Summary of WeVe Got Mail Always Essay Example

Summary of WeVe Got Mail Always Paper Email has become so entrenched in our lives that it has become the common mode of communication in the workplace, and for some, it has become a lifeline to the world as well. Many of us can hardly imagine life without it. That email enhances as well as complicates our daily business is a given. In Weve Got Mail—Always, Andrew Leonard discusses how email saves time and wastes it, makes life simpler and more complicated, brings us together and pushes us apart. (240-243) E-mail, cant live with it, cant live without it. Con artists and real artists, advertisers and freedom fighters, lovers and sworn enemiestheyve all flocked to e-mail as they would to any new medium of expression. E-mail is convenient, saves time, brings us closer to one another, helps us manage our ever-more-complex lives. Books are written, campaigns conducted, crimes committedall via e-mail. But it is also inconvenient, wastes our time, isolates us in front of our computers and introduces more complexity into our already too-harried lives. To skeptics, e-mail is just the latest chapter in the evolving history of human communication. A snooping husband now discovers his wifes affair by reading her private e-mailbut he could have uncovered the same sin by finding letters a generation ago. Yet e-mailand all online communicationis in fact something truly different; it captures the essence of life at the close of the 20th century with an authority that few other products of digital technology can claim. Does the pace of life seem ever faster? E-mail simultaneously allows us to cope with that acceleration and contributes to it. We will write a custom essay sample on Summary of WeVe Got Mail Always specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on Summary of WeVe Got Mail Always specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on Summary of WeVe Got Mail Always specifically for you FOR ONLY $16.38 $13.9/page Hire Writer Are our attention spans shriveling under barrages of new, improved forms of stimulation? The quick and dirty e-mail is made to order for those whose ability to concentrate is measured in nanoseconds. If we accept that the creation of the globe-spanning Internet is one of the most important technological innovations of the last half of this century, then we must give e-mailthe living embodiment of human connection across the Netpride of place. The way we interact with each other is changing; e-mail is both the catalyst and the instrument of that change.

The resistivity of Constantan Essays

The resistivity of Constantan Essays The resistivity of Constantan Paper The resistivity of Constantan Paper The resistance of a piece of wire is dependant on its length, cross-sectional area and the type of metal the wire is made of. The resistance of a given wire can be calculated using the following equation: R = ? L / A where: L = Length (m) A = cross-sectional area (mi ) ? = resistivity of the metal By rearranging the equation the resistivity of the metal can be calculated: ? = R A / L The resistivity differs depending on the metal however it is constant at room temperature for each metal. This means that two pieces of wire made of the same metal and at room temperature should give the same result when calculating resistivity regardless of its length and cross-sectional area. The following equation can be used to calculate the resistance of a wire: R = V / I where: V = volts I = amps R = resistance When rearranged it can be compared with the equation of a straight line graph: V = R I y = m x (where m = the gradient) This means a graph plotted with volts against amps, the gradient of the graph will equal the resistance of the wire and from this the resistivity can be calculated. Constantan was chosen as unlike most metals, its resistivity does not change when the temperature is raised so the results will not be affected by the wire heating up. Method and apparatus Take two lengths of constantan wire, one 34 SWG (standard wire gage) and the second 30 SWG. Measure the diameter of each wire using a micrometer and then measure their lengths in metres. Set up the apparatus as shown in fig. 1 using the 30 SWG wire first and ensuring the power pack is on direct current. Using the rheostat alter the number of volts running through the circuit until approximately 3 amps is reached. Note the voltage and ensure the scale of volts used does not exceed this as the wire will get too hot. Use the rheostat to change the voltage to the first on your scale and note the amps. Repeat this until six readings have been taken. Set up the apparatus with the 34 SWG wire and repeat experiment. Plot a graph for each wire and calculate the resistivity of the constantan, both wires should give the same result. In the interest of safety all electrical appliances should be regularly checked. It is also important that the wire is not handled while in use in the experiment as it may heat up. To ensure little error the crocodile clips should be at the very end of the wire as the length is a factor in the calculation. If the wire curls onto itself and is touching at any point then this will affect the results as it will shorten the length of the wire the current must travel through. Apparatus: Ruler Voltmeter Micrometer Wires Rheostat Crocodile clips Power pack Amp meter Fig. 1 Results 30 SWG 34 SWG Volts i 0. 1 Amps i 0. 01 Volts i 0. 1 Amps i Discussion The resistivity of the two wires should have given the same result as they were both made from constantan, however the wires gave two different results. The 30 S. W. G. wire gave a result of 5. 49 x 10 ? m whereas the 34 S. W. G. wire gave a result of 4. 62 x 10 ? m. Although both wires gave a relatively close result to the expected value of 5. 49 x 10 ? m when tested, it does suggest some error was made. It was noted that all the experimenters present found they calculated a lower value for the 30 S. W. G. wire than that of the 34 S. W. G. wire. This may mean that the properties of the two wires differ slightly, perhaps because of a difference in the company that produced it or a different batch. The equipment used was limited as to how accurate the readings could be with the accuracy being i 0. 01 for the ammeter and only i 0. 1 for the voltmeter. This may have affected the results and could account for why the graph for the 34 S. W. G. wire did not form a straight line and so a line of best fit had to be drawn. The graph for the 30 S. W. G. did form a straight line as expected so perhaps there was less error in the testing on this wire. If the experiment was to be repeated, a more accurate voltmeter and ammeter should ideally be used. It may also be beneficial to use wires that come from the same batch and company to ensure this is not a factor affecting the results. Bibliography Kaye and Laby (1995) Physical and Chemical Constants 16th Ed : Longman Carol Slack Show preview only The above preview is unformatted text This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.