Telephone Wiring
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[phpostock]Telephone Wiring, 10[/phpostock]
How Does The Telephone Work?
Alexander Graham Bell was credited for having invented the telephone on March 10, 1876. It was a magnificent invention, that helped us in so many ways. It is only proper that we give proper recognition to this device by trying to understand how it functions. But we would not go to the extent of explaining acoustics or the science of sound to make our point.
First let us define telephone as a device capable of replicating voice and transmitting it from one point to another in the fastest means possible. Imagine, we can now hear the replicated voice of our relatives on the other side of the planet in a matter of seconds through telephone wires. Yes, the voice we hear on the phone is a product of replication by devices.
Let us try to define some terms in simple language. Human voice is a sound, which is produced by the movement or vibration of our lips, tounge and mouth. Sound wave travels through the air, water or solid objects. It is important to realize that sound can be converted into electrical energy, which we will elaborate later. Telephone is a device that can transform sound into electrical energy and transmit it through copper wires to another point.
Remember that as grade school children, we had for a school project a basic telephone, composed of two cans connected by a string. When we pull the string to form a straight line and make it tight, we can actually communicate through the cans. This is possible because when one student talks into the can, the bottom of the can vibrates back and forth with sound waves that travel through the straight line of string, which the other student who puts his ear near the can hears. The telephone uses the same principle, but instead of string, it uses wire.
Instead of empty cans, the telephone uses a mouthpiece, composed of a transmitter, which is made up of a thin metal diaphragm. Inside the diaphragm is a small chamber filled with carbon granules. When we speak, sound waves cause the granules to compress, which allows a low-voltage electric current to pass. This current comes from batteries at the telephone company. The electric current then travels. The louder we speak, the more the granules are compressed, and the heavier voltage of electric current is released. When the carbon grains are compressed, electric currents pass through them more easily. If we don't make any sound, no sound waves will cause the grains to compress, which would not allow electric currents to pass.
By copying the pattern and loudness of our voice, the release of the electric current through the carbon grains serves as the same pattern when the current hits the diaphragm on the other line. In other words, the vibrations caused by our voice are converted into electrical impulses that travel through wires until they reach the receiver. The receiver (ear-piece), which also has an iron diaphragm, converts the electrical impulses back into sound. Once the electric current hits the electromagnetic field in the receiver, the diaphragm vibrates and produces sound waves almost exactly like the pattern of sound waves at the point of origin.
Simply put, the telephone set has transmitter, receiver, a connection and a switch, which allows us to dial a number and exchange replicated voices.
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Keeping Food Cold in Refrigerators
How do freezers produce ice? How do food items get cold inside refrigerators? And how do air-conditioning units release cool air? All these appliances use the same process to function - refrigeration. But to know what refrigeration is, we need to understand the science of thermodynamics in the simplest way possible.
Thermodynamics has something to do with heat? Yes, it is about heat, which is ironically the opposite of coldness, which is our topic. To make it simple, let us define the word "cold" as an adjective characterized by the low degree of heat. Also, let us define refrigeration as the process of removing heat from an object to make it cold. With these twin definitions, we assume that freezers, refrigerators and air-conditioning units are machines that take away heat from an object or a surface. In other words, these machines suck heat out of an enclosed space.
Taking away heat from an object is possible through the system of evaporation. Have you ever observed that it becomes cooler after it had rained. This is because the rain, the perfect result of evaporation, takes away the heat of the soil. Have you ever felt fresher after taking a bath. This is because the water on your body takes away some of the heat from your skin.
Freezers, refrigerators and air-con units follow the same principle of evaporation, but instead of using water, they use refrigerants that vaporize at much colder temperatures. These chemicals - like ammonia, freon, and Greenfreeze - are injected into a tube or evaporator coil inside the machine where they turn from liquid into gas into liquid through evaporation via compression. As they evaporize through compression, these refrigerants absorb and take away heat from the inside surface of the refrigerator and transfer the heat to the outside surface of the refrigerator as they become liquid again while traveling through a coil mostly located at the back or bottom of the machine. The inside surface of the refrigerator thus becomes cool and the outside, hot.
A compressor is responsible for the process of evaporation. Essentially, the compressor machine, powered by an electric motor, squeezes the refrigerants into the coil that extends to the outside part of the machine. It gathers the refrigerant vapor articles inside the coil and compresses them into liquid form again, which in effect releases heat outside the body of the freezer, refrigerator or air-con unit. When the compressed gas passes through the coil on the back or bottom of the machine, the hot gas can lose its heat to the atmosphere outside the machine. Because the refrigerants travel through the tube and the coil endlessly, the whole refrigeration process is repeated over and over again, without allowing the refrigerants to leak.
