Ohms Law - Voltage and Current relationship

Ohms Law is a key rule for analyzing electrical circuits, describing the relationship between three key physical quantities: voltage, current, and resistance. It represents that the current is proportional to the voltage across two points, with the constant of proportionality being the resistance. Using Ohms Law The relationship defined by Ohms law is generally expressed in three equivalent forms: I VÂ  /Â  RR V / IV IR with these variables defined across a conductor between two points in the following way: I represents the electrical current, in units of amperes. V represents the voltage measured across the conductor in volts, and R represents the resistance of the conductor in ohms. One way to think of this conceptually is that as a current, I, flows across a resistor (or even across a non-perfect conductor, which has some resistance), R, then the current is losing energy. The energy before it crosses the conductor is therefore going to be higher than the energy after it crosses the conductor, and this difference in electrical is represented in the voltage difference, V, across the conductor. The voltage difference and current between two points can be measured, which means that resistance itself is a derived quantity that cannot be directly measured experimentally. However, when we insert some element into a circuit that has a known resistance value, then you are able to use that resistance along with a measured voltage or current to identify the other unknown quantity. History of Ohms Law German physicist and mathematician Georg Simon Ohm (March 16, 1789 - July 6, 1854 C.E.) conducted research in electricity in 1826 and 1827, publishing the results that came to be known as Ohms Law in 1827. He was able to measure the current with a galvanometer, and tried a couple of different set-ups to establish his voltage difference. The first was a voltaic pile, similar to the original batteries created in 1800 by Alessandro Volta. In looking for a more stable voltage source, he later switched to thermocouples, which create a voltage difference based to a temperature difference. What he actually directly measured was that the current was proportional to the temperature difference between the two electrical junctures, but since the voltage difference was directly related to the temperature, this means that the current was proportional to the voltage difference. In simple terms, if you doubled the temperature difference, you doubled the voltage and also doubled the current. (Assuming, of course, that your thermocouple doesnt melt or something. There are practical limits where this would break down.) Ohm wasnt actually the first to have investigated this sort of relationship, despite publishing first. Previous work by British scientist Henry Cavendish (October 10, 1731 - February 24, 1810 C.E.) in the 1780s had resulted in him making comments in his journals that seemed to indicate the same relationship. Without this being published or otherwise communicated to other scientists of his day, Cavendishs results werent known, leaving the opening for Ohm to make the discovery. Thats why this article isnt entitled Cavendishs Law. These results were later published in 1879 by James Clerk Maxwell, but by that point the credit was already established for Ohm. Other Forms of Ohms Law Another way of representing Ohms Law was developed by Gustav Kirchhoff (of Kirchoffs Laws fame), and takes the form of: J ÏÆ'E where these variables stand for: J represents the current density (or electrical current per unit area of cross section) of the material. This is a vector quantity representing a value in a vector field, meaning it contains both a magnitude and a direction.sigma represents the conductivity of the material, which is dependent upon the physical properties of the individual material. The conductivity is the reciprocal of the resistivity of the material. E represents the electric field at that location. It is also a vector field. The original formulation of Ohms Law is basically an idealized model, which doesnt take into account the individual physical variations within the wires or the electric field moving through it. For most basic circuit applications, this simplification is perfectly fine, but when going into more detail, or working with more precise circuitry elements, it may be important to consider how the current relationship is different within different parts of the material, and thats where this more general version of the equation comes into play.

The Effects Of Minority Stress On Mental Health Within The...

