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2. Cable reel - Wikipedia

   en.wikipedia.org/wiki/Cable_reel

   A cable reel is a round, drum-shaped object such as a spool used to carry various types of electrical wires. [1] Cable reels, which can also be termed as drums, have been used for many years to transport electric cables, fiber optic cables [2] and wire products. Cable reels usually come in four different types, each with their own uses: wood ...

3. Counterpoise (ground system) - Wikipedia

   en.wikipedia.org/wiki/Counterpoise_(ground_system)

   It usually consists of a single wire or network of horizontal wires, parallel to the ground, suspended above the ground under the antenna, connected to the receiver or transmitter's "ground" wire. [2] The counterpoise functions as one plate of a large capacitor, with the conductive layers of the earth acting as the other plate. [2] [3]

4. Reel - Wikipedia

   en.wikipedia.org/wiki/Reel

   Tow trucks hold steel cable on reels; Rope, wire and electrical cable is often supplied on reels; Badge reels are used to hold access badges, smart cards and other externally tethered small items such as keys and clippers; A cave diving reel is a safety equipment used for running a distance line [1]

5. Ground (electricity) - Wikipedia

   en.wikipedia.org/wiki/Ground_(electricity)

   Long-distance electromagnetic telegraph systems from 1820 onwards [a] used two or more wires to carry the signal and return currents. It was discovered by German scientist C.A. von Steinheil in 1836–1837, that the ground could be used as the return path to complete the circuit, making the return wire unnecessary. [2]

6. File:Ground loop.svg - Wikipedia

   en.wikipedia.org/wiki/File:Ground_loop.svg

   Two circuits share a common ground wire. The voltage of the ground connection, V G, should ideally be zero. However if the ground conductor has significant resistance, R G, the current flowing through it from circuit 1 will cause a voltage drop across it V G = I 1 R G. Since they share the ground wire, this voltage appears as unwanted ...

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