Principles and Applications of Electrical Engineering
6th Edition
ISBN: 9780073529592
Author: Giorgio Rizzoni Professor of Mechanical Engineering, James A. Kearns Dr.
Publisher: McGraw-Hill Education
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Question
Chapter 2, Problem 2.74HP
To determine
(a)
The value of current
To determine
(b)
The internal resistance of the meter
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The resistance for the network shown in Figure P2.20 between terminals a and b with copen circuited is Rab=50 Ω. Similarly, the resistance between terminals b and c with a open is Rbc=100 Ω,and between c and a with b open is Rca=70 Ω. Now, suppose that a short circuit isconnected from terminal b to terminal c, and determine the resistance between terminal a andthe shorted terminals b–c.
For the circuit shown in Figure P2.38, finda. The currents i1 and i2.b. The power delivered by the 3-A current source andby the 12-V voltage source.c. The total power dissipated by the circuit.Let R1 = 25 , R2 = 10 , R3 = 5 , R4 = 7 , andexpress i1 and i2 as functions of v. (Hint: Apply KCL at thenode between R1 and R3.)
For the circuit shown in Figure P2.35, determinethe power absorbed by the variable resistor R, rangingfrom 0 to 20 . Plot the power absorption as afunction of R.
Chapter 2 Solutions
Principles and Applications of Electrical Engineering
Ch. 2 - A free electron has an initial potential energy...Ch. 2 - The units for voltage, current, and resistance are...Ch. 2 - A particular fully charged battery can deliver...Ch. 2 - The charge cycle shown in Figure P2.4 is an...Ch. 2 - Batteries (e.g., lead-acid batteries) store...Ch. 2 - What determines: a. The current through an ideal...Ch. 2 - An automotive battery is rated at 120 A-h. This...Ch. 2 - A car battery kept in storage in the basement...Ch. 2 - Suppose the current through a wire is given by the...Ch. 2 - The charge cycle shown in Figure P2.10 is...
Ch. 2 - The charging scheme used in Figure P2.11 is...Ch. 2 - The charging scheme used in Figure P2.12 is...Ch. 2 - Use KCL to determine the unknown currents in the...Ch. 2 - Use KCL to find the current i1 and i2 in Figure...Ch. 2 - Use KCL to find the current i1,i2, and i3 in the...Ch. 2 - Use KVL to find the voltages v1,v2, and v3 in...Ch. 2 - Use KCL to determine the current i1,i2,i3, and i4...Ch. 2 - In the circuits of Figure P2.18, the directions...Ch. 2 - Find the power delivered by each source in Figure...Ch. 2 - Determine whether each element in Figure P2.20 is...Ch. 2 - In the circuit of Figure P2.21, determine the...Ch. 2 - For the circuit shown in Figure P2.22: a....Ch. 2 - For the circuit shown in Figure P2.23,...Ch. 2 - For the circuit shown in Figure P2.24, determine...Ch. 2 - For the circuit shown in Figure P2.25, determine...Ch. 2 - Prob. 2.26HPCh. 2 - Prob. 2.27HPCh. 2 - Prob. 2.28HPCh. 2 - Prob. 2.29HPCh. 2 - Prob. 2.30HPCh. 2 - Prob. 2.31HPCh. 2 - In the circuit of Figure P2.32, assume v2=vs/6 and...Ch. 2 - Prob. 2.33HPCh. 2 - An incandescent light bulb rated at 100 W will...Ch. 2 - An incandescent lightbulb rated at 60 W...Ch. 2 - Refer to Figure P2.36, and assume that...Ch. 2 - Refer to Figure P2.37, and assume that...Ch. 2 - Refer to Figure P2.38, and assume...Ch. 2 - Prob. 2.39HPCh. 2 - With no load attached, the voltage at the...Ch. 2 - Prob. 2.41HPCh. 2 - For the circuits of Figure P2.42, determine the...Ch. 2 - At an engineering site, a 1-hp motor is placed...Ch. 2 - Cheap resistors are fabricated by depositing a...Ch. 2 - Prob. 2.45HPCh. 2 - Use KCL and Ohm’s law to determine the current...Ch. 2 - Refer to Figure P2.13. Assume R0=1,R1=2,R2=3,R3=4...Ch. 2 - Apply KCL and Ohm’s law to find the power supplied...Ch. 2 - Refer to Figure P2.49 and assume...Ch. 2 - Refer to Figure P2.49 and assume...Ch. 2 - Prob. 2.51HPCh. 2 - The voltage divider network of Figure P2.52 is...Ch. 2 - Find the equivalent resistance seen by the source...Ch. 2 - Find the equivalent resistance seen by the source...Ch. 2 - In the circuit of Figure P2.55, the power absorbed...Ch. 2 - Find the equivalent resistance between terminals...Ch. 2 - For the circuit shown in Figure P2.57, find the...Ch. 2 - For the circuit shown in Figure P2.58,find the...Ch. 2 - Refer to Figure P2.59. Assume...Ch. 2 - Find the equivalent resistance seen by the source...Ch. 2 - For the circuit shown in Figure P2.61. assume...Ch. 2 - Determine the equivalent resistance of the...Ch. 2 - For the circuit shown in Figure P2.58, assume...Ch. 2 - In the circuit of Figure P2.64, find the...Ch. 2 - Refer to Figure P2.64 and determine the equivalent...Ch. 2 - Find the equivalent resistance seen by the source...Ch. 2 - Determine the voltage vo between nodes A and Bin...Ch. 2 - Refer to Figure P2.68 and assume...Ch. 2 - Prob. 2.69HPCh. 2 - Prob. 2.70HPCh. 2 - Prob. 2.71HPCh. 2 - The circuit of Figure P2.72 is used to measure the...Ch. 2 - Consider the practical ammeter, depicted in Figure...Ch. 2 - Prob. 2.74HPCh. 2 - Prob. 2.75HPCh. 2 - Prob. 2.76HPCh. 2 - A voltmeter is used to determine the voltage...Ch. 2 - Prob. 2.78HPCh. 2 - Figure P2.79 shows an aluminum cantilevered beam...Ch. 2 - Refer to Figure P2.79 but assume that the...
