Quality of measurement Write Up Wire Wire This diagram shows how we carried out our experiment‚ by connecting 2 wires to the ohmmeter and attached the wires to the samples we used in our experiment. Preliminary Experiment At first in our preliminary experiment my group and me decided to use an ohmmeter instead of a multimeter. We did this as we thought it would make it easier for us to record our results. These are the results we got from our preliminary experiment: Length (mm)
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prepared samples increases with the Pr content. These results are in good agreement with XRD data.Simila results have been reported in literature for RE substituted spinel ferrites [21‚ 22]. 3.3. Electrical resistivity measurements The
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Batteries‚ Resistance and Current “Battery-Resistor”: Check “show battery” and “show cores”‚ watch what happens‚ adjust some variables 1. Why do electrons (blue dots) move? Draw a diagram of the battery‚ label the flow of electrons. The flow of current (+) is opposite; draw this and note if toward or away from + terminal of the battery. The blue dots indicating the electrons move because there is a voltage across the battery in which the electrons flow away from the positive terminal
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“Resistance and Electric Circuit” Lab was to determine the resistivity of a conducting wire given two known resistors. The main property of resistivity is that it represents how easily electrons can flow through a material. A Galvanometer is used to measure the current of the circuit and the Wheatstone Bridge is used to measure the resistances and determine the unknown resistance. This experiment also relates Ohm’s Law to determine the resistivity using the resistance of the wire‚ length of the wire‚
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1. INTRODUCTION Concrete is a widely used building material‚ many concrete pavements such as bridge deck‚ highway pavements and airfield runways are constructed all over the world‚ due to its superior properties such as high strength‚ good stability‚ abrasion resistance and anti-slippage. However‚ concrete is a poor electrical conductor‚ especially under dry conditions. Concrete that is excellent in both mechanical and electrical conductivity properties may have important applications in the electrical
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is to describe the size of the change in the resistivity in the order of 10% to 20%‚ considered to be enormous compared to the response of other magnetic sensors in the presence of an external magnetic field. Let us proceed with a historical overview‚ beginning from the original perception of the idea up to the creation of the first GMR materials. In 1936‚ Sir Neville Francis Mott first observed and explained the sudden increase of the resistivity in ferromagnetic metals when they are heated above
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The electrical resistivity of a metal arises from the interactions of the conduction electrons with impurities‚ defects and the vibrating ions of the lattice. As the temperature is lowered‚ the amplitudes of the lattice vibrations diminish‚ so one would expect the resistivity also to decrease gradually toward a small‚ but finite‚ value determined by the impurities and defects. This behavior is manifested by many materials. In 1911 H. Kamerlingh Onnes discovered that as the temperature of mercury
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measure physical phenomena: • Gravity • Magnetism • Elastic waves • Electricity • Electromagnetic waves Which are sensitive to sub-surface physical properties: • Density • Magnetic susceptibility • Seismic wave velocity and density • Resistivity • Conductance/inductance/permitivity Oh‚ and it’s relatively cheap Applied geophysics – Introduction Active and passive Active Transmit a signal into the subsurface and record what comes back • Seismic arrival – explosions • Electrical current
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accelerators. In lab YBa2Cu3O7‚ a type II superconductor‚ was fabricated. A powder x-ray diffraction was carried out on the sample to verify the chemical makeup and identify any impurities. Two thin rods of the sample were also used to measure the resistivity verses temperature and the Meissner effect. Procedure: To begin‚ a 2 gram sample of YBa2Cu3O7 was fabricated. This involved mixing‚ mortaring‚ and sintering of Y2O3‚ BaCO3‚ and CuO powders. Prior to mixing the powders‚ the correct stoichiometric
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difference V I V = IR (R = resistance) Unit (R) 1 1V 1A (Ohm) Factors on which resistance depends 1. 2. R R l‚ when A and material constant l = length A‚ when l and material constant A = perpendicular cross-section R R l A l A ( = resistivity) Unit ( ) m Resistance in a series connection R = R1 + R2 + R3 + … + Rn Resistance in parallel 1 R 1 R1 1 R2 ... 1 Rn Heating Effect of current Electric energy = VIt Heat‚ H VIt I 2 Rt Application Electric iron‚ toaster‚ fused wire
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