OHMs prac report Essay Example for Free

OHMs prac report Essay Introduction: OHMS Law states that the current passing through a conductor between two points is directly proportional to the potential difference (i. e. voltage drop or voltage) across the two points, and inversely proportional to the resistance between them. The mathematical equation that describes this relationship is: Independent Variable: changing the resistance (OHMS) Dependant Variable: The current (A) is decreased because of the increasing resistors. Constant: The voltage is kept constant but is changed at the end of each test to make the investigation more accurate. Materials: Method: 1. Collect materials listed in above diagram 2. Set up apparatus shown above 3. Set the voltmeter to 1 volts and place the lead in the 5 OHMs resistor 4. Turn to the Power Pack and record the reading on the ammeter 5. Repeat step 3 and 4 2 more times. 6. Change the volts to 3,5,7,9,11,13 and 15, remembering to only record with the 5 OHMs resistor. 7. Record the results using the 5 OHM resistor 8. Repeat steps 4 7 but instead of using the 5 OHMs resistor, use 10 OHMs, 18 OHMs and 56OHMs resistors 9. Clean up all equipment and analyze the results Results: Current (A) Volts 5 OHMs 10 OHMs 18 OHMs 56 OHMs 1It can be seen from the Graph that as the volts increased and so did the resistors, the current was recorded lower that the previous. The highest current recorded was, 2. 557amps with a resistance of 5 OHMs and a voltage of 15 volts. The lowest current recorded was, 0. 017amps with a resistance of 56 OHMs and a voltage of 1. This shows that as the resistors increased the current was weaker, than of a low resistor at the same voltage. Using the Formula and rearranging the equation so R is the average value for the Resistor can be found. The Formula now would be . The Average resistor value for: The 5 OHMs resistor = 5. 857, The 10 OHMs resistor = 10. 340, the 18 OHMs Resistor = 18. 038 and the 56 OHMs resistor = 56. 238. Discussion: Systematic errors: The resistor not calibrated to the exact value displayed Ammeter not calibrated properly Voltage on battery pack not correctly calibrated properly Random errors: Leaving the resistors on to long causing the resistors to over heat and decrease the resistance. Loss of resistance to the resistors due to ware and tare on the resistors over a long period of time. Damaged equipment. Humidity and room temperature Improvements: There are some possible improvements that could be made to improve the results and practical experiment. The Equipment should be checked prior to the practical to reduce errors during the experiment. Also introducing more accurate results by recording the results ten times, instead of five, and work out the average. Use digital ammeters to measure the current. Compare the results to other practicals that were conducted and compare views and data. The Results: It can be seen from the Graph that as the volts increased and so did the resistors, the current was recorded lower that the previous. The highest current recorded was, 2. 557amps with a resistance of 5 OHMs and a voltage of 15 volts. The lowest current recorded was, 0. 017amps with a resistance of 56 OHMs and a voltage of 1. This shows that as the resistors increased the current was weaker, than of a low resistor at the same voltage. Conclusion: The Hypothesis is correct, as the volts and the resistance was increased, the current decreased. 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.

Little Women by Louisa May Alcott :: essays research papers

Little Women by Louisa Alcott would definitely appeal to women of all types and ages. Little Women appeals to a broad audience, its full of the values and beliefs, and it paints a very real picture of most American’s lives at the time. The reason for this book appealing to such a broad audience lies in all the characters’ personalities. Mrs. March is a strong, independent woman who never falters, therefore she relates to all independent women; but she is also a mother who plants strong values in her girls and is the rock foundation of the family, with that she relates to all mothers. Margaret’s desire for luxury is a desire that we all can relate to and her properness is a trait most girls can relate to. Jo’s mischievous demeanor and talent for writing is something that if one cannot relate, admire to have. Beth is the insecure, sweet, homebody in all of us. Amy represents the beauty and talent, and sometimes moral code, which all women have. Laurie represents all the men that wish to be loved any uncommon-but-beautiful woman. This book is full of the values and beliefs of its time. The March family, that were once-upon-a-time a rich family, were still connected to the â€Å"higher† society. As a result, they were sometimes willingly and sometimes forced to commune with people who looked down on them for being poor. The book taking place during and after the period of the civil war there was a lot of tension concerning Blacks. Some of the values Mrs. March teaches her girls is the importance of never trying to be something there not; the unimportance of material possessions versus mental possessions; and that regardless of what the world told them, they are equal to men and therefore deserve equal rights. The book does a good job of directly and indirectly showing realness of all Americans lives. The whole book feels very real, probably because it’s an autobiography. One very real aspect of the book was the death of Beth. Many loved ones were lost to scarlet fever back then. That particular part of the book, along with being the most real, was the most touching. Despite her being a homebody and living a short life, she had a huge effect on everybody she knew. Another very real feature was the financial struggle of a family of five women and a father away at war at a time when women had no rights.

Driving Mobile Phone

Persuasive Essay Using Cellphones While Driving Mobile Phone use while driving is common, but widely considered dangerous. Due to the number of accidents that are related to cell phone use while driving, some jurisdictions have made the use of a cell phone while driving illegal. I think use of cell phone while driving should be banned at any time, at any age or any circumstances. Cell phones are also a major distraction to the driver, because it not only occupies one's eyes but also one’s attention, which should be appointed on the road and though this causes an accident.Statistics showed that in 2009, 5,474 people were killed in the U. S. because of accidents that involved, distracted driving and another 448,000 were injured. Cell phones cause distraction and horrible accidents which even led to death. It’s obvious that it is rather dangerous to talk on the cell phone or text while driving. That is not only because you put yourself and other people at risk, but the mai n reason, I believe, is because it can ruin anyone’s life in a flash of a second. Using the mobile phone while driving impairs driving behavior worse than being drunk.Those talking on either handheld or hands-free cell phones usually drive slightly more slowly, they are 9 percent slower to hit the brakes when necessary, also showed 24 percent more variation in following distance and 19 percent slower to resume normal speed after braking. An experiment was done by CNBC which gave a reference of each condition showing how far in feet they were delayed. Driving sober without a cell phone in hand was forced to stop randomly without notice, commanded by a red light.Unimpaired took . 54 seconds to brake for a total of 55 feet. Legally drunk (. 08), took about 60 feet to stop, and sending a text took roughly 125 feet to come to a complete stop. Many unpredictable consequences may be caused by careless cell phone users; you can be late to the most important date with your potential s oul-mate or miss the only opportunity to become a millionaire, by being late to the most important business meeting, and you will remain alone and have to toil for rest of your days.

An Overview of the War of 1812