Output Device Essay Example for Free

Output Device Essay What are OUTPUT DEVICES? Output devices are hardware devices that display or present information to the user or other people. The monitor, printer and the speaker are one of the examples. PRINTER It is a computer device that produces a permanent copy on paper of information from the computer. There are several kinds of printers: ink jet, dot-matrix and laser jet printers. DOT MATRIX PRINTER Prints by hammering or striking an ink-soaked cloth ribbon against a paper. The advantage of this kind of printer is that it can easily create carbon copies because of the impact action of the printing process. The cost per page of printing is relatively cheap. INK JET PRINTER The ink comes form a cartridge of liquid ink and this printer is simply black and white or in full color. LASER JET PRINTER It produces high quality prints or graphics on paper. Color and black and white printing is available. It is based on the principle of electrostatic printing and photography wherein the source of ink is a toner. PLOTTER It comes in 2 types: pen plotter and electrostatic. Pen plotter is a vector graphics printing device which operates by moving a pen over the surface of paper. It is usually used for large printing requirements of CAD drawings of houses, buildings, cars, airplanes and others. It is also used for vinyl and plastic used for billions and posters. THERMAL PRINTERS Produce prints on thermal paper by selective heating wherein heated areas turn black creating an image. It is mostly used in groceries and department stores. They print faster and quieter than dot matrix. HEADPHONE It is a small speaker with a way to hold them close to the ears of the user. The headphone allows the user to listen music and sounds all alone. DATA PROJECTOR It displays computer information on big screen so that many will able to see the show.

Kids Killing Kids :: Argumentative Persuasive Violence Essays

Kids Killing Kids As you wind down from a long day at the office, you turn on the six o’clock news. The opening story lays out a gruesome attempt to murder, maim, and terrorize children in a city you have never before heard of. Instantly, you are thinking that this must be a review for a soon to be released blockbuster movie. In your mind, nothing like this would ever happen in our civilized world; however, headlines they are. You picture the perpetrators as horrid, evil-minded monsters. What kind of person could commit such a crime against innocent children? As you listen further, your eyes open wide, your heart skips a beat, and you gasp in shock as you discover that these evil-minded monsters you had just envisioned are nothing more than pimple-faced, hormone driven teenagers. Yes, teenagers. As you begin to really absorb the impact of such a crime, you realize that the teenagers that committed this crime are not much older than your own children. Suddenly, you have the uncontrolla ble urge to find your children and hide them from the world. You ask yourself, â€Å"What is wrong with society? What would cause a child to kill anther child? Where were their parents? How could this have happened?† Then, you try to convince yourself that this could never happen in your community. Although fictional, this story is one that is happening in homes all over our country. The real problem is that the crime described above is only one of many that are being committed by our youth. In fact, juvenile crime as a whole is increasing at an alarming rate. It seems that our youth is at war with itself. On a self destructive path that must be altered. How? This is the question at hand. The viewer above asked himself questions that need to be asked, but more importantly they need to be answered. The answers are not as simple as they may seem. The rise in juvenile crime has awakened a heated debate between the liberals and conservatives of our country about the causes, effects, and solutions of such a widespread problem. The liberals argue that this problem can only be fixed through government control; whereas, the conservatives believe the problem can only be fixed at home.

Heart and Cardiac Muscle Essay

What is the heart? The heart is the organ that supplies blood and oxygen to all parts of the body. It is about the size of a clenched fist, weighs about 10.5 ounces and is shaped like a cone. The heart is located in the chest cavity just posterior to the breastbone, between the lungs and superior to the diaphragm. The heart is surrounded by a fluid filled sac called the pericardium. Blood is pumped away from the heart through arteries and returns to the heart through veins. The major artery of the body is the aorta and the major veins of the body are the vena cavae. Chambers of the Heart The heart is divided by a partition or septum into two halves. The halves are in turn divided into chambers. The upper two chambers of the heart are called atria and the lower two chambers are calledventricles. The atria receive blood returning to the heart from the body and the ventricles pump blood from the heart to the body. Valves allow blood to flow in one direction between the chambers of the heart. The Heart Wall The heart is composed of cardiac muscle which enable the heart to contract and allow the synchronization of the heart beat. The heart wall is divided into three layers: the epicardium, myocardium, and endocardium. * Epicardium – outer protective layer of the heart. * Myocardium – muscular middle layer wall of the heart. * Endocardium – inner layer of the heart that is continuous with the inner lining of blood * Cardiac Conduction * Cardiac conduction is the rate at which the heart conducts electrical impulses. Cardiac muscle cells contract spontaneously and are coordinated by nodal tissue, specifically the sinoatrial node. There are other factors that influence heart rate as well. These include endocrine hormones, body temperature and exercise. * Cardiac Cycle * The cardiac cycle is the sequence of events that occur when the heart beats. There are two phases of this cycle which are the diastole and systole phases. During the diastole phase, the atria and ventricles are relaxed and blood flows into the atria and ventricles. In the systole phase, the ventricles contract sending blood to the rest of the body. A heartbeat is a two-part pumping action that takes about a second. As bloodcollects in the upper chambers (the right and left atria), the heart’s natural pacemaker (the SA node) sends out an electrical signal that causes the atria to contract. This contraction pushes blood through the tricuspid and mitral valves into the resting lower chambers (the right and left ventricles). This part of the two-part pumping phase (the longer of the two) is called diastole. The second part of the pumping phase begins when the ventricles are full of blood. The electrical signals from the SA node travel along a pathway of cells to the ventricles, causing them to contract. This is called systole. As the tricuspid and mitral valves shut tight to prevent a back flow of blood, the pulmonary and aortic valves are pushed open. While blood is pushed from the right ventricle into the lungs to pick up oxygen, oxygen-rich blood flows from the left ventricle to the heart and other parts of the body. After blood moves into the pulmonary artery and the aorta, the ventricles relax, and the pulmonary and aortic valves close. The lower pressure in the ventricles causes the tricuspid and mitral valves to open, and the cycle begins again. This series of contractions is repeated over and over again, increasing during times of exertion and decreasing while you are at rest. The heart normally beats about 60 to 80 times a minute when you are at rest, but this can vary. As you get older, your resting heart rate rises. Also, it is usually lower in people who are physically fit. Your heart does not work alone, though. Your brain tracks the conditions around you—climate, stress, and level of physical activity—and adjusts your cardiovascular system to meet those needs. The human heart is a muscle designed to remain strong and reliable for a hundred years or longer. By reducing your risk factors for cardiovascular disease, you may help your heart stay healthy longer.

The Physics Of Mechanical Engineering - 961 Words

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