Physics Key Words Essay Example for Free

Physics Key Words Essay Capacitance: ratio of charge stored per increase in potential difference. Capacitor: electrical device used to store charge and energy in the electrical field. Charged : object that has an unbalance of positive and negative electrical charges. Charging by conduction: process of charging by touching neutral object to a charged object. Charging by induction: process of charging by bringing neutral object near charged object, then removing part of resulting separated charge. Effective current: DC current that would produce the same heating effects. Effective voltage: DC potential difference that would produce the same heating effects. Electrical charge pump: device, often a battery or generator, that increase potential of electrical charge. Electrical circuit: continuous path through which electrical charges can flow. Electrical current: flow of charged particles. Electrical field: property of space around a charged object that causes forces on other charged objects. Electric field lines: lines representing the direction of electric field. Electric field strength: ratio of force exerted by field on a tiny test charge to that change. Electric generator: device converting mechanical energy into electrical energy. Electric potential: ratio of electric potential energy to charge. Electric potential difference: difference in electric potential between two points. Electric potential energy: energy of a charged body in an electrical field. Electron gas model: description of current flow through conductors. Electroscope: device to detect electric charges. Electrostatics: study of properties and results of electric charges at rest. Equivalent resistance: single resistance that could replace several resistors. Galvanometer: device used to measure very small currents. Ohm: SI unit of resistance; one volt per ampere. Â  Ohm’s law: resistance of object is constant, independent of voltage across it. Piezoelectricity: electric potential produced by deforming material. Potential difference: difference in electric potential between two points. Potential energy: energy of object due to its position or state. Potentiometer: electrical device with variable resistance; rheostat. Power: rate of doing work; rate of energy conversion. Resistance: ratio of potential difference across device to current through it. Resistance force: force exerted by a machine. Resistor: device designed to have a specific resistance. Resultant: vector sum of two or more vectors. Semiconductor: material in which electrical conduction is smaller than that in a conductor, but more than in insulator. Series circuit: circuit in which electrical current flows through each component, one after another. Series connection: arrangement of electrical devices so that there is only one path through which current can flow. Short circuit: low resistance connection between two points, often accidental. Watt: unit of power, one joule per second.

Rebel W/out A Cause Essay -- essays research papers

REBEL WITHOUT A CAUSE   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Rebel Without A Cause is a movie about three troubled, identity-seeking teenagers alienated from the world of their parents (Jim Stark, Judy, and Plato). Each of the movie’s main characters is searching for understanding, companionship, and a sense of belonging, much like most of the teenagers today. Even thought the movie is dated, it depicts the main problems and concerns that teens currently face. This film offers no answers. It merely presents the problems and the viewer is left to ponder how they'll turn out. I could identify with this movie on many levels. And I think that much of the young audiences out there could as well.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  The movie seems to tell the audience that just because teenagers do some bad things, doesn’t mean they’re bad at heart. I agree. In the movie, Jim is pressured into participating in a chickie run with a local gang leader named Buzz. A chickie run is where two guys race in a car towards a cliff. The first one to jump out from his car is a chicken. Jim feels he has something to prove. He doesn’t want to race, but he feels he has to show everyone he’s tough. Usually most teenagers today don’t want to get into trouble, but if it is necessary to put their lives on the line they will, simply to maintain their reputation. This is primarily associated to a phenomenon that teens encounter every day of thei...

