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2. Electrical ballast - Wikipedia

   en.wikipedia.org/wiki/Electrical_ballast

   [1] [3] To prevent this, fluorescent tubes are connected to the power line through a ballast. The ballast adds positive impedance (AC resistance) to the circuit to counteract the negative resistance of the tube, limiting the current. [1] Several American magnetic ballasts for fluorescent lamps. The top is a rapid start series autoregulator ...

3. 0-10 V lighting control - Wikipedia

   en.wikipedia.org/wiki/0-10_V_lighting_control

   Dimming fluorescent ballasts and dimming LED drivers often use 0–10 V control signals to control dimming functions. In many cases, the dimming range of the power supply or ballast is limited. If the light output can only be dimmed from 100% down to 10%, there must be a switch or relay available to kill power to the system and turn the light ...

4. Fluorescent lamp - Wikipedia

   en.wikipedia.org/wiki/Fluorescent_lamp

   Near the end of life, fluorescent lamps can start flickering at a frequency lower than the power frequency. This is due to instability in the negative resistance of arc discharge, [74] which can be from a bad lamp or ballast or poor connection. New fluorescent lamps may show a twisting spiral pattern of light in a part of the lamp.

5. Dimmer - Wikipedia

   en.wikipedia.org/wiki/Dimmer

   This circuit is called a leading-edge dimmer or forward phase dimming. Waveform of the output voltage of a thyristor dimmer set for 60 volts RMS output, with 120 V input. The red trace shows the output device switching on about 5.5 ms after the input (blue) voltage crosses zero.

6. High-intensity discharge lamp - Wikipedia

   en.wikipedia.org/wiki/High-intensity_discharge_lamp

   Ballasts for discharge lamps. Like fluorescent lamps, HID lamps require a ballast to start and maintain their arcs. The method used to initially strike the arc varies: mercury-vapor lamps and some metal-halide lamps are usually started using a third electrode near one of the main electrodes, while other lamp styles are usually started using ...

7. Teen hunter murders parents, brother in gruesome crime that ...

   www.aol.com/teen-hunter-murders-parents-brother...

   A teenage hunter allegedly shot dead his parents and younger brother before taking his own life in a horrifying murder-suicide. Clifford Hunt Jr., 19, is believed to have shot parents Michelle, 48 ...

8. Daniels leads Commanders to first NFC championship in 33 ...

   www.aol.com/daniels-leads-commanders-first-nfc...

   Jayden Daniels threw for two touchdowns in a flawless performance by Washington’s dazzling rookie, and the Commanders stunned the Detroit Lions 45-31 on Saturday night to reach the NFC ...

9. Compact fluorescent lamp - Wikipedia

   en.wikipedia.org/wiki/Compact_fluorescent_lamp

   Circular and U-shaped lamps were devised to reduce the length of fluorescent light fixtures. The first fluorescent light bulb and fixture were displayed to the general public at the 1939 New York World's Fair. The spiral CFL was invented in 1976 by Edward E. Hammer, an engineer with General Electric, [7] in response to the 1973 oil crisis. [8]