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2. Power inverter - Wikipedia

   en.wikipedia.org/wiki/Power_inverter

   A power inverter device that produces a multiple step sinusoidal AC waveform is referred to as a sine wave inverter. To more clearly distinguish the inverters with outputs of much less distortion than the modified sine wave (three-step) inverter designs, the manufacturers often use the phrase pure sine wave inverter .

3. Grid-tie inverter - Wikipedia

   en.wikipedia.org/wiki/Grid-tie_inverter

   The grid tie inverter (GTI) must match the phase of the grid and maintain the output voltage slightly higher than the grid voltage at any instant. A high-quality modern grid-tie inverter has a fixed unity power factor, which means its output voltage and current are perfectly lined up, and its phase angle is within 1° of the AC power grid. The ...

4. Amazon Vine - Wikipedia

   en.wikipedia.org/wiki/Amazon_Vine

   Launched in 2007, [1] [2] Amazon Vine is an internal service of Amazon.com that allows manufacturers and publishers to receive reviews for their products on Amazon. [3] [4] [5] Companies pay a fee to Amazon and provide products for review. The products are then passed to Amazon reviewers, who can publish a review.

5. Criticism of Amazon - Wikipedia

   en.wikipedia.org/wiki/Criticism_of_Amazon

   As customer reviews have become integral to Amazon marketing, reviews have been challenged on accuracy and ethical grounds. [358] In 2004, The New York Times [359] reported that a glitch in the Amazon Canada website revealed that a number of book reviews had been written by authors of their own books or of competing books. Amazon changed its ...

6. Wikipedia:Reference desk/Archives/Science/December 2005 ...

   en.wikipedia.org/wiki/Wikipedia:Reference_desk/...

   It's also good to check if the website has an RSS feed available that you can easily extract data with; PHP has some good XML parsing functions you could use. Though if Amazon doesn't issue RSS i'd suggest the above. -Benbread 15:40, 2 December 2005 (UTC) Actually, Amazon has an API to make this sort of thing much easier. I think it probably ...

7. Time-domain reflectometer - Wikipedia

   en.wikipedia.org/wiki/Time-domain_reflectometer

   If a pure resistive load is placed on the output of the reflectometer and a step signal is applied, a step signal is observed on the display, and its height is a function of the resistance. The magnitude of the step produced by the resistive load may be expressed as a fraction of the input signal as given by:

8. Electric vehicle - Wikipedia

   en.wikipedia.org/wiki/Electric_vehicle

   An electric vehicle (EV) is a vehicle whose propulsion is powered fully or mostly by electricity. [1] EVs encompass a wide range of transportation modes, including road and rail vehicles, electric boats and underwater vessels, electric aircraft and electric spacecraft.

9. Tesla coil - Wikipedia

   en.wikipedia.org/wiki/Tesla_coil

   The high voltage from the supply transformer that charges the capacitor is a 50 or 60 Hz sine wave. Depending on how the spark gap is set, usually one or two sparks occur at the peak of each half-cycle of the mains current, so there are more than a hundred sparks per second.