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Q: stimate at what temperature will tungsten have the same resistivity as copper at 20°C ungsten =…
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Q: 42 82 find: ス? え。 a. Vxy メ 8 5L b equivalent resistance c. each current え=う a え:?
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Q: 9. The resistivity is measured in O ohm/m ohm/m^2 ohm-m
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Q: Which of these is the correct equivalent to an ohm (2) ? * O VIA O V A2 O VA O A/V
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Q: Which of the following I-V graph represents ohmic conductors? O a. Ob. レ. Od. IA
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Q: Then use these values to find the value of Rs when ratio (L2) = 2, L1 The value of Rs is v ohm
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A: As per our guidelines, we are supposed to answer only first one question in case of multiple…
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Q: 12 V 2A
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Q: 10. (II) A 4.5-V battery is connected to a bulb whose resistance is 1.3. How many electrons leave…
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Q: 10 Ω www + 35 V E 5Ω ww + Vo
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Q: Using Superposition Theorem, find VO in the circuit given bel 40 V. 10 ww 50 3 V 9 V ww
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Q: 6. For the circuit board in Fig. 7.66: a. Find the total resistance Ry of the configuration. b. Find…
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Q: . Determine the currents I, and la 2 A 7A I. ЗА 4 A
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Q: Find the resistance in ohms between node 1 and node 2. R1= 1.86 Ω, R2= 2.17 Ω, R3= 1.03 Ω, R4= 4.10…
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Q: For the following circuit in the figure below. Determine Vp-Va (in units of V) for & = 43 V. %3D a…
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Q: For the following circuit in the figure below. Determine V,-Va ( in units of V) for ɛ = 43.2 V. a
A: Calculate the equivalent resistance between points a and b.1R1=12 Ω+12 Ω R1=1 Ω
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Q: if Vs = 15 V and R1 = 1.5 k ohm and the voltage on R1 is 4.69 V. find the value of R2
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Q: Ohms law is O a. Voltage is directly proportional to I Ob.Voltage is proportional to R OC. Voltage…
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Q: ohm 6ohm 5v find the value of v1 and v2
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- The number density of conduction electrons in a metal can be found from the density ρ of the metal, the mass per mole M of the metal, the number of conduction electrons per metal atom, and Avogadro’s number NA. If we assume one conduction electron per atom, which of the following gives the number density of conduction electrons for a given metal? a. NA ρM b.NA ρ/M c. NA M/ρ d. NA /ρMQuestion 1 a) Ina closed circuit, an electric current of intensity i goes through a resistor of resistance R. The electric potential at the edges of R is measured to be V. If now we write R would this generally bethe definition ofthe resistance quantity R, or the expression of Ohm's Law? Explain. b) We define the resistivity (via the familiar notation) as E p= Thus show that the resistance R can be written as, R =p- here Lis the length ofthe resistor, and A is the cross-sectional area ofit. c) Let J the curent density (i/A). Express J in tems of the electron density n (electrons/m), the electron drift velocity va, and the electron charge e. d) Show that the resistivity can be expressed (via the familiar notation) as, m p= ne't here m is the electronmass; t is the period of time that elapses between two subsequent collisions, the electron undergoes with copper nuclei throughout its chaotic motion in the body of copper (supposing that the current carrying cable is made of copper). Hint:…Q2. Transistors are manufactured by doping semiconductors. The diffusion coefficient of phosphorus in Si is D = 6.5 x 10-11 mm2/s at a temperature of 950°C. Assume the source provides a surface concentration of 1020 atoms/cm3 and the diffusion time is one hour. Assume that the silicon wafer initially contains no phosphorus. Calculate the depth at which the concentration of phosphorus will be 1018 atoms/cm3.
- Copper has mass density of 8.95 g/cm^2 and n electrical resistivity of 1.55 ×10^-8 ohm -m at room temperature. Assuming the effective mass is "mo " ,calcualte a, the concentration of the conduction electron . b,mean free time . c ,the Fermi energy.: A uniform piece of n-type of silicon that is lum long senses a voltage of 1 v. Determine the velocity of the electrons. Use p1350 cm/V.sesCylindrical-conductors has inner and outer radii of 25 mm and 50 mm, respectively. If V(p = 25 mm) = 0 V and V(p = 50 mm) = 300 V, ɛr = 15 %3D calculate : a. V, E, and D at p = 40 mm b. Ps on each plate. %3D
- Problems Q1: Calculate the drift current density in silicon sample. If T=300 K, N=102/m*, Na=102/m’V, un=0.85m’/V.s, Up=0.04m/V.s, E=35 V/cm.. (Ans: 6.8×104A/m²).3) a) A wire sample (1 mm in diameter by 1 m in length) of an aluminum alloy (containing 1.2% Mn) is placed in an electrical circuit such as that shown in the figure below. A voltage drop of 432 mV is measured across the length of the wire as it carries a 10 A current. Calculate the electrical conductivity of this alloy - Length, / Area, A Sample geometry b) Copper has an electrical conductivity of 58.00 x 10° S/m and a free electron density of 104 x 102'm³. Calculate the drift velocity of these electrons under an electric field of 0.5 V/m.1. a six inch wafer of ic that measure 2mm *3mm is fabricated using a process with seven crutical steps and a total density of 5 cm^-2 a) What is the probability that a single IC will have a defect b) What is the probability that a single IC will have two defect.
- A thermocouple is a temperature-measurement device that consists of two dissimilar metal wires joined at one end. An oversimplified diagram follows. Metal 1 POTENTIOMETER V(mV) Metal 2 A voltage generated at the metal junction is read on a potentiometer or millivoltmeter. When certain metals are used, the voltage varies expon with the temperature at the junction of the two metals: V(mV) = a exp(b.T (°C)) An iron-constantan thermocouple (constantan is an alloy of copper and nickel) is calibrated by inserting its junction in boiling water and measuring a voltage 6 mV, and then inserting the junction in gold at its melting point and measuring 72 mV. 1. Using linearization method find the value of the constant a and b. 2. Derive and equation for V measured in V in terms of T measured in ('R).Q8. Estimate the mean free path of electrons in copper. Assume the Fermi energy of copper is 7.03eV. The number of electrons per unit volume is 8.49 x1028 m³. The effective mass of an electron in copper is 1.47 times the rest mass of the electron. The conductivity of copper is 5.9x107 S/m.2.a Why is silicon widely used as a semi conductive material over Germanium? 2.bFind the power delivered to an element at t = 30s if the current entering its positive terminals is I=cos60πt A and the voltage is v = Qi. 2.c The total charge entering a terminal is given by Q=10tcos4πt mC . Calculate the current at t = 0.5 sec.
