Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 21, Problem 1RQ
In a pure capacitive circuit, does the current lead or lag the voltage?
Expert Solution & Answer
To determine
Whether the current leads or lags the voltage in a pure capacitive circuit.
Answer to Problem 1RQ
In a pure capacitive circuit, the current leads the applied voltage by .
Explanation of Solution
Description:
As can be seen from the above figure,
At 0°, value for the applied voltage is zero, while the graph for current is at its positive peak.
At 90°, value for the applied voltage is at its positive peak , while the graph for current is at zero.
At 180°, value for the applied voltage is zero, while the graph for current reaches negative peak.
At 270°, value for the applied voltage reaches negative peak, while the graph for current rises towards zero from the negative peak.
From the above pattern it can be interpreted that current leads the applied voltage by in pure capacitive circuit.
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A certain signal f(t) has the following PSD (assume 12 load):
| Sƒ(w) = π[e¯\w\ + 8(w − 2) + +8(w + 2)]
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(b) What is the mean power in the bandwidth 0.99 to 1.01 rad/sec?
(c) What is the mean power in the bandwidth 1.99 to 2.01 rad/sec?
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+
2T
SfLw) dw
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An AM modulation waveform signal:-
p(t)=(8+4 cos 1000πt + 4 cos 2000πt) cos 10000nt
(a) Sketch the amplitude spectrum of p(t).
(b) Find total power, sideband power and power efficiency.
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Chapter 21 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 21 - In a pure capacitive circuit, does the current...Ch. 21 - A series circuit contains a 20- resistor and a...Ch. 21 - An RC series circuit has a power factor of 76%....Ch. 21 - An RC series circuit has a total impedance of 84 ....Ch. 21 - A capacitor has a capacitive reactance of 50 when...Ch. 21 - A 15-F AC capacitor is connected in series with a...Ch. 21 - An RC series circuit is connected to a 120-V,...Ch. 21 - An RC series circuit is connected to a 240-V,...Ch. 21 - Prob. 1PPCh. 21 - Assume that the voltage drop across the resistor,...
Ch. 21 - Assume the circuit shown in Figure 21-1 has an...Ch. 21 - Assume the circuit in Figure 21-1 has a power...Ch. 21 - In a series RC circuit, ET=240 volts, R=60, and...Ch. 21 - In a series RC circuit, ET=120 volts, R=124, and...Ch. 21 - In a series RC circuit, ET=208 volts, IT=2.4...Ch. 21 - In a series RC circuit, ET=460 volts and =44. Find...Ch. 21 - In a series RC circuit, ET=240 volts at 60 Hz. An...Ch. 21 - In a series RC circuit, the apparent power is 4250...
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