A circuit having a 120µF capacitor and a 10kN resistance in series is connected across a 230-V dc supply. Determine the final energy (in Joules) stored in the capacitor.
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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?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.An AC circuit contains a 24 resistor, a 15.9-mH inductor, and a 13.3F capacitor connected in parallel. The circuit is connected to a 240-V, 400-Hz power supply. Find the following values. XL=XC=IR=AIL=AIC=AP=WVARsL=VARsC=IT=AVA=PF=%=
- 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?A small capacitor of 100 pF is charged by a steady current of 1 µA for 1 ms. At that time, the charging circuit is disconnected. a) What is the voltage across the capacitor when the charging finishes? b) A 10 MΩ resistor is connected across the capacitor to discharge it. Sketch a graph of the voltage V across the resistor as a function of time, with appropriate numbers and units marked on the axes.capacitor having capacitance of 10uF is connected with 1k ohm resistor in series. The switch of the DC supply of 10 Volts, closes at t = 0. Compute the following a. Draw a circuit diagram for t- and t+ b. Compute the time constant c. Plot the Voltage with respect to time, showing the behavior of capacitor charging(take at least 10 values of time in seconds to draw a graph).
- a) The current through a pure capacitor is given byi = 28.28cos(314t).Derive an expression for the voltage across the capacitor in the form v = Vm cos(wt) and comment on your answer. b)Estimate the value of the current I and the voltage V in each of the circuits shown in Figure QA1(c) and justify your method of estimation.The circuit in the figure below has been connected for a long time. Let R1 = 7.80 Ω and R2 = 4.20 Ω.(a) What is the potential difference across the capacitor? which is 6.03 (b) If the battery is disconnected from the circuit, over what time interval does the capacitor discharge to one-half its initial voltage? in eed bA. Find the equivalent capacitance of the combination shown in the figure. (C2 = 2µF, C3 = 3µF) B. Determine the charge on each capacitor, if there is a potential difference of 900V C. Determine the voltages across each capacitor
- For the circuit shown in the figure, in which the capacitor is initially fully discharged. If the source voltage V is 17 Volts, the capacitance of capacitor C is 24 mF; and the values of the resistors in Ω are: R1 = 2250 , R2 = 1071 , R3 = 2455 , R4 = 1199 and R5 = 1043 Determine the voltage across the capacitor in Volts after 15 minutes have elapsed since the circuit is energized. ..Q1 (True/False): A) The current through the capacitor is inversely proportional to the derivative of the voltage across it: Is it true or false? B) In a typical electronic circuit the capacitor blocks DC and couplest he AC to the next stage of the circuit: Is it true or false? C) The more the value of the stray capacitance , the better it is: Is it true or false?The capacitor is discharged through a resistor with the resistance R = 10000 Ohm with a relaxation time of 10 ms. What is the capacitance of the capacitor? What is the charge of the capacitor after time 25 ms after the beginning of discharging if the initial charge was 20 nC?