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- Determine the values of vx and iy in the circuit of Figure Q2 (b) and determine the number of branches and nodes in the circuit shown in Figure Q2 (b).arrow_forwardFind the equivalent resistance for the infinite network shown in Figure P2.12(a). Because of its form, this network is called a semi-infinite ladder. [Hint: If another section is added to the ladder as shown in Figure P2.12(b), the equivalent resistance is the same. Thus, working from Figure P2.12(b), we can write an expression for Req in terms of Req.Then, we can solve for Req.arrow_forwardConsider a circuit shown in the figure. Ignore the internal resistances of the batteries. ℰ1 = 24 Vℰ2 = 22 VR1 = 4 ΩR2 = 3 ΩR3 = 4 Ω A) Express the current I1 going through resistor R1 in terms of the currents I2 and I3 going through resistors R2 and R3. Use the direction of the currents as specified in the figure. B) Write the equation of potential change in loop EBAF in terms of the circuit elements. C) Write the equation of potential change in loop DCAF in terms of the circuit elements. D) Solve the three equations to get I3. (expression) E) Calculate the numerical value of I3 in A. F) Calculate the numerical value of I2 in A. G) Calculate the numerical value of I1 in A.arrow_forward
- In the circuit of Figure P2.61, the power absorbed by the 20- resistor is 20W. Find R. Given: VS = 50 V, R1 = 20 , R2 = 5 , R3 = 2 , R4 = 8 , R5 = 8 , R6 = 30 .arrow_forwardFor the circuit shown in Figure P2.49, find the equivalent resistance, where R1 = 5 , R2 = 1 k , R3 = R4 = 100 , R5 = 9.1 and R6 = 1 k .arrow_forwardFor the circuit shown in Figure P2.22:a. Determine which components are absorbing powerand which are delivering power.b. Is conservation of power satisfied? Explain youranswer.arrow_forward
- Given the circuit, where the rate at which R1 is dissipating electrical energy is 20.0W. When the total current flowing in the circuit is 3.50A, find:a.) R1 and R2b.) Emf of the batteryc.) Current through both R2 and the 10.0-ohm resistance d.) What is the total electrical consumptionarrow_forwardFind the equivalent resistance seen by the sourceand the current i in the circuit of Figure P2.60. Given:VS = 12 V, R0 = 4 , R1 = 2 , R2 = 50 ,R3 = 8 , R4 = 10 , R5 = 12 , R6 = 6 .arrow_forwardFor the circuit shown in Figure P2.63 finda. The equivalent resistance seen by the source.b. The current through and the power absorbed by the90- resistance. Given: VS = 110 V, R1 = 90 ,R2 = 50 , R3 = 40 , R4 = 20 , R5 = 30 ,R6 = 10 , R7 = 60 , R8 = 80 .arrow_forward
- Connect a 1-V voltage source across the terminals of the network shown in Figure P2.1(a). Then, solve the network by the mesh-current technique to find the current through the source. Finally, divide the source voltage by the current to determine the equivalent resistance looking into the terminals. Check your answer by combining resistances in series and parallel.arrow_forwardDetermine the value of v2 and the power delivered by the source in the circuit of Figure P2.24 by using mesh-current analysis.arrow_forwardThe voltage source has a output voltage Us of 230 V. Each light bulb requires 115 V, so U1 = U2. However, the two light bulbs have different power. P1 equals 60 W while P2 equals 100 W. Without the addition of the resistor R, the resistance of the light bulb with P1 is higher than the resistance of the light bulb with P2 equal to the resistance of the light bulb with P2 lower than the resistance of the light bulb with P2? Choose the correct variantarrow_forward
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