Laboratory Manual for Introductory Circuit Analysis
13th Edition
ISBN: 9780133923780
Author: Robert L. Boylestad, Gabriel Kousourou
Publisher: PEARSON
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Textbook Question
Chapter 5, Problem 5P
For each circuit board in Fig. 5.92, �nd the total resistance between connection tabs 1 and 2.
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Students have asked these similar questions
Three similar coils, connected in star, take a total
power of 1.5 kW, at a power factor of 0.2, from a
three-phase, 400 V, 50 Hz supply. Calculate: (a) the
resistance and inductance of each coil; (b) the line
currents if one of the coils is short-circuited.
(a) Three 20 µF capacitors are star-connected across
a 400 V, 50 Hz, three-phase, three-wire supply.
Calculate the current in each line. (b) If one of the
capacitors is short-circuited, calculate the line cur
rents. (c) If one of the capacitors is open-circuited,
calculate: the line currents and the p.d. across each
of the other two capacitors.
ANS:
1.525 A; 2.64 A, 2.64 A, 4.57 A; 1.32 A, 1.32 A, 0;
210 V
Explain the advantages of three-phase supply for
distribution purposes.
(b) Assuming the relationship between the line and
phase values of currents and voltages, show that
the active power input to a three-phase balanced
load is √3VI cos φ, where V and I are line quantities.
(c) Three similar inductors, each of resistance 10 Ω
and inductance 0.019 H, are delta-connected to a
three-phase, 400 V, 50 Hz sinusoidal supply. Calcu
late: the value of the line current; the power
factor and the active power input to the circuit.
ANS:
59.5 A, 0.858 lag, 35.5 kW
Chapter 5 Solutions
Laboratory Manual for Introductory Circuit Analysis
Ch. 5 - For each configuration in Fig. 5.88, find the...Ch. 5 - For each configuration in Fig. 5.89, find the...Ch. 5 - Find the total resistance RT for each...Ch. 5 - Find the total resistance RT for each...Ch. 5 - For each circuit board in Fig. 5.92, �nd the...Ch. 5 - For the circuit in Fig. 5.93, composed of standard...Ch. 5 - For each configuration in Fig. 5.94, determine the...Ch. 5 - Find the resistance R, given the ohmmeter reading...Ch. 5 - What is the ohmmeter reading for each...Ch. 5 - For the series configuration in Fig. 5.97,...
Ch. 5 - For the series configuration in Fig. 5.98,...Ch. 5 - Find the applied voltage necessary to develop the...Ch. 5 - For each network in Fig. 5.100, constructed of...Ch. 5 - For each configuration in Fig. 5.101, what are the...Ch. 5 - For each configuration of Fig. 5.102, find the...Ch. 5 - For the circuit in Fig. 5.103, constructed of...Ch. 5 - Find the unknown quantities for the circuit of...Ch. 5 - Find the unknown quantities for the circuit in...Ch. 5 - Eight holiday lights are connected in series as...Ch. 5 - For the conditions specified in Fig. 5.107,...Ch. 5 - Combine the series voltage sources in Fig. 5.108,...Ch. 5 - Determine the current I and its direction for each...Ch. 5 - Find {he unknown voltage source and resistor for...Ch. 5 - Using Kirchhoffs voltage law, find the unknown...Ch. 5 - Find the current I for the network of Fig. 5.112....Ch. 5 - Using Kirchhoffs voltage law, determine the...Ch. 5 - Using Kirchhoffs voltage law, find the unknown...Ch. 5 - Determine the values of the unknown resistors in...Ch. 5 - For the configuration in Fig. 5.116, with standard...Ch. 5 - Using the voltage divider rule, find the indicated...Ch. 5 - Using the voltage divider rule or Kirchhoffs...Ch. 5 - Using the voltage divider rule or Kirchhoffs...Ch. 5 - Using the information provided, find the unknown...Ch. 5 - Using the voltage divider rule, �nd the unknown...Ch. 5 - Design a voltage divider circuit that will permit...Ch. 5 - Design the voltage divider in Fig. 5.122 such that...Ch. 5 - Find the voltage across each resistor in Fig....Ch. 5 - Design the circuit in Fig. 5.124 such that...Ch. 5 - Determine the voltages Va,Vb, and Vab for the...Ch. 5 - Determine the current I (with direction) and the...Ch. 5 - For the network in Fig. 5.127 determine the...Ch. 5 - Given the information appearing in Fig. 5.128,...Ch. 5 - Determine the values of R1,R2,R3, and R4 for the...Ch. 5 - For the network in Fig. 5.130, determine the...Ch. 5 - For the integrated circuit in Fig. 5.131,...Ch. 5 - For the integrated circuit in Fig. 5.132,...Ch. 5 - Find the internal resistance of a battery that has...Ch. 5 - Find the voltage to the load (full-and conditions)...Ch. 5 - Determine the current through the circuit in Fig....Ch. 5 - Use the computer to verify the results of Example...Ch. 5 - Use the computer to verify the results of Example...Ch. 5 - Use the computer to verify the results of Example...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- not use ai pleasearrow_forwardA three-phase, 400 V, star-connected motor has an output of 50 kW, with an efficiency of 90 per cent and a power factor of 0.85. Calculate the line current. Sketch a phasor diagram showing the voltages and currents. If the motor windings were connected in mesh, what would be the correct voltage of a three phase supply suitable for the motor? ANS: 90.8 A, 240 Varrow_forwardDon't use ai to answer I will report you answerarrow_forward
- Show with the aid of a phasor diagram that for both star- and delta-connected balanced loads, the total active power is given by √3VI cos φ, where V and I are the line values of voltage and current respectively and φ is the angle between phase values of voltage and current. A balanced three-phase load consists of three coils, each of resistance 4 Ω and inductance 0.02 H. Determine the total active power when the coils are (a) star-connected, (b) delta-connected to a 400 V, three phase, 50 Hz supply. ANS:11.56 kW, 34.7 kWarrow_forwardThe load connected to a three-phase supply comprises three similar coils connected in star. The line currents are 25 A and the apparent and active power inputs are 20 kVA and 11 kW respectively. Find the line and phase voltages, reactive power input and the resistance and reactance of each coil. If the coils are now con nected in delta to the same three-phase supply, calculate the line currents and the active power taken. ANS : 462 V, 267 V, 16.7 kvar, 5.87 Ω, 8.92 Ω; 75 A, 33 kWarrow_forwardA three-phase delta-connected load, each phase of which has an inductive reactance of 40 Ω and a resistance of 25 Ω, is fed from the secondary of a three-phase star-connected transformer which has a phase voltage of 230 V. Draw the circuit diagram of the system and calculate: (a) the current in each phase of the load; (b) the p.d. across each phase of the load; (c) the current in the transformer secondary windings; the total active power taken from the supply and its power factor.arrow_forward
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