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2. Cable reel - Wikipedia

   en.wikipedia.org/wiki/Cable_reel

   Retractable cable reels are particularly useful for environments where access to electricity or air is needed in a wide variety of places. All retractable hose reels operate using a constant-force spring to provide torsion for the spool, and a ratcheting mechanism to prevent the cable from retracting while it is being used.

3. Applications of capacitors - Wikipedia

   en.wikipedia.org/wiki/Applications_of_capacitors

   The effects of varying the characteristics of the dielectric can also be used for sensing and measurement. Capacitors with an exposed and porous dielectric can be used to measure humidity in air. Capacitors are used to accurately measure the fuel level in airplanes; as the fuel covers more of a pair of plates, the circuit capacitance increases.

4. AC adapter - Wikipedia

   en.wikipedia.org/wiki/AC_adapter

   An AC adapter or AC/DC adapter (also called a wall charger, power adapter, power brick, or wall wart) [1] is a type of external power supply, often enclosed in a case similar to an AC plug. [2] AC adapters deliver electric power to devices that lack internal components to draw voltage and power from mains power themselves.

5. Motor capacitor - Wikipedia

   en.wikipedia.org/wiki/Motor_capacitor

   Motor capacitors are used with single-phase electric motors [3]: 11 that are in turn used to drive air conditioners, hot tub/jacuzzi spa pumps, powered gates, large fans or forced-air heat furnaces for example. [1] A "dual run capacitor" is used in some air conditioner compressor units, to boost both the fan and compressor motors. [1]

6. Capacitive power supply - Wikipedia

   en.wikipedia.org/wiki/Capacitive_power_supply

   By changing the value of the example in the diagram by a capacitor with a value of 330 nF, a current of approximately 20 mA can be provided, as the reactance of the 330 nF capacitor at 50 Hz calculates to = and applying Ohm's law, that limits the current to . This way up to 48 white LEDs in series can be powered (for example, 3.1 V/20 mA/20000 ...

7. Aluminum electrolytic capacitor - Wikipedia

   en.wikipedia.org/.../Aluminum_electrolytic_capacitor

   The voltage rating does not need to be symmetrical; "semi-polar" capacitors can be made with different thicknesses of oxide coatings, so they can withstand different voltages in each direction, [38] but these bipolar electrolytic capacitors are not adaptable for main AC applications instead of power capacitors with metallized polymer film or ...