Electric Circuits Tutorial | Boston University - Edubirdie

University:
Boston University
Course:
ENG EC 410 | Introduction to Electronics
Academic year:

2019
Views:

407

Pages:

5
Author:

KLogan

Electric Circuits Problem 1.8 The current entering the upper terminal of Fig. 1.5 is  = 20cos 5000  Assume the charge at the upper terminal is zero at the instant the current is passing through its maximum value. Find the expression for q(t). Solution: Problem 1.19 The voltage and current at the terminals of the circuit element in Fig. 1.5 are zero for t<0. For t≥0, they are:  = 75 − 75    = 50  1 a) Find the maximum value of the power delivered to the circuit. b) Find the total energy delivered to the circuit element. Solution: Problem 1.23 The voltage and current at the terminals of the circuit element in Fig. 1.5 are zero for t<0 and t>40s. In the interval between 0 and 40s, the expressions are:  = 1 − 0.025, 0 <  < 40  = 4 − 0.2, 0 <  < 40 a) At what instant of time is the power being delivered to the circuit element maximum? b) What is the power at the time found in Part (a)? c) Calculate the net energy delivered to the circuit at t=0, 10, 20, 30 and 40s. Solution: 2 3 Problem 1.26 The voltage and current at the terminals of an automobile battery during a charge cycle are shown in Fig. P1.26: a) Calculate the total charge transferred to the battery. b) Calculate the total energy transferred to the battery. Solution: 4 Problem 1.30 The numerical values of the voltages and currents in the interconnection seen in Fig. P1.30 are given in Table 1.30. Does the interconnection satisfy the power check? Solution: 5

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