Conductivity and Conductive Elements

Conductivity and Conductive Elements Conductivity refers to the ability of a material to transmit energy. There are different types of conductivity, including electrical, thermal, and acoustical conductivity.  The most electrically conductive  element is silver, followed by copper and gold. Silver also has the highest thermal conductivity of any element and the highest light reflectance. Although it is the best conductor, copper and gold are used more often in electrical applications because copper is less expensive and gold has a much higher corrosion resistance. Because silver tarnishes, it is less desirable for high frequencies because the exterior surface becomes less conductive. As to why silver is the best conductor, the answer is that its electrons are freer to move than those of the other elements. This has to do with its valence and crystal structure. Most metals conduct electricity. Other elements with high electrical conductivity, are aluminum, zinc, nickel, iron, and platinum. Brass and bronze are electrically conductive alloys, rather than elements. Table of the Conductive Order of Metals This list of electric conductivity includes alloys as well as pure elements. Because the size and shape of a substance affect its conductivity, the list assumes all samples are the same size. In order of most conductive to least conductive: SilverCopperGoldAluminumZincNickelBrassBronzeIronPlatinumCarbon SteelLeadStainless Steel Factors That Affect Electrical Conductivity Certain factors can affect how well a material conducts electricity. Temperature: Changing temperature of silver or any other conductor alters its conductivity. In general, increasing the temperature causes thermal excitation of the atoms and decreases conductivity while increasing resistivity. The relationship is linear, but it breaks down at low temperatures.Impurities: Adding an impurity to a conductor decreases its conductivity. For example, sterling silver is not as good of a conductor as pure silver. Oxidized silver is not as good a conductor as untarnished silver. Impurities hinder electron flow.Crystal structure and phases: If there are different phases of a material, conductivity will slow slightly at the interface and may be different from one structure than another. The way a material has been processed can affect how well it conducts electricity.Electromagnetic fields: Conductors generate their own electromagnetic fields when electricity runs through them, with the magnetic field perpendicular to the electric field. External electromagneti c fields can produce magnetoresistance, which can slow the flow of current. Frequency: The number of oscillation cycles an alternating electrical current completes per second is its frequency in Hertz. Above a certain level, a high frequency can cause current to flow around a conductor rather than through it (skin effect). Since there is no oscillation and hence no frequency, the skin effect does not occur with direct current.

The List of the Most Persuasive Speech Topics that Are Relevant for 2018 How to Choose the Best Topic

The List of the Most Persuasive Speech Topics that Are Relevant for 2018 How to Choose the Best Topic The List of the Most Persuasive Speech Topics that Are Relevant for 2018: How to Choose the Best Topic At college or university, there are a lot of new things to learn but the time is usually limited for students. No wonder most of them struggle when they are asked to write a persuasive speech as they need to dispose an audience to their views. The most challenging part is not the actual writing but rather choosing speech topics that can be considered as persuasive and one that you can do justice to while presenting before the audience. What to Consider When Selecting a Persuasive Speech Topic? Your interest in a topic. It is impossible to entice your audience, more importantly to persuade the others if a topic doesn’t interest you. With a topic you are interested in you will use the right words. According to Joseph Conrad, those who want to persuade should put trust not in the right argument, but in the right word. The topic knowledge. How can you convince people to believe your arguments that you have no idea about? When choosing a topic for a persuasive speech, make sure it includes something that you are well conversant with. If the topic has already been selected for you by an examiner, then you should take enough time for research. Write down the key points and ideas on a scratch paper before you can even begin writing the speech. This will help consolidate your ideas and you will have a smooth task when it comes to the actual writing and public speaking. The targeted audience. The listeners whom you’re going to deliver your speech have an influence on the kind of persuasive speech topics you choose. The audience also determines the kind of vocabulary you use. It is not logical to use medical terms when writing a speech addressing farmers. What Are Persuasive Speech Topics Actual in 2018? Among various categories this list contains the key issues in 2018. It’s up to you what speech topic you select. Keep in mind all those points mentioned above are essential while considering a topic for speaking. Indeed, there are many resources for looking up the necessary information. But you’ll find a relevant and useful source below as well. Climate Change. To be more aware of the following topics, see the speech by the president of America, Barack Obama, given at the Copenhagen Conference. - How Real is Global Warming in the 21st Century?; - The Best Solution to the Global Problems in Climate. Health. Search Medical Research Council to be provided with the data on the topics: - Contraceptives and Their Role in the Society; - How Effective is Plastic Surgery and Can Humans Do Away With it? Society. Find the Brookings Institute useful to get new ideas for solving problems facing society at all levels. - People in the LGBT Community: Their Role in the Society?; - University Freedom and the Increased Immorality Among Students. Law. Consult at Legal Information Institute to find out more information on the topics: - Should Prostitution be Legalized in the Modern World?; - Drug Abuse among the Youths: What Measures Should Be Taken by the Government? Military. Open the site Military1.com to be familiar with the following topics: - Should Nuclear Weapons Be Banned to Prevent the 3rd World War?; - What Honors and Awards Contribute to a Soldier Inspiration to Protect a State? How to Make Your Speech Persuasive? The best way to make your speech persuasive is to keep the audience engaged by giving interesting facts on a topic and react to their response during a speech. Stay calm and confident to really impress your listeners. With the right topic, you will find yourself persuasive. You are lucky to have a list of the most persuasive speech topics actual for the year 2018 to excite the curiosity of the audience. Writing a persuasive speech is actually very easy if you resort to our professional persuasive speech writing service provided by our company.