4. The flux produced in the dielectric of a capacitor is 9 x 10-4 coulomb when th impressed emf is 1,500 volts. What is the capacitance of the capacitor? 5. Calculate the capacitance of a parallel-plate capacitor that consists of 80 glas plates, each one 0.045 in. thick, and 81 sheets of 6.5- by 7.5-in. aluminum fc

4. The flux produced in the dielectric of a capacitor is 9 x 10-4 coulomb when th impressed emf is 1,500 volts. What is the capacitance of the capacitor? 5. Calculate the capacitance of a parallel-plate capacitor that consists of 80 glas plates, each one 0.045 in. thick, and 81 sheets of 6.5- by 7.5-in. aluminum fc

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter25: Surge, Spike, And Lightning Protection

Section: Chapter Questions

Problem 10RQ: In reference to the load, how are capacitors connected to help prevent voltage spikes and surges?...

See similar textbooks

Similar questions

A 15-F AC capacitor is connected in series with a 50 resistor. The capacitor has a voltage rating of 600 WVDC. The capacitor and resistor are connected to a 480-V, 60-Hz circuit. Is the voltage rating of the capacitor sufficient for this connection?
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?
In a pure capacitive circuit, does the current lead or lag the voltage?
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.
Three 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?
A 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?
What is the minimum AC voltage rating of each capacitor in Question 11?
You 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?
In 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?
4. In what form is the energy of a capacitor stored?
Can current flow through a capacitor?
List the five capacitor replacement rules.