To determine Calculate the voltage v o ( t ) when t ≥ 0 for the given circuit using PSPICE. Explanation Given data: The 50 Ω resistor in the circuit is decreased to 40 Ω . R = 40 Ω Formula used: Write the condition for critically damped response for a parallel RLC circuit as follows: α 2 = ω 0 2 (1) Here, α is the neper frequency and ω 0 is the resonant radian frequency. Write the condition for over-damped response for a parallel RLC circuit as follows: ω 0 2 < α 2 (2) Write the condition for under-damped response for a parallel RLC circuit as follows: ω 0 2 > α 2 (3) Write the expression for resonant radian frequency for the given circuit as follows: ω 0 = 1 L C (4) Here, L is the inductance of the inductor, and C is the capacitance of the capacitor. Write the expression for neper frequency for the given circuit as follows: α = 1 2 R C (5) Here, R is the resistance of the resistor. Write the expression of required voltage response v o ( t ) for critically-damped response of a parallel RLC circuit as follows: v o ( t ) = D 1 t e − α t + D 2 e − α t , t ≥ 0 (6) Here, D 1 , D 2 are arbitrary constants. Write the expression to obtain the value of D 2 . D 2 = V 0 (7) Write the expression to obtain the value of D 1 . D 1 − α D 2 = 1 C ( − V 0 R − I 0 ) (8) Calculation: From the given circuit, the switch 1 is closed for long time to the source and inductor. As the inductor gets short circuit at steady state, the entire source current flows through the inductor and it does not flow through 250 Ω resistor. Therefore, the current through the inductor for t < 0 is 5 A . The negative sign is due to the reverse direction of the current through the inductor. i L ( 0 − ) = 5 A I 0 = 5 A From the given circuit, the switch 2 is closed for long time to the source and capacitor through the resistor. As the capacitor gets open circuit at steady state, the entire source voltage reflects across the capacitor. Therefore, the voltage across the capacitor for t < 0 is 100 V. v C ( 0 − ) = 100 V V 0 = 100 V As it is required to find the required voltage response across the 40 Ω resistor, consider the value of R as 40 Ω . Substitute 40 for R and 25 μ for C in Equation (5) to obtain the value of α . α = 1 ( 2 ) ( 40 ) ( 25 × 10 − 6 ) = 500 rad / s Substitute 160 m for L and 25 μ for C in Equation (4) to obtain the value of ω 0

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Chapter 8, Problem 12P

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Calculate the voltage vo(t) when t≥0 for the given circuit using PSPICE.

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Chapter 8, Problem 11P

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Chapter 8 Solutions

EBK ELECTRIC CIRCUITS

Ch. 8.1 - The resistance and inductance of the circuit in...Ch. 8.2 - Use the integral relationship between iL and v to...Ch. 8.2 - Prob. 3AP Ch. 8.2 - Prob. 4AP Ch. 8.2 - Prob. 5AP Ch. 8.3 - Prob. 6AP Ch. 8.4 - The switch in the circuit shown has been in...Ch. 8.4 - Prob. 8AP Ch. 8 - Prob. 1P Ch. 8 - Prob. 2P

Ch. 8 - The resistance in Problem 8.1 is decreased to80 Ω...Ch. 8 - Prob. 4P Ch. 8 - Prob. 5P Ch. 8 - The natural voltage response of the circuit in...Ch. 8 - Prob. 7P Ch. 8 - Prob. 8P Ch. 8 - The natural response for the circuit shown in Fig....Ch. 8 - Prob. 10P Ch. 8 - The two switches in the circuit seen in Fig.P8.11...Ch. 8 - The resistor in the circuit of Fig. P8.11 is...Ch. 8 - The resistor in the circuit of Fig.P8.11 is...Ch. 8 - The switch in the circuit of Fig. P8.17 has been...Ch. 8 - The inductor in the circuit of Fig. P8.17 is...Ch. 8 - The inductor in the circuit of Fig. P8.17 is...Ch. 8 - Design a parallel RLC circuit (see Fig. 8.1) using...Ch. 8 - Prob. 18P Ch. 8 - Prob. 19P Ch. 8 - Find υ(t) for t ≥ 0 in the circuit in Problem 8.19...Ch. 8 - Prob. 21P Ch. 8 - Prob. 22P Ch. 8 - The initial value of the voltage υ in the circuit...Ch. 8 - Prob. 24P Ch. 8 - Prob. 25P Ch. 8 - Prob. 26P Ch. 8 - Prob. 27P Ch. 8 - Prob. 28P Ch. 8 - Prob. 29P Ch. 8 - Prob. 30P Ch. 8 - The switch in the circuit in Fig. P8.31 has been...Ch. 8 - Prob. 32P Ch. 8 - There is no energy stored in the circuit in Fig....Ch. 8 - For the circuit in Fig. P8.30, find υo for t ≥...Ch. 8 - The switch in the circuit in Fig. P8.36 has been...Ch. 8 - Prob. 36P Ch. 8 - Prob. 37P Ch. 8 - Prob. 38P Ch. 8 - Prob. 39P Ch. 8 - Find the voltage across the 80 nF capacitor for...Ch. 8 - The initial energy stored in the 31.25 nF...Ch. 8 - In the circuit in Fig. P8.42, the resistor is...Ch. 8 - Design a series RLC circuit (see Fig. 8.3) using...Ch. 8 - Change the resistance for the circuit you designed...Ch. 8 - Prob. 45P Ch. 8 - Prob. 46P Ch. 8 - The switch in the circuit shown in Fig. P8.48 has...Ch. 8 - The switch in the circuit in Fig. P8.48 has been...Ch. 8 - The initial energy stored in the circuit in Fig....Ch. 8 - The resistor in the circuit shown in Fig. P8.50 is...Ch. 8 - The resistor in the circuit shown in Fig. P8.50 is...Ch. 8 - Prob. 52P Ch. 8 - The two switches in the circuit seen in Fig. P8.53...Ch. 8 - Prob. 55P Ch. 8 - Prob. 57P Ch. 8 - Prob. 58P Ch. 8 - Prob. 59P Ch. 8 - Prob. 60P Ch. 8 - Prob. 61P Ch. 8 - Derive the differential equation that relates the...Ch. 8 - The voltage signal of Fig. P8.63(a) is applied to...Ch. 8 - The circuit in Fig. P8.63 (b) is modified by...Ch. 8 - Prob. 65P Ch. 8 - Prob. 66P Ch. 8 - Prob. 67P Ch. 8 - Prob. 68P

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