5. Three capacitors are connected to a battery of voltage 20 V. Three capacitors are C, = 7µF, C2 = 12 µF, and C3 = 6µF. The capacitors are not marked. You can take them in any order you want. a) Find the potential difference across each capacitor. b) Find the charge in each capacitor. c) Find the stored energy in each capacitor. d) What is the equivalent capacitance of the combination.
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- 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?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?
- 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?1. Calculate the capacitance between two parallel plates, each of which is 100 sq. Inches and 2 mm apart in air. 2. A capacitor is charged with 0.23 J of energy at a voltage of 48V. What is its capacitance? 3. A 50-uF capacitor is initially charged. Determine the initial charge of the 50-uF capacitor if the charge transferred to a 100-uF capacitor, when connected in parallel, is 200-uC.Two capacitors 10 and 15 μf are in series with two 20 μf capacitors which are connected in parallel to each other. If the emf supplied is 200 V, find (a) the combined capacitance (b) the charge on the 10 μf and (c) the potential drop across the 15 μf capacitor
- >Rank these 3 materials by increasing relative permittivity : Air, Glass, Hard Rubber. ____, ____, ____. >If capacitor has a code of 453D,the nominal value is ____. >The same capacitor has a tolerance of ____. >The time between when a capacitor is fully discharged to when it is fully charged is called the ____time. >Define pole ____and throw ____.The circuit shown in the attached image contains a voltage source with emf ε = 2.99 V, a resistor with resistance R = 135 kΩ, and a capacitor with capacitance C = 612 nF. When switch S is set to position a, the three circuit elements are in series. When the switch is in position b, the battery is excluded from the circuit. The switch is initially moved to position a, where it remains for a sufficiently long time that the capacitor is fully charged. The switch is now moved to position b. What is the magnitude of the instantaneous current, in amperes, through the resistor the instant the switch makes contact with terminal b? With time meausred the instant that switch S is closed in position b, calculate the time, in seconds, when the charge on the capacitor is one-half of its maximum value. Calculate the current through the resistor, in amperes, at time t = 155.5 ms after the switch is closed in position b.A large capacitor of 1000 μF is charged by a steady current of 1 mA until it reaches a voltage of100 V. At that voltage, the charging circuit is disconnected. a) Calculate how long the charging takes. b) A 10 kΩ resistor is connected across the capacitor to discharge it. Sketch a graph of the current I in the resistor as a function of time, with appropriate numbers and units marked on the axes.
- Basic Electrical Engineering1. Derive the formula for the energy stored in a capacitor.2. Derive the formula for the total capacitance of series capacitors.3. Derive the formula for the total capacitance of parallel capacitors.Basic Electrical Engineering: Inductance and Capacitance You find that a 25-µF capacitor connected to a 480 V AC is defective. The storeroom has no capacitors with a 480 V AC rating. However, you find two capacitors rated at 50 µF and 370 V AC. Can these 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 damage to the capacitor.You are given 10 resistors that are each 30 Ω. Construct a circuit with a resistance of exactly85 Ω. don't use all 15 resistors.a.) Explain process in designing the circuit.b.) Draw a diagram of the circuit,c.) Show that the total resistance for the circuit is 85Ω.d.) Suppose capacitors was given instead. Draw a circuit using 15 or fewer30 μ F capacitors, so that the circuit has a total capacitance of 85μF. Briefly explain the process.e.)Show that the total capacitance is 85μF.