Delmar's Standard Textbook of Electricity (MindTap Course List)
6th Edition
ISBN: 9781285852706
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 26, Problem 3RQ
Assume that a voltage of
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Students have asked these similar questions
1. A purely resistive circuit the current is leading by 90° with respect to voltage.
2. A purely inductive circuit the current is lag behind the voltage by 90°.
3. A purely capacitive circuit the current is lead by 90° with respect to the voltage.
4. A capacitor element stored magnetic energy.
5. An inductor element stored electrical energy.
6. Resistor elements consume power.
7. Angle between current and voltage is called power.
8. The power factor angle for a purely resistive is zero.
9. The power factor angle for a purely inductive load is -90°.
10. The power factor of a purely capacitive is leading.
Calculate the voltage at 1.5¹ (milliseconds) for the following RC Circuit. Assume switch is closed and capacitor is in a charge
state.
t=0
LE
-10 V
oto
R1
1kQ
C1
1uF
5 minutes
3. The reactance offered by a capacitor to alternating current
of frequency 50 Hz is 10 ohms. If frequency is increased to 100
Hz reactance becomes
ohm
Chapter 26 Solutions
Delmar's Standard Textbook of Electricity (MindTap Course List)
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- You find that a 25-F capacitor connected to 480 VAC is defective. The storeroom has no capacitors with a 480-VAC rating. However, you find two capacitors rated at 50 F and 370 VAC. Can these two capacitors be connected in such a manner that they can replace the defective capacitor? If yes, explain how they are connected and why the capacitors will not be damaged by the lower voltage rating. If no, explain why they cannot be used without damaging the capacitor.arrow_forwardA pure capacitive circuit is connected to a 480-volt, 60-Hz power source. An ammeter indicates a current flow of 24 amperes. The circuit current must be reduced to 16 amperes by connecting a second capacitor in series with the first. What is the value of the existing capacitor? What value capacitor should be connected in series with the original capacitor to limit the circuit current to 16 amperes?arrow_forwardIn a pure capacitive circuit, does the current lead or lag the voltage?arrow_forward
- A postage stamp mica capacitor has the following color marks starting at the upper left dot: yellow, violet, brown, green, no color, and blue. What are the capacitance value, tolerance, and voltage rating of this capacitor?arrow_forwardYou are working in an industrial plant. You have been instructed to double the capacitance connected to a machine. The markings on the capacitor, however, are not visible. The capacitor is connected to 560 volts and an ammeter indicates a current of 6 amperes flowing to the capacitor. What size capacitor should be connected in parallel with the existing capacitor? What is the minimum AC voltage rating of the new capacitor? What is the minimum DC voltage rating of the new capacitor? What is the minimum KVAR size that can be used in this installation?arrow_forwardThree capacitors having capacitance values of 20F,40F, and 50F are connected in parallel to a 60 - Hz power line. An ammeter indicates a circuit current of 8.6 amperes. How much current is flowing through the 40F capacitor?arrow_forward
- An RC series circuit is connected to a 120-V, 60-Hz power source. The resistor is 25 and has a voltage drop of 65 volts. What is the capacitance of the capacitor?arrow_forwardIn reference to the load, how are capacitors connected to help prevent voltage spikes and surges? Are capacitors connected in parallel or in series with the load?arrow_forwardA capacitor uses air as a dielectric and has a capacitance of 3 F. A dielectric material is inserted between the plates without changing the spacing, and the capacitance becomes 15 F. What is the dielectric constant of this material?arrow_forward
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