Experiment No: EM-1 Title: Ohm’s Law‚ Meters‚ Resistivity I Purpose: The basic of simple electrical circuits and measurements is learned. Also‚ investigating the dependence of the resistance of a wire on its length‚ cross-sectional area‚ and the material of which it is made. By examining electrical resistance (R) through a metal conductor‚ the voltage (V) and current (I) through the conductor‚ the following principles will be demonstrated: 1.) Ohm’s Law 2.) Dependence of resistance (R)
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current through that conductor. Electrical resistance shares some conceptual parallels with the mechanical notion of friction. The SI unit of electrical resistance is the ohm (Ω).An object of uniform cross section has a resistance proportional to its resistivity and length and inversely proportional to its cross-sectional area. All materials show some resistance‚ except for superconductors‚ which have a resistance of zero. There are three external factors that influence the resistance in a conductor.
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Aim: To investigate the factors that affect the resistance in a conductor. The main factors that affect the resistance in a conductor are: · Length · Temperature · Cross sectional area · Material · Magnetism The factor that we are going to change is the cross sectional area. Hypothesis: I think that the higher the cross sectional area‚ the lower the resistance in the conductor will be. This is because the Resistance in a metal conductor happens because as the electrons move through the material
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Retrieved 9 October 2014‚ from http://lizastark.com/portfolio/wp-content/uploads/2012/03/Squishy.pdf Squishy Circuits Resistivity. (2014). Retrieved 2 October 2014‚ from http://courseweb.stthomas.edu/apthomas/SquishyCircuits/ResistivityTesting.pdf Walding‚ R.‚ Rapkins‚ G.‚ & Rossiter‚ G. (2004). New century senior physics (1st ed.). South Melbourne: Oxford University Press. Resistivity. (2014). Retrieved 9 October 2014‚ from http://www.princeton.edu/~achaney/tmve/wiki100k/docs/Resistivity.html
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G10 science By Freya Li Practical Investigation Resistance in Wire Aim: To investigate if the length of wire affects its resistance and find out how the resistance changes when the length of wire increases. Hypothesis: My prediction is that as the length of wire increases‚ the resistance will also increase. This is because current is the flow of electrons in a circuit and voltage makes the electrons flow through the circuit. The electrons have to collide with the atoms in the wire‚ which makes
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PROJECT Introduction Title: Investigate one factor that affects the resistance of a wire. Reworded: I am going to investigate if changing the length of a wire changes its resistance. I predict that the longer the wire‚ the more resistance it has. Planning and Preparation Independent Variable: The variable I changed was length (cm). Dependent Variable: The variable I measured was resistance (Ω). Fixed Variables: The variables I kept constant to make it a fair test; were‚ the type of wire (nichrome)
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Ex.No Date Aim: To find resistance of a given wire using metre bridge and hence determine the specific resistance of its material. Apparatus: A meter bridge ‚a Leclanche cell ‚ a galvanometer ‚a resistance box‚ a jockey‚ a resistance wire or resistance coil‚ a metre scale‚ a set square and connecting wires Procedure: 1.Draw the circuit diagram as shown in figure and arrange the apparatus according to the arrangement diagram. 2. Connect the resistance wire or resistance coil whose resistance
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VARIABLES AFFECT RESISTANCE‚ AND WHICH ONE HAS THE GREATEST EFFECT. BACKGROUND INFORMATION: Resistance is the force that opposes the flow of electrons in a circuit. The equation for resistance is Ω=V/A. (Ohms equals Voltage divided by amps). Resistivity is a measure of how strongly a material opposes the flow of electrical current‚ There are four main factors that affect resistance: Length – this is because the electrons would bump into more atoms‚ the longer the wire which is like using up its
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Measuring the Resistivity of Copper Wire of Different Lengths In this report I will be writing about the experiment I will conduct on copper wire of different lengths. The dependent variable I will be measuring is the resistance of the Copper wire. To do this experiment‚ one needs to obtain measurements with a high degree of accuracy‚ taking care of the equipment they use and measuring each value to a certain degree of accuracy for all results. The problem with measuring the resistivity of Copper wire
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calculations. Section 1. The Archie Equation -water saturation as a decimal fraction. -Resistivity of the 100% water saturated rock. -Resistivity of the rock-fluid system. Equation 1.1 was empirically derived by G. E. Archie while working for Shell. This work was reported in in his famous 1942 paper. He plotted SW versus the ratio Rt/Ro (the Resistivity Index) on log-log paper‚ see Figure 1.1. This same technique is still used today to derive a value for n from
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