Introduction The purpose of this study was to prove how minority stress correlates with mental health within the transgender community. As defined by Meriam-Webster Dictionary, transgender â€Å"is relating to, or being a person who identifies with or expresses a gender identity that differs from the one which corresponds to the person s sex at birth† (Merriam-Webster, 2016). For example, male to female, or female to male. However, researchers in this study used the minority stress model, which suggested that the stress associated with stigma, prejudice, and discrimination will increase rates of psychological distress in the transgender population (Bockting, Miner†¦ Coleman, 2013). As evident from past research, physical violence, verbal harassment and employment discriminations were some of the many types of societal prejudices. In fact, as seen in the article, these stresses create depression, anxiety, and other types of mental illness within the transgender community. However, researcher’s goals were to see exactly how these different variables increased levels of stress. For example, was there negative types of stigma that were less or more server, and what could help to alleviate stress? Review of Literature The article in review is Stigma, Mental Health, and Resilience in an Online Sample of the US Transgender Population. As a diverse group, transgender people can be seen as a movement that is on the rise. Today, more transgender people are stepping out, and expressingShow MoreRelatedLGBT Community and Discrimination.1291 Words   |  6 Pagesâ€Å"Homosexuality† it often conjures up a mental picture of people fighting for their rights, which were unjustly taken away or even the social emergence of gay culture in the world in the1980s and the discovery of AIDS. However, many people do not know that the history of LGBT people stretches as far back in humanity’s history, and continues in this day and age. 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Global Warming AD Free Essays

As the sun’s harmful rays beam through the depleting ozone layer the globe begins to warm, earths polar ice caps melt and slowly start the elimination of life. This ad demonstrates the cause and effect of global warming. The world inside the lower quadrant of the hourglass is slowly getting swallowed by the sea due to the melting ice caps above. We will write a custom essay sample on Global Warming AD or any similar topic only for you Order Now Within the hourglass there’s text stating â€Å"we are slowly running out of time, act now before it’s too late†. In the top of the hour glass a polar bear and penguin sit upon two nearly melted ice caps. The world below has cars driving into a city passed chopped down trees, and a gas station. Although the ad appears to be warning us of global warming, it’s actually warning us of our own selfishness! The ad uses three main tactics to achieve this, presentation of text, types of images, and image composition. The advertisers decided to use presentation of text in a subtle way to get their point across. The display of the text in this ad has diminutive properties. This relates to the feeling human beings have towards the situation of global warming. It indicates that we conveniently believe it’s a small issue and doesn’t need to be presented as a major problem. People avoid the truth and would rather just pass it on to the next generation to deal with. The use of this tactic helps sell the idea that we are to selfish to address the situation. Even though we have scientific evidence that global warming is happening, and that the polar ice caps are melting, people still don’t want to make it an issue. People would rather act selfish and destroy the earth then be inconvenienced and have to give up their comfortable lives. A stronger tactic used by the advertiser is the use of types of images, which provides us with further evidence. The types of images used in this ad show the advertisers point in a more straight forward manner. They use the images of street lights leading up to a city full of high-rises to provide us with the notion that we abuse energy. On the sides of the road there’s chopped down trees and a gas station indicating how human beings rape our land of its natural resources. Cars fill the street showing a luxury that pollutes and destroys the earth. All of which directly correlates with the image of the melting polar ice caps in the top of the hourglass. Once again it sells the idea that the ad informs us of our own selfishness. It indicates that people will do anything for their luxuries, even if it destroys our own planet. Providing evidence that our selfishness will not let anything stand between us and the things we love, even at the highest cost. By using a less noticeable, although stronger tactic, composition of images provides us with further evidence of their strategy. Image composition is the last and strongest tactic used by the advertiser. In the top frame of the hourglass the ice cap sits in pure blue water. In the lower section of the hourglass the earth is being swallowed by stagnant deathly water indicating the lack of life. Plus in the top frame a polar bear and a penguin sit perched anticipating their final moments of life as their worlds slowly melt away. As two birds hover above ground as their world disappears as well. This sells the idea by showing that people are too selfish to care not just about their own lives, but also every other life on this planet. Other creatures are going to die directly caused by our actions. The sea water levels are going to rise while the land becomes engulfed causing life on earth to diminish. And we are too selfish to look around and realize that we are destroying all habitats. Yet we still act like we are alone on this planet. This ad warns us of both global warming and our selfishness as human beings. By combining three tactics, presentation of text, types of images, and image composition the advertisers show us the affects of both. The use of dying animals, abused natural resources, man made cars, and the melting polar ice cap allows us to see the correlation between the issue of global warming and our selfishness. The presentation of text raises the awareness of people thinking it’s not a major situation, thus selling the ideas of global warming and our selfishness towards the belief of global warming. Each involves us in a selfish manner and uses cause and effect to sell the product. If humans keep being selfish and don’t stop taking advantage of our planet, then there will be no planet left to take advantage of. How to cite Global Warming AD, Papers

