A capacitor may open if you: Select one: discharge it too fast. apply voltage in excess of the rating. allow it to remain in a discharged condition. connect it in a circuit with an inductor.
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A capacitor may open if you:
Select one:
- discharge it too fast.
- apply voltage in excess of the rating.
- allow it to remain in a discharged condition.
- connect it in a circuit with an inductor.
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- 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?4. In what form is the energy of a capacitor stored?Can current flow through a capacitor?
- 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?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?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.
- You are an electrician working in an industrial plant. You discover that the problem with a certain machine is a defective capacitor. The capacitor is connected to a 240-volt AC circuit. The information on the capacitor reveals that it has a capacitance value of 10 mF and a voltage rating of 240 VAC. The only 10-mF AC capacitor in the storeroom is marked with a voltage rating of 350 WVDC. Can this capacitor be used to replace the defective capacitor? Explain your answer.You are a journeyman electrician working in an industrial plant. Your task is to connect an inductor to a 480-V, 60-Hz line. To determine the proper conductor and fuse size for this installation, you need to know the amount of current the inductor will draw from the line. The nameplate on the inductor indicates that it has an inductance of 0.1 H. An ohmmeter reveals that it has a wire resistance of 10 . How much current should this inductor draw when connected to the line?An uncharged capacitor and bulb are connected in series with a battery. Describe and explain what happens to thebulb when the switch is closed. What determines when the capacitor stops charging? What happens if the capacitoris turned around after the switch has been closed a long time? Include where charge is flowing the circuit. Alsodescribe the different roles of the capacitor and the battery.
- You are modifying the design of an existing inductor and want the inductance to be 1/2 of it's current value. You could achieve this by which of the following options. Select all that apply. Question 1 options: Decreasing the number of windings by a factor of 2. Decreasing the length of the inductor by a factor of 2. Increasing the area of the inductor by a factor of 2. Increasing the number of windings by a factor of 2. None of the other responses are correct.The following figure represents an RC-Circuit with the switch. In Figure A, the capacitor is initially uncharged. In Figure B, the capacitor is initially fully charged. 1) Draw and label the current direction immediately after the switch is closed for each figure. 2) Consider Figure A. What is the voltage across the capacitor as t → 0? Explain. 3) Consider Figure B. Is the voltage across the resistor increasing, decreasing or staying the same as t → 0? Explain. A) B) R Ca) With switch J2 open, close switch J1. Estimate the time it takes to do it. Obtain the equations for the voltage and current of the capacitor. Determine the energy stored by the capacitor. b) Open switch J1, close switch J2. Estimate the time it takes to do it. Obtain the equations for the voltage and current of the capacitor.