2006-10-02 22:59:43 · 14 answers · asked by loopy 2 in Science & Mathematics ➔ Physics
In fact all resistors! Because no resistor has a real constant R = resistance.
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2006-10-02 23:18:50 · answer #1 · answered by Thermo 6 · 0⤊ 3⤋
Ohm's law V = I*R applies whether R is a linear or non linear resistance. If V increases I will increase whether R is linear or not. The only way I can decrease if V increases is if R is a negative resistance. Negative resistors don't exist they would violate the laws of thermodynamics, however there are devices that act as negative resistance over a portion of their operating range. These devices ( tunnel diodes are an example) take energy from a power supply and basically power a tank circuit making an oscillator. A semiconductor diode is a non linear device the current through a diode varies exponentially with respect to the voltage across the diode. Its dynamic resistance can be found from the derivative of current with respect to voltage.
2016-03-13 00:14:50 · answer #2 · answered by Anonymous · 0⤊ 0⤋
a non-ohmic conductor is a conductor that doesnt obey ohm's law. this law states that for any ohmic conductor, the potential difference between any two points on its circuit is directly proportional to the amount of current passing through the circuit. basically that's where the equation v=ir came from
2006-10-02 23:08:19 · answer #3 · answered by xodusj 2 · 1⤊ 0⤋
This Site Might Help You.
RE:
What is a non-ohmic conductor?
2015-08-08 04:30:26 · answer #4 · answered by Anonymous · 0⤊ 0⤋
those conductors which don't follwow ohm's law
V v/s I graph of a non ohmic conductor is not a straight line
2015-05-21 23:03:04 · answer #5 · answered by prashant 1 · 1⤊ 0⤋
A conductor which does not obey Ohm's law. That is, one for which the potential difference across its ends does not vary linearly; or the graph of V versus I is not a straight line.
2006-10-03 06:12:23 · answer #6 · answered by Entho 2 · 3⤊ 0⤋
THE RESISTANCE OF a body is
R + j X
it consists of an imaginary part (capacitance , inductance) and a real part that is the ohmic resistance. let us call it impedance then.
a coil a capacitor etc has both part of impedance (resistance and reactance)
but in exercises the inductors and capacitors are trearted ideally and they neglet the series ohms of the coil and the parallel ohms of the capacitor etc.
therefore you can treat something as a conductor that has no Ohmic resistance, but has a reactance.
in real life there is not such a thing of course since looses are everywhere especially due to friction therefore reistance is always present.
in real life if you have a motor says engineers refer to it as an inductive load (not a resistive load as in a tungsten lamp )
2006-10-02 23:16:59 · answer #7 · answered by Emmanuel P 3 · 0⤊ 0⤋
Ohmic conductor follows Ohm's Law i.e. R = V/I
Non-Ohmic conductor does not follow this law and R depends on V and is no longer a constant of proportionality but a variable called differential resistance.
To check whether a given device is ohmic or not, one plots V versus I and checks that the curve is a straight line.
2006-10-02 23:04:06 · answer #8 · answered by mitzy 5 · 3⤊ 2⤋
Simply one which does not obeys ohm's law i.e. its IV characteristic on a graph is not a straight line passing through the origin. There is not a linear relationship and the law V=IR does not apply. Some example are Thermistors, diodes, bulb etc
2006-10-02 23:03:58 · answer #9 · answered by IQEinsten 2 · 0⤊ 1⤋
Ohm's law - Wikipedia, the free encyclopediaThe 'conductor' mentioned by Ohm's law is a circuit element across which the voltage is ... The relation V = IR can also be applied to non-ohmic devices, ...
en.wikipedia.org/wiki/Ohm's_law - 51k
2006-10-02 23:05:28 · answer #10 · answered by Anonymous · 0⤊ 2⤋
The tunnel diode is a most interesting example, since due to quantum mechanical effects, it displays negative resistance over part of its characteristic curve.
2006-10-02 23:09:13 · answer #11 · answered by Frank N 7 · 0⤊ 0⤋