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2. Light switch - Wikipedia

   en.wikipedia.org/wiki/Light_switch

   In electrical wiring, a light switch is a switch most commonly used to operate electric lights, ... 120 V 15 A. Around the middle of the 20th century, "quiet ...

3. Fender Princeton Reverb - Wikipedia

   en.wikipedia.org/wiki/Fender_Princeton_Reverb

   This Paul Rivera-specified Fender guitar amplifier was introduced in 1982 to replace the Princeton Reverb. [1] It was a completely different and significantly more powerful amplifier. [ 2 ] Designed by Ed Jahns, it featured a built-in reverb, treble boost and mid boost controls, and a switchable lead (overdrive) effect.

4. Relay - Wikipedia

   en.wikipedia.org/wiki/Relay

   A relay is an electrically operated switch. It consists of a set of input terminals for a single or multiple control signals, and a set of operating contact terminals. The switch may have any number of contacts in multiple contact forms, such as make contacts, break contacts, or such combinations thereof.

5. Compact fluorescent lamp - Wikipedia

   en.wikipedia.org/wiki/Compact_fluorescent_lamp

   CFLs are extremely cost-effective in commercial buildings when used to replace incandescent lamps. Using average U.S. commercial electricity and gas rates for 2006, a 2008 article found that replacing each 75 W incandescent lamp with a CFL resulted in yearly savings of $22 in energy usage, reduced HVAC cost, and reduced labour to change lamps.

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   mail.aol.com

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7. Multiway switching - Wikipedia

   en.wikipedia.org/wiki/Multiway_switching

   In contrast to a simple light switch, which is a single pole, single throw (SPST) switch, multiway switching uses switches with one or more additional contacts and two or more wires are run between the switches. When the load is controlled from only two points, single pole, double throw (SPDT) switches are used.

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   Ad-Free AOL Mail offers you the AOL webmail experience minus paid ads, allowing you to focus on your inbox without distractions, for just $4.99 per month.

9. Transistor - Wikipedia

   en.wikipedia.org/wiki/Transistor

   In the example of a light-switch circuit, as shown, the resistor is chosen to provide enough base current to ensure the transistor is saturated. [93] The base resistor value is calculated from the supply voltage, transistor C-E junction voltage drop, collector current, and amplification factor beta.