How Does Static Electricity Work

Have you ever gotten a shock from touching a doorknob, or seen your hair get frizzy on particularly cold, dry days? If you’ve had any of these experiences, youve encountered static electricity. Static electricity is the buildup of electric charge (positive or negative) in one location. Its also called â€Å"electricity at rest.† Key Takeaways: Static Electricity Static electricity occurs when charge builds up in one place. Objects typically have an overall charge of zero, so accumulating a charge requires the transfer of electrons from one object to another. There are several ways to transfer electrons and thus build up a charge: friction (the triboelectric effect), conduction, and induction. The Causes of Static Electricity An electrical charge—defined as either positive or negative—is a property of matter that causes two electrical charges to attract or repel. When two electrical charges are of the same kind (both positive or both negative), they will repel one another. When they are different (one positive and one negative), they will attract. Static electricity occurs when charge builds up in one place. Typically, objects are neither positively or negatively charged—they experience an overall charge of zero. Accumulating a charge requires the transfer of electrons from one object to another. Removing negatively charged electrons from a surface will cause that surface to become positively charged, while adding electrons to a surface will cause that surface to become negatively charged. Thus, if electrons are transferred from Object A to Object B, Object A will become positively charged and Object B will become negatively charged. Charging by Friction (Triboelectric Effect) The triboelectric effect refers to the transfer of charge (electrons) from one object to another when they are rubbed together, via friction. For example, the triboelectric effect may occur when you shuffle across a carpet wearing socks during the winter. The triboelectric effect tends to occur when both objects are electrically insulating, meaning electrons cannot freely flow. When the two objects are rubbed together and then separated, the surface of one object has gained a positive charge, while the surface of the other object has gained a negative charge. The charge of the two objects after separation can be predicted from the triboelectric series, which lists materials in the order in which they are prone to become positively or negatively charged. Because electrons cannot freely move, the two surfaces can remain charged for a long time, unless they are exposed to an electrically conducting material. If an electrically conducting material like metal is touched to the charged surfaces, the electrons will be able to move freely, and the charge from the surface will be removed. This is why adding water to hair that is frizzing due to static electricity will remove the static. Water containing dissolved ions—as is the case with tap water or rainwater—is electrically conducting and will remove the charges that have accumulated on hair. Charging by Conduction and Induction Conduction refers to the transfer of electrons when objects are placed in contact with one another. For example, a surface that is positively charged can gain electrons when it touches a neutrally charged object, causing the second object to become positively charged and the first object to become less positively charged than it previously was. Induction does not involve a transfer of electrons, nor does it involve direct contact. Rather, it uses the principle that like charges repel and opposite charges attract. Induction occurs with two electrical conductors, because they allow charges to move freely. Here is an example of charging by induction. Imagine that two metal objects, A and B, are placed in contact with one another. A negatively charged object is placed to the left of Object A, which repels the electrons on the left side of Object A and causes them to move to Object B. The two objects are then separated, and the charge redistributes itself over the entire object, leaving Object A positively charged and Object B negatively charged overall. Sources Beaver, John B., and Don Powers. Electricity and Magnetism: Static Electricity, Current Electricity, and Magnets. Mark Twain Media, 2010.Christopoulos, Christos. Principles and Techniques of Electromagnetic Compatibility. CRC Press, 2007.Vasilescu, Gabriel. Electronic Noise and Interfering Signals Principles and Applications. Springer, 2005.

The Six Stages Of Critical Thinking - 947 Words

Introduction We will be discussing the six stages of critical thinking presented by Paul and Elder. We will be exploring each stage to gain a better understanding of how each stage works towards becoming a better critical thinker. We will commence self observation of ourselves and see what stage we consider ourselves to be currently at. Finally, we will set a long term goal and generate a plan to obtain that goal of becoming a overall better critical thinker. Unreflective Thinker The unreflective thinker does not stop and observe their thoughts or how those thoughts affect there actions or beliefs (Paul Elder, Critical Thinking in Everyday Life: 9 Strategies, 2001; Paul Elder, Critical Thinking Development: A Stage Theory, 2001). The unreflective thinker is also lacks the knowledge that he/she has problems in there thinking (Paul Elder, Critical Thinking Development: A Stage Theory, 2001). Unreflective thinkers tend to have some skills unknowingly but these skills had been picked up during challenging times while not aware and are not orchestrated in any manner (Paul Elder, Critical Thinking in Everyday Life: 9 Strategies, 2001) The Challenged Thinker starts to recognize that there is existing problems with his or her thinking (Paul Elder, Critical Thinking in Everyday Life: 9 Strategies, 2001). This thinker starts to notice these issues by conductive self reflection and deep thought (Paul Elder, Critical Thinking Development: A Stage Theory, 2001). 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The Positive Effects of Technology on Education Free Essays

One of the greatest areas in which technology has the potential to benefit education is its role in being a catalyst for change in educational pedagogy. Research shows that student centered, constructivist approaches to education lead to better achievement in testing and preparing students with the skills necessary in the modern workplace. A study done in Turkey found that students who learned in a classroom showed greater cooperation and collaboration, higher levels of learning, more confidence, and more willingness to participate in learning activities (Erdamar, 2008). We will write a custom essay sample on The Positive Effects of Technology on Education or any similar topic only for you Order Now Other studies have found that student centered learning leads to better performance on tests and better retention of knowledge immediately after learning as well as 30 days after learning (Karaduman, 2002). Future workplace will require students to have skills related to technology, including the technical ability. These technical skills are not enough. Today’s workplace requires that one has less tangible skills, including the ability to collaborate, interpersonal skills, creativity, and problem solving skills, to name a few. Technology, combined with a student centered, constructivist mode of learning, has the potential to provide students with higher-level cognitive and interpersonal skills (Koller, Harvey ; Magnotta, 2001). Scholastic and the Bill ; Melinda Gates Foundation (2012) found that teachers need more tangible learning resources such as instructional materials workbooks, technology, software programs, textbooks, and mixed media. Teachers say also that they need support to help them learn best practices and strategies for differentiation of instruction to address individual student learning needs. They want to learn teaching practices that instruct and engage students in the best possible ways. Lastly, teachers say that professional learning has a strong or very strong impact on student achievement (Killion, 2012). Technology does not revolutionize education, but rather the way in which it is used by teachers and students. Seemingly, it is not advisable to change current classroom practices of teachers abruptly without giving enough time to get used to the presence and utilization of technology as an instructional aid. For teachers to adopt technology as an instructional aid, they need to experience some degree of success with it. The experience will motivate them to make further and more effective instructional use. Transition from non-computer based instruction to an engaging computer-based learning environment should be gradual, smooth and well-planned. Subsequent training conducted in a timely fashion and support available, teachers will be able to make increasing instructional use of computers in the classroom (Jhurree, 2008). How to cite The Positive Effects of Technology on Education, Papers