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2. Compact fluorescent lamp - Wikipedia

   en.wikipedia.org/wiki/Compact_fluorescent_lamp

   The luminous efficacy of a typical CFL is 50–70 lumens per watt (lm/W) and that of a typical incandescent lamp is 10–17 lm/W. [38] Compared to a theoretical 100%-efficient lamp ( 680 lm/W ), CFL lamps have lighting efficiency ranges of 7–10%, [ 39 ] versus 1.5–2.5% [ 40 ] for incandescents.

3. Transformer - Wikipedia

   en.wikipedia.org/wiki/Transformer

   In electrical engineering, a transformer is a passive component that transfers electrical energy from one electrical circuit to another circuit, or multiple circuits.A varying current in any coil of the transformer produces a varying magnetic flux in the transformer's core, which induces a varying electromotive force (EMF) across any other coils wound around the same core.

4. Incandescent light bulb - Wikipedia

   en.wikipedia.org/wiki/Incandescent_light_bulb

   Luminous efficacy is measured in lumens per watt (lm/W). The luminous efficiency of a source is defined as the ratio of its luminous efficacy to the maximum possible luminous efficacy, which is 683 lm/W. [ 80 ] [ 81 ] An ideal white light source could produce about 250 lumens per watt, corresponding to a luminous efficiency of 37%.

5. 27.5 mountain bike - Wikipedia

   en.wikipedia.org/wiki/27.5_Mountain_bike

   In 2007, 27.5 inch wheels for mountain bike use was popularized by Kirk Pacenti, [6] [12] and in 2013 at least 10 companies had launched models with 27.5 inch wheels, [3] with some parts manufacturers following suit.

6. iPad Mini (5th generation) - Wikipedia

   en.wikipedia.org/wiki/IPad_Mini_(5th_generation)

   The fifth-generation iPad Mini (stylized and marketed as iPad mini [2] and colloquially referred to as iPad Mini 5 [3]) is a tablet computer in the iPad Mini line, developed and marketed by Apple Inc. Announced in a press release along with the third-generation iPad Air on March 18, 2019 and released the same day. [4]

7. Ford EcoBoost engine - Wikipedia

   en.wikipedia.org/wiki/Ford_EcoBoost_engine

   Ford EcoBoost race car. EcoBoost is a series of turbocharged, direct-injection gasoline engines produced by Ford and originally co-developed by FEV Inc. (now FEV North America Inc.). [6]