Tungsten is an example of a conductor that does not obey Ohm's Law. If you were to plot a graph of current against voltage, over a range of voltages, you will find that the result is a curve - showing that current is not directly proportional to voltage, which is the requirement for Ohm's Law.
While the ratio of voltage to current will indicate what the resistance happens to be for that particular ratio, you will find that, for tungsten, that ratio continually changes as you increase voltage - proving that tungsten does not obey Ohm's Law. The general rule is that if there is no straight-line relationship between voltage and current, then Ohm's Law doesn't apply.
The equation, R = V/R, does notrepresent Ohm's Law; it is derived from the definition of the ohm. Ohm's Law is a law of constant proportionality and constant proportionality only applies to linear conductors.
No semiconductor's do not obey ohm's laws.
I hope you mean the thermistor. If so,well it does not obey Ohms law. When current flows through the thermistor its temperature start increasing which reduces the resistance of the thermistor. A reduction in resistance at the same supply voltage will cause the current to increase. Thus it's not obeying Ohms law.
ohms law.
No.
no
No semiconductor's do not obey ohm's laws.
I hope you mean the thermistor. If so,well it does not obey Ohms law. When current flows through the thermistor its temperature start increasing which reduces the resistance of the thermistor. A reduction in resistance at the same supply voltage will cause the current to increase. Thus it's not obeying Ohms law.
As transistors are made of semiconductors, they do notfollow Ohm's law.A: they cannot follow exactly ohms law since they are themselves no linear active devices
the vibration produced in the coil of a speaker is due to current passing through it hence it obey ohms law
Not all conductors obey Ohm's Law. There are certain materials, like semiconductors and diodes, that do not follow Ohm's Law due to their nonlinear behavior. An example of a conductor that obeys Ohm's Law is a resistor, where the current through it is directly proportional to the voltage applied.
Very few conductors obey Ohm's Law, and its the rise in temperature of the conductor when current flows though it that prevents it from obeying Ohm's Law. Some alloys, such as constantan, obey Ohm's Law over a limited range because, over that range, changes in temperature don't affect their resistance. It's really time that we stopped teaching Ohm's Law, as it is not universal, and applies to very few conductors and hardly any electronic components!
ohms law.
30 ohmsAnswerAn incandescent lamp doesn't obey Ohm's Law, because the ratio of voltage to current changes as the supply voltage is varied. All you can say is that, when the applied voltage is 9.0 V, then the resistance will happen to be 30 ohms. If you change the applied voltage to some other value, then you will find the resistance will have changed too. Ohm's Law isn't a universal law; in fact, most materials and circuit devices do not obey Ohm's Law, and tungsten, from which lamp filaments are manufactured, is an example of a metal that does not obey Ohm's Law (we call them 'non-linear' or 'non-ohmic')
which obey ohms law ANSWER: Not all potentiometers are linear some are made to follow a logarithm function some follows an exponential function. A linear potentiometer will have a linear curve. Materials that obey Ohm's Law are called 'linear' or 'ohmic'; those that don't are called 'non-ohmic' or 'non-linear'.
Obey The Law was created on 1926-11-05.
In point of fact, vacuum tubes do obey Ohm's law. Everything electrical obeys Ohm's law. The reason vacuum tubes don't appear to obey the law is that not every consideration takes into account the fact that vacuum tubs have dynamicresistance. Ohm's law, as applied to "pure" ohmic resistors, requires constant resistance, which no material, no matter how good, exhibits. In the real world, you have to consider that resistance can vary along with voltage and current, and this "complicates" things.
If you plot current against variations in voltage for a semiconductor device, such as a diode, you will find that it does not result in a straight-line graph. So we say that the device is 'non-linear'. Ohm's Law ONLY applies to linear devices (those that produce a straight-line graph).In other words, Ohm's Law only applies to devices whose ratio of voltage to current is constant for variations in voltage.