# Physics coursework resistance of a wire safety

**Resistance of a wire - physics**

Physics coursework - resistance plan what affects the resistance of a piece of wire? There are many variables in this investigation.

It considers that there are electrons on the outer shell of a metal are free to move at random. Background knowledge to make current flow through a conductor, there must be a potential difference (voltage) across it. This question does exactly that demonstrate how to predict voltage sag for a loaded voltage divider in such a way that is much easier than using ohms law and kirchhoffs laws directly. The equation to measure resistance is resistance voltage current r v i resistance is measures in volts per amps or, more commonly, ohms (î). Papers - the resistance of a wire aim to investigate how the length of the wire affects the resistance of a wire.

Show how this could be done, then complete the table of sensor supply voltages shown above. Scientific background electricity is conducted through a conductor, in this case a wire, by means of free electrons. And, if we know the plot will be a straight line, all we need in order to plot a complete load line are usually, the easiest data points to gather for a circuit - whether it be a real circuit or an hypothetical circuit existing on paper only - is the condition. For the first experiment i shall use an ammeter to measure the current through the wire in current and a voltmeter to find the voltage across the wire. The assumption of linearity allows us to define the load line for each power source from just these two data points.

Papers - resistance of a wire investigation aim the aim of this experiment is to explore the effects of resistance that travels through a constantan wire when induced with an electric current. Ask your students how they would apply this technique to an abstract circuit problem, to reduce a complex network of sources and resistances to a single current source and single parallel resistance (norton equivalent). Explain how we could experimentally determine the optimum internal resistance of the electrolysis cell, prior to actually building it, using nothing but the solar panel, a rheostat, and a dmm (digital multimeter). Papers - resistance of a wire aim which factors affect the resistance of a wire. To this end, instructors usually provide their students with lots of practice problems to work through, and provide answers for students to check their work against. The point of all this, of course, is for students to see that a constant voltage source has zero internal resistance and that a constant current source has infinite internal resistance. Finally, draw an equivalent circuit showing an ideal current source somehow connected to a resistance in such a way that its open-circuited output voltage is identical to the practical current source. They also need real, hands-on practice building circuits and using test equipment. Hint it only takes two points to define a line! Hint the easiest points on find on this load line are the points representing open-circuit and short-circuit conditions (i. Ac clamp-on meters are simpler, cheaper, and thus more popularly known, but devices using the hall effect are capable of inferring dc current by the strength of an unchanging magnetic field, and these hall-effect devices are available at modest expense.

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The atom is made up of protons in which is made up of fundamental partial called quarks so the proton have three quarks and they are two going up and one going down and neutrons is also made up of quarks but arranged in a the opposite way they have two going down and one going up. In other words, explain how we would know just from the limited data of v that these two power sources will behave exactly the same when connected to the same load resistance, whatever that load resistance may be. The current in the metal wire is carried by electrons. Dma digital-to-analog conversion with a sam4s microcontroller the timercounter part one in this three-article series focuses on using the sam4s timercounter peripheral to precisely control the dacs sampling rate. Another symbol is two intersecting circles, with an arrow nearby pointing in the direction of conventional flow predict how an ideal current source would behave for the following two load scenarios follow-up question identify the polarity of the voltage drops across the resistors in the circuits shown above.

These collisions slow down the flow of electrons causing resistance. Electric current will only flow if there are charges, which can freely move. In a longer piece of wire, there would be more atoms for the electrons to collide with and so the resistance would be greater. I also believe that the rate at which the resistance of the wire increases will be directly proportional to the length. Give a step-by-step procedure for reducing this circuit to a norton equivalent circuit (one current source in parallel with one resistor) i will let you research the procedure for determining norton equivalent circuits, and explain it in your own words.

It is important to have a fair test, so the cross-sectional area of the wire must be the same for all measurements because as the cross-sectional area increase the resistance decrease. Material the type of material will effect the number of free electrons, which are able to flow through the wire. Follow-up question 1 explain why wire resistance alone does not explain the modest short-circuit current. In my hypothesis, i predicted that the effect of changing the wire length will be that as the length increases, the resistance on the wire will increase. Papers - resistance of a wire investigation resistance is to do with how easy it is for the electric current to flow through a material, e. So if we double the length of a wire, the number of atoms in the wire doubles, so the number of jumps double, so twice the amount of energy is required there are twice as many jumps if the wire is twice as long. That is, instead of r (v)(i) we should have r dvdi. Inside this box, you were told, was a voltage source (an ideal voltage source connected in series with a resistance) how would you experimentally determine the voltage of the ideal voltage source inside this box, and how would you experimentally determine the resistance of the series resistor? By experimentally, i mean determine voltage and resistance using actual test equipment rather than assuming certain component values (remember, this black box is sealed, so you cannot look inside!). Input variable i am going to experiment with the length of the wire and see how that can change the resistance. Now, i am going to tell you what are the factors of wire resistance.

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