There is a third electrode charged negatively with respect to the cathode, called the Wehnelt or control electrode.
2.
A hot cathode is at an advantage, as ionization of the gas is made easier; thus, the tube's control electrode is more sensitive.
3.
Other devices that have control electrodes as well as acting as unidirectional current valves are used where more than simple rectification is required e . g ., where variable output voltage is needed.
4.
This places the control electrode at a maximum distance from the space-charge region surrounding the filament, minimizing the amount of electrons collected by the control electrode, and thus minimizing the input current.
5.
This places the control electrode at a maximum distance from the space-charge region surrounding the filament, minimizing the amount of electrons collected by the control electrode, and thus minimizing the input current.
6.
When the control electrode is made less negative, electrons from the cathode can travel to the anode because the positive attraction from the anode prevails over the negative repulsion caused by the slightly negative voltage on the control grid.
7.
Each time a pulse is applied to a control electrode, a glow discharge moves to a step electrode; by providing ten electrodes in each tube and cascading the tubes, a counter system can be developed and the count observed by the position of the glow discharges.
8.
The display section's anode is usually directly connected to the receiver's full positive high tension ( HT ) voltage, whilst the triode-anode is usually ( internally ) connected to a control electrode mounted between the cathode and the target-anode, and externally connected to + HT via a high-value resistor, 1 megohm typically.
9.
In one of various embodiments of EWOD-based microfluidic biochips, investigated first by Cytonix in 1987 and subsequently commercialized by Advanced Liquid Logic, there are two parallel glass plates, and the bottom plate contains a patterned array of individually controllable electrodes, and the top plate is coated with a continuous insulator coated with a hydrophobic is added to the plates to decrease the wettability of the surface and to add capacitance between the droplet and the control electrode.
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