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2. Smart doorbell - Wikipedia

   en.wikipedia.org/wiki/Smart_doorbell

   A smart doorbell is an internet-connected doorbell that notifies the home owner on his or her device (smartphone or any other gadget) when a visitor arrives at the door. It activates when the visitor presses the button of the doorbell, or alternatively, when the doorbell senses a visitor with its built-in motion sensors. The smart doorbell lets ...

3. Doorbell - Wikipedia

   en.wikipedia.org/wiki/Doorbell

   Doorbell at the entrance of Chetham's Library, Manchester, England Sound of a two-tone mechanical doorbell. A doorbell is a signaling device typically placed near a door to a building's entrance. When a visitor presses a button, the bell rings inside the building, alerting the occupant to the presence of the visitor. Although the first ...

4. Heterojunction solar cell - Wikipedia

   en.wikipedia.org/wiki/Heterojunction_solar_cell

   Heterojunction solar cells are compatible with IBC technology, ie. the cell metallisation is entirely on the back surface. A Heterojunction IBC cell is often abbreviated to HBC. A HBC structure has several advantages over conventional SHJ cells; the major advantage is the elimination of shading from the front grid, which improves light capture ...

5. Luna Ring - Wikipedia

   en.wikipedia.org/wiki/Luna_Ring

   The near side of the moon, from where energy would be beamed to Earth, according to the Luna Ring project. Luna Ring is a speculative engineering project which consists of a series of solar generators, disposed around the equator of the Moon, that could send the generated electric energy back to the Earth via microwaves from the near side of the Moon. [1]

6. Electrical system of the International Space Station - Wikipedia

   en.wikipedia.org/wiki/Electrical_system_of_the...

   International Space Station solar array wing (Expedition 17 crew, August 2008).An ISS solar panel intersecting Earth's horizon.. The electrical system of the International Space Station is a critical part of the International Space Station (ISS) as it allows the operation of essential life-support systems, safe operation of the station, operation of science equipment, as well as improving crew ...

7. Solar inverter - Wikipedia

   en.wikipedia.org/wiki/Solar_inverter

   Internal view of a solar inverter. Note the many large capacitors (blue cylinders), used to buffer the double line frequency ripple arising due to single-phase ac system.. A solar inverter or photovoltaic (PV) inverter is a type of power inverter which converts the variable direct current (DC) output of a photovoltaic solar panel into a utility frequency alternating current (AC) that can be ...