# Electrical resistance

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resists current, and is measured in Ohm-meters (Ω-m). Electrical resistance (R) is the opposite of the flow of electrons, or the passage of an electrical current. Electrical conductivity (σ) is the opposite of resistivity and is measured in Siemens (S). Electrical conductivity is defined as; the degree to which a specified material conducts electricity, calculated as the ratio of the current density in the material to the electric field which causes the flow of current. In this experiment I am…

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In this experiment, various electrochemical cells were measured and calculated to determine their electrical cell potential. In the electrochemical cell Zn (s) │Zn2+ (0.10 M) ││ Cu2+ (0.10 M) │ Cu(s), E cell potential was determined to be 1.040 V while the standard E˚ cell potential was 1.10 V. In the electrochemical cell Zn (s) │Zn2+ (0.10 M) ││ Cu2+ (1.0 M) │ Cu(s) E cell potential was determined to be 1.060 V while the standard E˚ cell potential was 1.10 V. In the electrochemical cell Cu (s)…

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For example, if you have a resistor with a resistance of 3 ohms and the current at it being 1 amp the voltage drop at that resistor is 3 volts (3*1). If you have more than one resistor wired to that circuit you can check your math by adding all the voltage drops at the resistor together, the sum should equal to the voltage of the power source or battery. Parallel DC circuits differ from DC series circuits mainly in the way they are wired to their components. As opposed to series circuits in…

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The resistors R1, R2, RD, and RS calculated in the Prelab section were used to connect the circuit as shown in Figure 8-5. A load resistance RL of 10kΩ was used. The values of VD, VG, VS were measured and recorded. 3. The voltage vout was measured using an oscilloscope and the voltage gain AVG-D = vout/vin was calculated. The input voltage was adjusted if the output waveform was distorted. 4. The function generator was varied to obtain the necessary data to plot a frequency response curve for…

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Fig. 12 a and b shows the Nyquist plots of the fresh and after 5th cycles for Li1.2Ni0.13Co0.13Mn0.54O2 electrodes, respectively, where as the shapes of the Nyquist plots are similar. All the EIS curves exhibit one semicircle in the high frequency region which represents interfacial charge transfer resistance between the surface film and the active cathode mass (Rct). While, the sloping line at the low frequency region represents Warburg resistance, which related to the lithium ion diffusion in…

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There are also no clues within the stem. Initially, the unit was placed by the numbers in the options, but the units are best suited when included in the stem for clarity. Additionally, the directions to use the diagram are bolded. In listing options, numerical order is the appropriate logic, and the options are listed in a column. Furthermore, the options are selected based on common mistakes by students. For example, Option b is based on the relationship of resistors in series. Thus, if…

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Lab 2 Summary In this lab, the purpose was to understand how to use a DMM to measure different things like resistances, current, and voltages as well as how to successfully comprehend the electrostatic relationship between various objects. In the first part of our lab we learned how to use a Digital Multimeter by using a simulator to draw diagrams of circuits. This helped give us a basic understanding that when dealing with a circuit and tools like a DMM, you have to connect wires to certain…

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circuit. How to use both Maximum Power and Norton’s Theorem properly, are to be explained in order to solve a circuit using these approaches. THEORY MAXIMUM POWER Maximum power states that a load receives max power from a network when it’s resistance is exactly equal to the Thevenin and Norton resistance of the network supplying the power (as shown below): If the load resistance is higher or lower than the Thevenin/Norton equivalent then there would be no maximum power continued on…

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is resistance, which is measured in units called ohms. Resistance is a term that describes the forces that oppose the flow of electron current in a conductor. All materials naturally contain some resistance to the flow of electron current. We have not found a way to make conductors that do not have some resistance. If we use our water analogy to help picture resistance, think of a hose that is partially plugged with sand. The sand will slow the flow of water in the hose. We can say that the…

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Terminology and units Current Current is a flow of electrical charge carriers, usually electrons or electron-deficient atoms. The common symbol for current is the uppercase letter I. Potential difference The potential difference between two points.The units for potential difference are Joules per coulomb, or volts. (1 volt = 1 Joule/coulomb). Electrical charge Electric charge is carried by the electrons ( negative charge) and protons (positive charge) within an atom. The…

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