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2. Vacuum fluorescent display - Wikipedia

   en.wikipedia.org/wiki/Vacuum_fluorescent_display

   A VFD operates on the principle of cathodoluminescence, roughly similar to a cathode-ray tube, but operating at much lower voltages. Each tube in a VFD has a phosphor-coated carbon anode that is bombarded by electrons emitted from the cathode filament. [1] [2] In fact, each tube in a VFD is a triode vacuum tube because it also has a mesh ...

3. Variable-frequency drive - Wikipedia

   en.wikipedia.org/wiki/Variable-frequency_drive

   Small variable-frequency drive Chassis of above VFD (cover removed). A variable-frequency drive (VFD, or adjustable-frequency drive, adjustable-speed drive, variable-speed drive, AC drive, micro drive, inverter drive, variable voltage variable frequency drive, or drive) is a type of AC motor drive (system incorporating a motor) that controls speed and torque by varying the frequency of the ...

4. Vector control (motor) - Wikipedia

   en.wikipedia.org/wiki/Vector_control_(motor)

   In vector control, an AC induction or synchronous motor is controlled under all operating conditions like a separately excited DC motor. [21] That is, the AC motor behaves like a DC motor in which the field flux linkage and armature flux linkage created by the respective field and armature (or torque component) currents are orthogonally aligned such that, when torque is controlled, the field ...

5. Utilization categories - Wikipedia

   en.wikipedia.org/wiki/Utilization_categories

   DC-6: Switching of incandescent lamps: 60947-4-1 DC-12: Control of resistive loads and solid state loads with opto-coupler isolation: 60947-5-1 60947-5-2 DC-13: Control of D.C. electromagnetics: 60947-5-1 60947-5-2 DC-14: Control of D.C. electromagnetic loads having economy resistors in the circuit: 60947-5-1 DC-20: Connecting and disconnecting ...

6. Biden to cancel even more student debt, prioritize Ukraine ...

   www.aol.com/biden-cancel-even-more-student...

   Biden has already wiped away more than $175 billion in loans for millions of student borrowers, as part of a 2020 campaign promise to eliminate their debt.

7. Brawl erupts in Serbian parliament - AOL

   www.aol.com/news/brawl-erupts-serbian-parliament...

   Scuffles broke out in the Serbian parliament on Monday after opposition legislators raised banners accusing the ruling coalition of trying to shirk responsibility for the collapse of a train ...