Electrical Engineering: Principles & Applications, 7th Edition
Electrical Engineering: Principles & Applications, 7th Edition
7th Edition
ISBN: 9780134485201
Author: Allan R. Hambley
Publisher: PEARSON
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Chapter 4, Problem 4.30P

Consider the circuit of Figure P4.30 in which the switch has been closed for a long time prior to t = 0. Determine the values of v C ( t ) before t = 0 and a long time after t = 0. Also, determine the time constant after the switch opens and expressions for v c ( t ) . Sketch v c ( t ) to scale versus time for 4 t 16 s .
Chapter 4, Problem 4.30P, Consider the circuit of Figure P4.30 in which the switch has been closed for a long time prior to t

Figure P4.30

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a. A silicon sample maintained at room temperature is uniformly doped with ND=10¹6/cm³ donors. Calculate the resistivity of the sample. b. The silicon sample of part (a) is "compensated" by adding NA=1016/cm³ acceptors. Calculate the resistivity of the compensated sample. c. Compute the resistivity of intrinsic silicon at room temperature. d. A 500 resistor is to be made from a bar-shaped piece of n-type Si. The bar has a cross sectional area of 102 cm² and a current-carrying length of 1 cm. Determine the doping required. μn or μp (cm²/V-sec) 1000 Electrons Holes NA or ND (cm³) 1x1014 Мет Mp (cm2V-sec) 1358 461 2 1357 460 100 5 1352 459 1 x 1015 1345 458 2 1332 455 5 1298 448 1 x 1016.... 1248 437 2 1165 419 5 986 378 1 x 1017 801 331 10 1014 1015 1016 NA or ND (cm-³) 1017 1018 Silicon T = 300 K
4. Two different silicon samples maintained at 300K are characterized by the energy band diagrams. Answer the questions that follow after choosing a specific diagram for analysis. a) Do equilibrium conditions prebail? How do you know? b) Sketch the electrostatic potential (V) inside the semiconductor as a function of x. c) Sketch the electric field (ε) inside the semiconductor as a function of x. EF Ec E₁ Ev E₁ EF Ev X X 0 L/2 L 0 L/2 L 3.
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Chapter 4 Solutions

Electrical Engineering: Principles & Applications, 7th Edition

Ch. 4 - We know that the capacitor shown in Figure P4.11...Ch. 4 - The purchasing power P of a certain unit of...Ch. 4 - Derive an expression for vC(t) in the circuit of...Ch. 4 - Suppose that at t= 0, we connect an uncharged 10 F...Ch. 4 - Suppose we have a capacitance C that is charged to...Ch. 4 - A person shuffling across a dry carpet can be...Ch. 4 - Prob. 4.17PCh. 4 - Consider the circuit shown in Figure P4.18. Prior...Ch. 4 - List the steps for dc steady-state analysis of RLC...Ch. 4 - Explain why we replace capacitances with open...Ch. 4 - Solve for the steady-state values of i1, i2, and...Ch. 4 - Consider the circuit shown in Figure P4.22. What...Ch. 4 - In the circuit of Figure P4.23, the switch is in...Ch. 4 - The circuit shown in Figure P4.24 has been set up...Ch. 4 - Solve for the steady-state values of i1 , i2, i3,...Ch. 4 - The circuit shown in Figure P4.26 is operating in...Ch. 4 - Prob. 4.27PCh. 4 - Consider the circuit of Figure P4.28 in which the...Ch. 4 - For the circuit shown in Figure P4.29, the switch...Ch. 4 - Consider the circuit of Figure P4.30 in which the...Ch. 4 - Give the expression for the time constant of a...Ch. 4 - A circuit consists of switches that open or close...Ch. 4 - The circuit shown in Figure P4.33 is operating in...Ch. 4 - Consider the circuit shown in Figure P4.34. The...Ch. 4 - Repeat Problem P4.34 given iL(0)=0A .Ch. 4 - Real inductors have series resistance associated...Ch. 4 - Determine expressions for and sketch is(t) to...Ch. 4 - For the circuit shown in Figure P4.38,, find an...Ch. 4 - The circuit shown in Figure P4.39 is operating in...Ch. 4 - Consider the circuit shown in Figure P4.40. A...Ch. 4 - Due to components not shown in the figure, the...Ch. 4 - The switch shown in Figure P4.42 has been closed...Ch. 4 - Determine expressions for and sketch vR(t) to...Ch. 4 - What are the steps in solving a circuit having a...Ch. 4 - Prob. 4.45PCh. 4 - Solve for vC(t) for t > 0 in the circuit of Figure...Ch. 4 - Solve for v(t) for t > 0 in the circuit of Figure...Ch. 4 - Prob. 4.48PCh. 4 - Consider the circuit shown inFigure P4.49. The...Ch. 4 - Consider the circuit shown in Figure P4.50. The...Ch. 4 - The voltage source shown in Figure P4.51 is called...Ch. 4 - Determine the form of the particular solution for...Ch. 4 - Determine the form of the particular solution for...Ch. 4 - Prob. 4.54PCh. 4 - Prob. 4.55PCh. 4 - How can first-or second-order circuits be...Ch. 4 - Prob. 4.57PCh. 4 - Prob. 4.58PCh. 4 - Prob. 4.59PCh. 4 - Sketch a step response for a second-order system...Ch. 4 - A dc source is connected to a series RLC circuit...Ch. 4 - Repeat Problem P4.61 for R = 40 .Ch. 4 - Repeat Problem P4.61 for R = 20 .Ch. 4 - Prob. 4.64PCh. 4 - Repeat Problem P4.64 for R=50 .Ch. 4 - Repeat Problem P4.64 for R=500 .Ch. 4 - Solve for i(t) for t > 0 in the circuit of Figure...Ch. 4 - Prob. 4.68PCh. 4 - Prob. 4.69PCh. 4 - Prob. 4.70PCh. 4 - Use MATLAB to derive an expression for vc(t)in the...Ch. 4 - Prob. 4.72PCh. 4 - Consider the circuit shown in FigureP4.50 in which...Ch. 4 - Prob. 4.74PCh. 4 - Prob. 4.75PCh. 4 - Use MATLAB to solve for the mesh currents in the...Ch. 4 - The switch m the circuit shown in Figure T4.1 is...Ch. 4 - Prob. 4.2PTCh. 4 - Consider the circuit shown in Figure T4.3. Figure...Ch. 4 - Consider the circuit shown in Figure T4.4 in which...Ch. 4 - Write the MATLAB commands to obtain the solution...
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