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2. Ceiling fan - Wikipedia

   en.wikipedia.org/wiki/Ceiling_fan

   Brushed DC ceiling fans. Before the current switched from DC to AC, there were productions of brushed DC ceiling fans. Those are wired directly to DC wires. Brushless DC ceiling fans. This type of fans uses BLDC technology which offers much higher efficiency than normal fans driven with traditional AC motors. These are quieter than AC motor ...

3. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   In summer, ceiling fans and table/floor fans circulate air within a room for the purpose of reducing the perceived temperature by increasing evaporation of perspiration on the skin of the occupants. Because hot air rises, ceiling fans may be used to keep a room warmer in the winter by circulating the warm stratified air from the ceiling to the ...

4. Cool Down Your Space From Above With These Editor-Recommended ...

   www.aol.com/lifestyle/7-best-ceiling-fans-silent...

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5. Alternating current - Wikipedia

   en.wikipedia.org/wiki/Alternating_current

   The abbreviations AC and DC are often used to mean simply alternating and direct, respectively, as when they modify current or voltage. [ 1 ] [ 2 ] The usual waveform of alternating current in most electric power circuits is a sine wave , whose positive half-period corresponds with positive direction of the current and vice versa (the full ...

6. War of the currents - Wikipedia

   en.wikipedia.org/wiki/War_of_the_currents

   The war of the currents was a series of events surrounding the introduction of competing electric power transmission systems in the late 1880s and early 1890s. It grew out of two lighting systems developed in the late 1870s and early 1880s; arc lamp street lighting running on high-voltage alternating current (AC), and large-scale low-voltage direct current (DC) indoor incandescent lighting ...

7. FDA raises Costco organic egg recall to highest risk level - AOL

   www.aol.com/eggs-sold-costco-recalled-over...

   Eggs sold at Costco that may be contaminated with salmonella are being recalled. The recall covers Kirkland Signature Organic Pasture Raised 24-Count Eggs and has been upgraded to Class I.