Structured Cabling

1. What industry standards body and standards series numbers do you need to reference for Ethernet applications and cabling? The IEEE maintains the industry standards for Ethernet Protocols (or applications). This is part of the 802.3 series of standards and includes applications such as 1000Base-T, 1000Base-SX, 10GBase-T, and 10GBase-SR.2. What are the different types of category 6 cables and what should be recommended this network? Category 6 and category 6A are the types of cables; I would recommend Cat 6A cable over Cat 6 because cat 6A also supports 10Gbps which is for future speed.3. What cable would you recommend to offer the best shielding performance? You need STP or FIBER OPTIC cable to provide best shielding performance, optic fiber is expensive not easy to terminate ends and has no RFI EMI, whereas shielded twisted pair is easy and cheap.4. What type of cable would you use for the horizontal spaces and vertical links? Cat6 is the current standard for new installations of Ethernet cable. Depending on the space and certain building codes you need to decide between Plenum (CMP) or Riser (CMR). The difference being Riser cable is more durable, but puts out toxic fumes when caught on fire, so it is not suitable for spaces with open air flow. Dropped ceilings are generally considered Plenum spaces so therefore require plenum cable.5. What would you look for in trying to find fault if you had the following next and fext problems in 1Gbps links and difficulty meeting 10Gbps performance requirements? When finding fault in NEXT; the crosstalk is usually detected or found at the same end of the cable generating the signal and it is most common between 60 and 90 feet of the transmitter.In the other hand, when finding faults in FEXT the crosstalk occurs in the other end (opposite) of the cable. the problem is usually too many twists in the  cable; Alien Crosstalk (AXT) as the signal rate increase in a cable, this is a major source of interference, and a limiti ng factor, for running 10GBase-T (10Gbps) over UTP cabling. This kind of crosstalk usually â€Å"occurs when the signal being carried in one cable interferes with the signal being carried in â€Å"another cables†.TermsOsi- (Open Systems Interconnection) this is a standard description or â€Å"reference Model† for how messages should be transmitted between any two points in a telecommunication network. Its purpose is to guide product implementers so that their products will consistently work with other products. The reference model defines seven layers of functions that take place at each end of a communication. Although OSI is not always strictly adhered to in terms of keeping related functions together in a well-defined layer, many if not most products involved in telecommunication make an attempt to describe them in relation to the OSI model. It is also valuable as a single reference view of communication that furnishes everyone a common ground for education and dis cussion.Developed by representatives of major computer and telecommunication companies beginning in 1983, OSI was originally intended to be a detailed specification of interfaces. Instead, the committee decided to establish a common reference model for which others could develop detailed interfaces that in turn could become standards. OSI was officially adopted as an international standard by the International Organization of Standards (ISO). Currently, it is Recommendation X.200 of the ITU-TS. The main idea in OSI is that the process of communication between two end points in a telecommunication network can be divided into layers, with each layer adding its own set of special, related functions.Each communicating user or program is at a computer equipped with these seven layers of function. So, in a given message between users, there will be a flow of data through each layer at one end down through the layers in that computer and, at the other end, when the message arrives, another flow of data up through the layers in the receiving computer and ultimately to the end user or program. The actual programming and hardware that furnishes these seven layers of function is usually a combination of the computer  operating system, applications (such as your Web browser), TCP/IP or alternative transport and network protocols, and the software and hardware that enable you to put a signal on one of the lines attached to your computer.The 7 Standard Tcp/IPLayer 7: The application layer†¦This is the layer at which communication partners are identified, quality of service is identified, user authentication and privacy are considered, and any constraints on data syntax are identified. (This layer is not the application itself, although some applications may perform application layer functions.) Layer 6: The presentation layer†¦This is a layer, usually part of an operating system, that converts incoming and outgoing data from one presentation format to another (f or example, from a text stream into a popup window with the newly arrived text). Sometimes called the syntax layer.Layer 5: The session layer†¦This layer sets up, coordinates, and terminates conversations, exchanges, and dialogs between the applications at each end. It deals with session and connection coordination. Layer 4: The transport layer†¦This layer manages the end-to-end control (for example, determining whether all packets have arrived) and error-checking. It ensures complete data transfer. Layer 3: The network layer†¦This layer handles the routing of the data (sending it in the right direction to the right destination on outgoing transmissions and receiving incoming transmissions at the packet level). The network layer does routing and forwarding.Layer 2: The data-link layer†¦This layer provides synchronization for the physical level and does bit-stuffing for strings of 1's in excess of 5. It furnishes transmission protocol knowledge and management. Lay er 1: The physical layer†¦This layer conveys the bit stream through the network at the electrical and mechanical level. It provides the hardware means of sending and receiving data on a carrier.

Learning the Italian Alphabet

If you choose to learn the Italian language, youll need to start by learning its alphabet. When you have an innumerable amount of other â€Å"useful† languages to choose from, why would you choose Italian -- a language spoken by about 59 million people, compared to, let’s say Mandarin’s 935 million Despite the fact that every day more and more Italians are learning English, there is still a huge appeal to learn la bella lingua. Many people feel drawn to Italian because it’s a part of their ancestry, and learning Italian can be a great tool to utilize as you dig deeper into your family history. While you can do a lot of research in English, actually visiting your great grandfather’s birth town in Naples will require more than just a list of survival phrases to truly get a feel for the locals and hear stories about what the town was like while he was alive. What’s more, being able to understand and tell stories to your living family members will will add a depth and a richness to your relationships. Learning the Alphabet The Italian alphabet (lalfabeto) contains 21 letters: Letters / Names of the lettersa  Ã‚  ab  Ã‚  bic  Ã‚  cid  Ã‚  die  Ã‚  ef  Ã‚  effeg  Ã‚  gih  Ã‚  accai  Ã‚  il  Ã‚  ellem  Ã‚  emmen  Ã‚  enneo  Ã‚  op  Ã‚  piq  Ã‚  cur  Ã‚  erres  Ã‚  esset  Ã‚  tiu  Ã‚  uv  Ã‚  vuz  Ã‚  zeta The following five letters are found in foreign words: Letters / Names of the lettersj  Ã‚  i lungok  Ã‚  kappaw  Ã‚  doppia vux  Ã‚  icsy  Ã‚  ipsilon Learning the Basics If youre pressed for time, focus on the fundamentals. Study the Italian ABCs and Italian numbers, learn how to pronounce Italian words and ask questions in Italian, and brush up on the euro (after all, youll have to reach into your portafoglio—wallet—eventually). However, the quickest and most effective way to learn Italian is the total-immersion method. This means traveling to Italy for an extended period, studying at any of the thousands of language schools throughout the country, and speaking only Italian. Many programs include a home-stay component that enhances the cultural exchange. You literally eat, breathe, and dream in Italian. Whether its reading an Italian textbook, taking a language course at a university or local language school, completing workbook exercises, listening to a tape or CD, or conversing with a native Italian speaker. Spend some time every day reading, writing, speaking, and listening to Italian to become accustomed to the target language. Slowly but surely, your confidence will build, your accent will become less pronounced, your vocabulary will expand, and youll be communicating in Italian. Maybe youll even start speaking Italian with your hands!