Here, the common explanation is that when compressing refrigerants to a higher pressure, the temperature of the refrigerants will rise and release heat. By the time the chemicals cool off, significant amount of heat has been released from it. As the refrigerants cool down and condense into liquid form again, they flow through a device called an expansion valve, which has a small opening. The liquid refrigerants become very cold as they travel fast and pick up heat from the surface of the machine. Between the expansion valve and the compressor, there is a low-pressure area because the compressor is pulling the refrigerant gas out of that side. When the liquid refrigerants hit the low pressure area, they boil and changes into a gas. This is called vaporizing. The refrigerants then pass through the coil touching the inside surface of the machine where they cool and absorb heat at the same time, and in the process, pull the heat out of the compartment.
Cooling machines therefore are composed of a compressor, which compresses the refrigerant gas into liquid; expansion valve, where the liquid refrigerants move from a high-pressure zone to a low-pressure zone, so they can expand and evaporate; and the coils, which extend to the outside part of the machine. While evaporating, the refrigerants absorb heat from the inside surface and transfer the heat outside. The cycle repeats endlesslly until the inside surface of the refrigerator or the freezer becomes very cool. Freezers, which are more enclosed than refrigerators, allow their surface to cool to the extent of turning water into ice. In case of the air-conditioning unit, a blower pushes the cool air from the machine into the room.
About the Author
Louie Wallcrawler loves to travel on a aircraft...
Items Below From Amazon
[phpzon]Telephone Wiring, 10[/phpzon]
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Telephone Wiring Block $10.7 - TEC telephone wiring blockTEC-742A |
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4 Port Wiring Harness for X16 Phone System $18.94 The wiring harness is used to connect the X16 telephone line ports to the telephone line ports to the telephone company's telephone lines. |
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Linear H616 Telephone Master Hub $28.99 6 6.25" x 1" x 2.75" 110 punch-down connectors Six enclosure grid spaces The Model H616 Telephone Master Hub provides a superior method of telephone distribution for structured wiring systems. The Model H616 distributes up to four telephone lines to up to six telephone wall plates. An RJ-31X jack is provided for security system connection. Additionally, the Model H616 includes an RJ-45 jack for telephone line expansion. H616 H616 Telephone Master Hub Hub Incoming/Outgoing Linear Linear, LLC RJ-11 Telephone RJ-45 Network Telephone www.linearcorp.com |
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Channel Vision C-0441 Wiring Kit $38.99 2 Year Limited 24 Telephone Drops of 4 lines each 100 Pair Capacity Switch Based Security Panel Loop The model C-0441 is a versatile, high capacity phone distribution panel that mounts a standard 100 pair 110-type cross-connect block on a structured wire module. A switch based security panel loop is provided (more reliable than the typical RJ-31x jack). C-0441 C-0441 100 Pair Telephone Distribution Wiring Kit Channel Vision Channel Vision Technology Wiring Kit www.channelvision.com |
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Panasonic KX-TS3282W Corded Telephone $85.99 1 2 28 3 3.66 lb 8 KX-TS3282W Corded Telephone AC adapter Two-line integrated telephone with one Intercom path allows paging and conversation between stations. Up to eight phones can be used on this system without special wiring. Features include Call Waiting-ready, Caller ID-ready, 28-Number speed-dial, three-way conference calling, multifunction three-line LCD with clock, flexible extension numbers, memory redial and mute function. Telephone is capable of toll restriction and includes headset jack and AC adapter. Set on desk or mount to wall. Call Transfer Call Waiting Clock Conference Call Desk EcoLogo Flash Button Hold Button Intercom KX-TS3282W KX-TS3282W Corded Telephone KXTS3282W LCD Memory Mute Button Page Panasonic Pause Redial Speed Dial Standard Phone Volume Control Wall-mountable White Yes www.panasonic.com |
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Cooper Wiring Devices 3546-4V Standard 4-Wire Two Telephone Jacks with Wallplate $2.2 3546-4V Type: Accessories |
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Cooper Wiring Devices 3532-6LA Flush Mount Wallplate with Telephone Jack 6-Condu $1.35 3532-6LA Type: Accessories |
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Cooper Wiring Devices 3562V Decora-Style Mounting Strap with Telephone and Coaxi $3.53 3562V Type: Accessories |
