Vacuum tubes are generally not considered ohmic devices. Ohmic materials exhibit a linear relationship between voltage and current, described by Ohm's law (V = IR). In contrast, vacuum tubes operate based on thermionic emission and can exhibit nonlinear characteristics, meaning their current-voltage relationship can vary based on factors like temperature and applied voltage. Thus, they do not maintain a constant resistance across different operating conditions.
2 states
It means that the glass envelope has leaked and is no longer a vacuum. Air inside has oxidized the getter. They generally no longer work in this condition.
An 'ohmic' resistor is one which obeys Ohm's Law. For Ohm's Law to apply, the resistance of a circuit must be constant over the range of incremental voltages applied to it. If the resistance changes over an incremental range of voltages, then it is said to be 'non-ohmic', and it does not obey Ohm's Law.
when the vacuum sucks up things it goes through the tube and into the bag ...Unless you are talking about electronics, then a vacuum tube is used to form an amplifying circuit. Some tubes can emit cathode rays onto a screen (Cathode Ray Tube = CRT) to display a picture and some can function as diodes to regulate current flow.
an electron tube containing a near-vacuum that allows the free passage of electric current.
Vacuum tubes are non-ohmic devices because their resistance changes with voltage and current. This non-linearity in resistance is due to the nature of the electron flow within the vacuum tube, causing it to exhibit non-ohmic behavior.
the vacuum tube
A vacuum tube is simply a tube with no oxygen nor carbon dioxide in it (aka no air).
Millman's theorem
no.....thermistors are not ohmic.
who made the vacuum tubes
Kilobytes and vacuum tubes are not in the same category. At best, a twin triode vacuum tube is a single flip-flop and can hold 1 bit of information, making a vacuum tube about 0.000122 of a kilobyte.
an electron tube containing a near-vacuum that allows the free passage of electric current.
ohmic conductor does obey ohm 's law. non ohmic conductor does not obey ohm's law.
cellphone
which law follow non ohmic substances
A non-ohmic resistor doesn't have a constant resistance. A ohmic resistor has a constant resistance.