Global Warming AD Free Essays

As the sun’s harmful rays beam through the depleting ozone layer the globe begins to warm, earths polar ice caps melt and slowly start the elimination of life. This ad demonstrates the cause and effect of global warming. The world inside the lower quadrant of the hourglass is slowly getting swallowed by the sea due to the melting ice caps above. We will write a custom essay sample on Global Warming AD or any similar topic only for you Order Now Within the hourglass there’s text stating â€Å"we are slowly running out of time, act now before it’s too late†. In the top of the hour glass a polar bear and penguin sit upon two nearly melted ice caps. The world below has cars driving into a city passed chopped down trees, and a gas station. Although the ad appears to be warning us of global warming, it’s actually warning us of our own selfishness! The ad uses three main tactics to achieve this, presentation of text, types of images, and image composition. The advertisers decided to use presentation of text in a subtle way to get their point across. The display of the text in this ad has diminutive properties. This relates to the feeling human beings have towards the situation of global warming. It indicates that we conveniently believe it’s a small issue and doesn’t need to be presented as a major problem. People avoid the truth and would rather just pass it on to the next generation to deal with. The use of this tactic helps sell the idea that we are to selfish to address the situation. Even though we have scientific evidence that global warming is happening, and that the polar ice caps are melting, people still don’t want to make it an issue. People would rather act selfish and destroy the earth then be inconvenienced and have to give up their comfortable lives. A stronger tactic used by the advertiser is the use of types of images, which provides us with further evidence. The types of images used in this ad show the advertisers point in a more straight forward manner. They use the images of street lights leading up to a city full of high-rises to provide us with the notion that we abuse energy. On the sides of the road there’s chopped down trees and a gas station indicating how human beings rape our land of its natural resources. Cars fill the street showing a luxury that pollutes and destroys the earth. All of which directly correlates with the image of the melting polar ice caps in the top of the hourglass. Once again it sells the idea that the ad informs us of our own selfishness. It indicates that people will do anything for their luxuries, even if it destroys our own planet. Providing evidence that our selfishness will not let anything stand between us and the things we love, even at the highest cost. By using a less noticeable, although stronger tactic, composition of images provides us with further evidence of their strategy. Image composition is the last and strongest tactic used by the advertiser. In the top frame of the hourglass the ice cap sits in pure blue water. In the lower section of the hourglass the earth is being swallowed by stagnant deathly water indicating the lack of life. Plus in the top frame a polar bear and a penguin sit perched anticipating their final moments of life as their worlds slowly melt away. As two birds hover above ground as their world disappears as well. This sells the idea by showing that people are too selfish to care not just about their own lives, but also every other life on this planet. Other creatures are going to die directly caused by our actions. The sea water levels are going to rise while the land becomes engulfed causing life on earth to diminish. And we are too selfish to look around and realize that we are destroying all habitats. Yet we still act like we are alone on this planet. This ad warns us of both global warming and our selfishness as human beings. By combining three tactics, presentation of text, types of images, and image composition the advertisers show us the affects of both. The use of dying animals, abused natural resources, man made cars, and the melting polar ice cap allows us to see the correlation between the issue of global warming and our selfishness. The presentation of text raises the awareness of people thinking it’s not a major situation, thus selling the ideas of global warming and our selfishness towards the belief of global warming. Each involves us in a selfish manner and uses cause and effect to sell the product. If humans keep being selfish and don’t stop taking advantage of our planet, then there will be no planet left to take advantage of. How to cite Global Warming AD, Papers