Investigating The Factors Which Affect The Resista Essays

Investigating The Factors Which Affect The Resista Essays Investigating The Factors Which Affect The Resistance Of A Piece Of Putty resistance Of a piece of resistance putty Planning: This investigation is designed to look into the resistance of different materials, in this case, resistance putty in the form of wires, and their conducting capability in different shapes. We must bear in mind though that different thickness and length of the putty used to make up the wire itself will affect the electric conduction capability. Therefore, the factors are; The thickness of the putty e.g. 1mm, 2mm, 3mm in diameter or 1 cm in diameter And also The length of the putty e.g.25cm, 50cm, 75cm long. The experiment will require both the readings of voltage and current in order to produce the value of resistance according to the formula; R= V/ I The current flowing through the wire will be recorded to the nearest 0.01A, using an ammeter placed in series with the circuit. The voltage across the putty will also be measured and recorded to the nearest 0.01V, using a voltmeter placed parallel across the putty. To make it a fair test, the cell terminals will be reversed after the first readings, so that the current would flow in the opposite direction, and then be recorded down again to give repeat readings. The 2 readings for (I) or current will then be averaged, and the 2 readings for (V) or voltage will also be averaged. So that I could calculate the resistance by using the formula: R=V / I (resistance = voltage/current) or (resistance potential difference across the wire/current through the wire) The putty will be 20cm long. Making sure that this is a fair test and experiment, the putty will have a diameter of a one-penny coin at all times. We use the one penny coin, because it will keep the putty even, and so that the crocodile clips which will be placed at each end of the putty wont squash the ends of the putty. The experiment will be repeated 10 times altogether, shorting the wire 2cm each time, to give a range of 20cm to 2cm. Safety precautions: Make sure that the circuit is properly connected before turning the power supply on, and do not touch the apparatus, especially the tested wire, in case the putty, until the power is switched off. The changing of the putty should only occur when the power is off. Do not carry out the experiment in wet areas, as water is a very good conductor. Do not switch on the power pack when there is no resistant wire (putty) and do not turn the power supply up too high, because normal laboratory wires may melt, and so might the putty. Do not handle experiment with wet hands. Place asbestos mat underneath putty for safety. Place a variable resistor in the circuit for safety to ensure that the current did not remain too large, but remained set at the same value throughout the experiment to ensure that the test was fair. Prediction: The factor I am investigating for this experiment is the length. The length will change throughout the experiment but not the area. I predict that when the length of the putty increases, so wills the resistance. I also think that the length of the putty will be directly proportional to the resistance of the putty, which means that there will be a direct relationship. So, overall, when the length of the putty gets bigger the resistance will get bigger too. Theory: I chose my prediction because; longer wires will cause an increase in resistance, because the electrons have to travel past more atoms and collisions than they do in shorter wires, in this case the putty. This means that it will take a longer time for electrons to past through a long piece of putty than a short piece of putty, and that is why there will be a big value in resistance. (The longer the putty the bigger the resistance). Also, long thin putty has more resistance than a short thick one of the same material. Also, Ohms law states that for a wire under constant physical conditions, the current is proportional to the voltage. This is also equivalent to stating that resistance is constant. If the current through a conductor is I when the

Take these things off your resume ASAP

Take these things off your resume ASAP We’re not telling you anything you don’t know when we say that today’s job market is intense- across industries and professions, every job opening is met with a rush of talented and qualified applicants from around the country, all vying for the same spot. With hundreds (if not more) people applying for open positions, you better be sure that every aspect of your job-hunting game is razor sharp- including your resume. If you’re sending out resumes with any of the following things on them, stop what you’re doing and make some changes- fast.Salary requirements or historyUnless you’re responding to a job ad that specifically asks for your salary history and requirements (and if it does, include it in your cover letter, not your resume), save the salary talk for the negotiation once a job offer has been made. Your first impression and your resume should be all about what you can offer a prospective employer, not what you require from them.Persona l social media linksYes, you’re a person and it’s okay for prospective employers to be aware of this, but save your limited resume real estate for professional accomplishments and experience. In fact, it’s much more likely that there are things on your social media pages that could dissuade potential employers from hiring you than convince them that you’re the perfect person for the job.â€Å"Creative† fonts and imagesSure, it makes sense that you want to stand out from the job-hunting crowd and make a lasting impression on prospective employers, but using a wacky, magenta-colored font or embedding photos of you and your dog won’t bring you the kind of attention you’re looking for. Hiring managers are busy people with limited time, and won’t sift through a maze of creative flourishes to get to the heart of your resume and figure out if you have what it takes to handle the job. Help them by making your resume as professional and easy-to-follow as possible.A boilerplate objective statementA generic, boilerplate objective statement is typically a waste of space on your resume, as it likely just repeats the messaging you have in your cover letter, and often is full of tired clichà ©s (more on that later). Besides, hiring personnel know that your primary objective is to get this particular job, or you wouldn’t be applying for it.Outdated skillsAre you proud of your WordPerfect wizardry or your ability to operate a fax machine? That’s great, but keep it to yourself- shining a light on your mastery of outdated office technology will not only fail to impress potential employers, it will make you seem out of date. Also, don’t bother talking about your skills with obvious office tools like Microsoft Word, telephones, or email. In today’s job market, your ability to navigate basic office technology is a given, not a bonus.Resume clichà ©sAre you a â€Å"team player,† your officeà ¢â‚¬â„¢s â€Å"go-to person,† or a â€Å"passionate self-starter†? While these may all be true, these tired and worn phrases come off as weak and meaningless on resumes- they’re simply overused, generic clichà ©s that have long since lost their ability to impress hiring personnel and make you stand out from the crowd. Save your bullet points for targeted, measurable, results-driven facts that drive home your perceived value as a prospective employee.TyposThis one seems obvious, right? Well, you’d be surprised by how many people think that too, and then send out resumes with glaring typos on them. A nationwide survey released by CareerBuilder  found that 58% of resumes received by those polled had typos. Sloppiness is not a good way to introduce yourself to prospective employers!After crafting your resume until it’s just right, be sure to check it carefully for errors- and then check it again. Better still, have someone you trust review it as wel l. Only when you’re absolutely, positively sure that your resume is free from typos and mistakes should you even think about sending it out.Along with your cover letter, your resume is going to serve as your first impression, so there’s simply no room for error. Make sure that the things mentioned here are as far from your resume as possible, and you’ll be sure to make a better impression on hiring managers and prospective employers.