Electronics Fundamentals: Circuits, Devices & Applications
8th Edition
ISBN: 9780135072950
Author: Thomas L. Floyd, David Buchla
Publisher: Prentice Hall
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Textbook Question
Chapter 9, Problem 28P
In Figure 9-70, the capacitor is charged to 25 V. Find the capacitor voltage at the following times when the switch is closed:
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Find Laplace transform and the corresponding ROC for
x(t) = e−3sin(2t) u(t)dt
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
Chapter 9 Solutions
Electronics Fundamentals: Circuits, Devices & Applications
Ch. 9 - The area of the plates of a capacitor is...Ch. 9 - A capacitance of 1200pF is the same as 1.2F.Ch. 9 - When two capacitors are in series with a voltage...Ch. 9 - When two capacitors are in parallel with a voltage...Ch. 9 - Prob. 5TFQCh. 9 - Prob. 6TFQCh. 9 - Prob. 7TFQCh. 9 - Prob. 8TFQCh. 9 - Voltage leads current in a capacitor.Ch. 9 - Prob. 10TFQ
Ch. 9 - Prob. 1STCh. 9 - Prob. 2STCh. 9 - Prob. 3STCh. 9 - A capacitance of 1000pF is smaller than 0.01F...Ch. 9 - Prob. 5STCh. 9 - Prob. 6STCh. 9 - Prob. 7STCh. 9 - Prob. 8STCh. 9 - Prob. 9STCh. 9 - Prob. 10STCh. 9 - Prob. 11STCh. 9 - Prob. 12STCh. 9 - Prob. 13STCh. 9 - A sinusoidal voltage is applied across a...Ch. 9 - Prob. 15STCh. 9 - Prob. 1TSCCh. 9 - Prob. 2TSCCh. 9 - Prob. 3TSCCh. 9 - Prob. 4TSCCh. 9 - Determine the cause for each set of symptoms....Ch. 9 - Find the capacitance when Q=50CandV=10V. Find the...Ch. 9 - Convert the following values from microfarads to...Ch. 9 - Convert the following values from picofarads to...Ch. 9 - Convert the following values from farads to...Ch. 9 - What size capacitor is capable of storing 10mJ of...Ch. 9 - A mica capacitor has a plate area of 20cm2 and a...Ch. 9 - An air capacitor has plates with an area of 0.1m2....Ch. 9 - A student wants to construct a 1F capacity out of...Ch. 9 - A student decide to construct a capacitor using...Ch. 9 - At ambient temperature (25oC), a certain capacitor...Ch. 9 - A 0.001F capacitor has a positive temperature...Ch. 9 - In the construction of a stacked-foil mica...Ch. 9 - What type of capacitor has the higher dielectric...Ch. 9 - Show how to connect an electrolytic capacitor...Ch. 9 - Determine the value of the typographically labeled...Ch. 9 - Name two types of electrolytic capacitors. How do...Ch. 9 - Prob. 17PCh. 9 - Five 1000pF capacitors are in series. What is the...Ch. 9 - Find the total capacitance for each circuit in...Ch. 9 - For each circuit in Figure 9-65 determine the...Ch. 9 - The total charge stored by the series capacitors...Ch. 9 - Determine CT for each circuit in Figure 9-67.Ch. 9 - Determine the total capacitance and total charge...Ch. 9 - Assume you need a total capacitance of 2.1F in a...Ch. 9 - Determine the time constant for each of the...Ch. 9 - Determine how long it takes the capacitor to reach...Ch. 9 - In the circuit of Figure 9-69, the capacitor...Ch. 9 - In Figure 9-70, the capacitor is charged to 25 V....Ch. 9 - Repeat Problem 27 for the following time...Ch. 9 - Repeat Problem 28 for the following time...Ch. 9 - Deterimine XC for a 0.0047F capacitor at each of...Ch. 9 - What is the value of the total capacitive...Ch. 9 - For the circuit in Figure 9-72, find the reactance...Ch. 9 - Prob. 34PCh. 9 - A sinusoidal voltage of 20Vrms produces an rms...Ch. 9 - A 10 kHz voltage is applied to a 0.0047F...Ch. 9 - Determine the true power and the reactive power in...Ch. 9 - If another capacitor is connected in parallel with...Ch. 9 - Ideally, what should the reactance of a bypass...Ch. 9 - Two series capacitors (one 1F, the other of...Ch. 9 - Prob. 41PCh. 9 - How long does it take C to charge to 8 V in Figure...Ch. 9 - Detemine the time constant for the circuit in...Ch. 9 - In Figure 9-74, the capacitor initially is...Ch. 9 - The capacitor in Figure 9-75 is uncharged when the...Ch. 9 - Determine the ac voltage across each capacitor and...Ch. 9 - Find the value of C1 in Figure 9-77.Ch. 9 - How much does the voltage across C5andC6 change...Ch. 9 - If C4 in Figure 9-76 is open determine the voltage...Ch. 9 - Prob. 50PCh. 9 - Prob. 51PCh. 9 - Prob. 52PCh. 9 - Prob. 53PCh. 9 - Prob. 54P
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- 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 kWarrow_forwardnot 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_forward
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