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2. Airbus E-Fan - Wikipedia

   en.wikipedia.org/wiki/Airbus_E-Fan

   The batteries are mounted in the inboard section of the wings. They have enough power for one hour and take one hour to recharge. An onboard backup battery is available to make an emergency landing if power runs out while airborne. The E-fan's landing gear consists of a retractable fore and aft wheel, and a fixed wheel under the wings ...

3. High-volume low-speed fan - Wikipedia

   en.wikipedia.org/wiki/High-volume_low-speed_fan

   A commercial fan delivering air at 20 miles per hour (mph) requires about 64 times as much power as a similar sized fan delivering air at five mph. [8] Airspeed, combined with fan "effectiveness," means that when the objective is to cool people or animals, very large, low-speed commercial fans are more efficient and effective than small high ...

4. Computer fan - Wikipedia

   en.wikipedia.org/wiki/Computer_fan

   Fans may be controlled by sensors and circuits that reduce their speed when temperature is not high, leading to quieter operation, longer life, and lower power consumption than fixed-speed fans. Fan lifetimes are usually quoted under the assumption of running at maximum speed and at a fixed ambient temperature.

5. Fan (machine) - Wikipedia

   en.wikipedia.org/wiki/Fan_(machine)

   A household electric fan A large cylindrical fan. A fan is a powered machine that creates airflow. A fan consists of rotating vanes or blades, generally made of wood, plastic, or metal, which act on the air. The rotating assembly of blades and hub is known as an impeller, rotor, or runner. Usually, it is contained within some form of housing ...

6. Computer fan control - Wikipedia

   en.wikipedia.org/wiki/Computer_fan_control

   A fan controller with LEDs indicating fan status and potentiometers and switches to control fan speeds Another method, popular with PC hardware enthusiasts, is the manual fan speed controller. They can be mounted in an expansion slot or a 5.25" or 3.5" drive bay or come built into a computer's case.

7. Battery charger - Wikipedia

   en.wikipedia.org/wiki/Battery_charger

   A 10-ampere-hour battery could take 15 hours to reach a fully charged state from a fully discharged condition with a 1-ampere charger as it would require roughly 1.5 times the battery's capacity. Public EV charging stations often provide 6 kW (host power of 208 to 240 V AC off a 40-ampere circuit). 6 kW will recharge an EV roughly six times ...