an

interphasal resonant one, where impedance matching

then becomes possible.]

An example of an electronic component exhibiting the

negative differential resistance region is the tunnel

diode. Such a device, when biased into its negative

differential resistance region, will act as an

amplifier.

In conformance with the known law of conservation of

energy, a plot of the negative differential resistance

region of a component cannot normally pass through the

origin.

Some work by Professor Deborah Chung at the University

of Buffalo has discovered a composite configuration of

carbon nanotubes which appears to exhibit anomalous

results which resemble a static negative resistor.

However, the physical interpretation of this

observation is still controversial.

Gabriel Kron, while a scientist for General

Electric,[1]

(http://www.quantum-chemistry-history.com/Kron_Dat/KronGabriel1.htm)

is thought to have built a negative resistor for the

US Navy's "Network Analyser" (probably an analogue

computer) in the 1930s; but as it was a military

project no details have ever come to the public.[2]

(http://www.cheniere.org/misc/kron.htm) One of his

papers does contain a blasÃ© "Although negative

resistances are available for use with a network

analyzer..."[3]

(http://www.quantum-chemistry-history.com/Kron_Dat/Kron-1945/Kron-PR-1945/Kron-PR-1945.htm)

Another concept of negative resistance exists in the

domain of radio frequency antenna design. This is also

known as negative impedance. It is not uncommon for an

antenna containing multiple driven elements to exhibit

apparent negative impedance in one or more of the

driven elements.

HDN/ To further delve into this concept of negative

impedance; we further classify the meaning of positive

impedance; which is simply the sum effects of both the

inductance and the resistance upon the currents of the

load. A positive impedance then means that the

currents will be less then what would exist if the

inductance were not present where Ohms Law V=IR then

applies. What a negative impedance may appear to do;

dependent on how we measure the circuit conditions; is

to provide for a measurement whereby instead of the

impedance detracting from the possible current

delivery by ohms law amount; we find current above and

not below that amount.

This happens when three adjacent spirals of high

mutual induction are attached to the alternator three

phase/ and wired in WYE, where the currents of each

phase must return on another phase. The voltage

mesurement of each WYE section is actually a delusion

brought upon by mutual induction; and when measuring

the V/I ratio for each wye segment, the measurement

shows a conduction above that possible by ohms law.

However when the Delta voltage measurements are

made,of that same WYE load application; the delusion

is made apparent. The same system of adjacent spirals

in three phase does not yeild a negative impedance

measurment when wired in Delta. But what does occur is

impedance cancellation by three magnetic fields all

simultaneously summing to zero at any instant of time;

a sort of three phase scalar magnetic compression.

Each of these magnetic fields induces currents on its

neighbors; and those currents are in the same

direction as the currents made from its line

connections. However APPARENTLY even though both of

these sources of emf make currents in the same

direction, the inductive source appears to have an emf

opposite to that of the line connected source, so that

when the net difference is noted by that voltage

mesurement of the segment in WYE, we find that the

inside voltage measurements are much smaller then

would should exist by mesurements on the outside delta

voltage sources; where this is normally a 1.7 ratio,

but now this has been formed into a higher ratio.

The further idiosychasies involved here is that a

single wind of these segments is only 1/4 of the

amount used for maximum energy transfer, therefore

that load without impedance becomes an overload

circuit placed upon the alternator. However this

simply means that more careful field current

adjustments need be made for making the circuit

conditions. The fact that each winding is making

additional currnt on its neghboring phases also means

the ratio of R(int)/ R(load) is being driven even

further in the overload state.

HDN

Tesla Research Group; Pioneering the Applications of Interphasal Resonances http://groups.yahoo.com/group/teslafy/