WikiVisually
The entire wiki reimagined as a visual magazine with video discovery · Watch your interests come alive
WikiVisually
The entire wiki reimagined as a visual magazine with video discovery · Watch your interests come alive
Nature The World Movies USA Top Art Fine & Rare History Ivy & Inquiry
Vacuum tube
Videos
A vacuum tube, vac tube, electron tube, thermionic valve, or tube is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been
Later thermionic vacuum tubes, mostly miniature style, some with top cap connections for higher voltages
Later thermionic vacuum tubes, mostly miniature style, some with top cap connections for higher voltages
Operating tubes in an audio power amplifier, the hot cathodes emitting their distinctive red-orange glow
Operating tubes in an audio power amplifier, the hot cathodes emitting their distinctive red-orange glow
Illustration representing a primitive triode vacuum tube and the polarities of the typical DC operating potentials. Not shown are the impedances (resi
Illustration representing a primitive triode vacuum tube and the polarities of the typical DC operating potentials. Not shown are the impedances (resistors or inductors) that would be included in series with the C and B voltage sources.
US WWV radio station signal generator using vacuum tubes, 1943
US WWV radio station signal generator using vacuum tubes, 1943
Diode
Videos
A diode is a two-terminal electronic component that conducts electric current primarily in one direction. It has low resistance in one direction and high resistance in the other.
Vacuum tube
…In both types the electrons are accelerated from the cathode to the anode by the electric field in the tube. The first, and simplest, vacuum tube, the diode or Fleming valve, was invented in 1904 by John Ambrose Fleming. It contains only a heated electron-emitting cathode and an anode. Conventional current…
Close-up view of a silicon diode. The anode is on the right side; the cathode is on the left side (where it is marked with a black band). The square s
Close-up view of a silicon diode. The anode is on the right side; the cathode is on the left side (where it is marked with a black band). The square silicon crystal can be seen between the two leads.
A high power vacuum tube diode used in radio equipment as a rectifier
A high power vacuum tube diode used in radio equipment as a rectifier
Various semiconductor diodes. Left: A four-diode bridge rectifier. Next to it is a 1N4148 signal diode. On the far right is a Zener diode. In most dio
Various semiconductor diodes. Left: A four-diode bridge rectifier. Next to it is a 1N4148 signal diode. On the far right is a Zener diode. In most diodes, a white or black painted band identifies the cathode into which electrons will flow when the diode is conducting. Electron flow is the reverse of conventional current flow.
A vacuum tube containing two power diodes
A vacuum tube containing two power diodes