3. For the circuit, (i) Find the voltage vc and the current ic if the capacitor was initially uncharged and the switch is thrown into position A. (ii) Find the voltage vc and the current ic if the switch is thrown into position B. (iii) Plot the waveforms for the questions (i) and (ii) for both the voltage vc and the current ic. Mark the time constant for part (i) and part (ii) in the waveforms with the corresponding values for current and voltage. A 20 k. PB + | 12 V R2 10 kn 0.05 µF

3. For the circuit, (i) Find the voltage vc and the current ic if the capacitor was initially uncharged and the switch is thrown into position A. (ii) Find the voltage vc and the current ic if the switch is thrown into position B. (iii) Plot the waveforms for the questions (i) and (ii) for both the voltage vc and the current ic. Mark the time constant for part (i) and part (ii) in the waveforms with the corresponding values for current and voltage. A 20 k. PB + | 12 V R2 10 kn 0.05 µF

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter20: Capacitance In Ac Circuits

Section: Chapter Questions

Problem 2PA: You are working in an industrial plant. You have been instructed to double the capacitance connected...

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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 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.
Assume that the current flow through the resistor, IR, is 15 A; the current flow through the inductor, IL is 36 A; and the circuit has an apparent power of 10,803 VA. The frequency of the AC voltage is 60 Hz. ET ER EL IT IR15A IL36A Z R XL VA10,803 P VARSL PF L
Assume that the voltage drop across the resistor, ER, is 78 V, that the voltage drop across the inductor, EL, is 104 V, and the circuit has a total impedance, Z, of 20 . The frequency of the AC voltage is 60 Hz. ETITZ20VAPFER78VIRRPEL104VILXLVARsLL
In the circuit shown below, S1 is opened and S2 is closed simultaneously. Determine (a) the frequency of the resulting oscillations, (b) the maximum charge on the capacitor, (c) the maximum current through the inductor, and (d) the electromagnetic energy of the oscillating circuit.
a. Find the mathematical expressions for the transient behavior of the voltage vC and the current iC if the capacitor was initially unchargedand the switch is thrown into position 1 at t = 0 s.b. Find the mathematical expressions for the voltage vC and the current iCif the switch is moved to position 2 at t = 3 ms.c. Find the mathematical expressions for the voltage vC and the current if the switch is thrown into position 3 at t =5 ms.d. Plot the waveforms obtained in parts (a)–(c) Demonstrate all necessary steps, formulas and calculations properly.
Draw the inductance and resistance voltages on an oscilloscope screen in accordance with their polarity. In the drawing, it should start with voltage changes and values and should be stable. Write the Time/Div and Volt/Div steps made on the oscilloscope during the measurement on the oscilloscope screen drawing. Specify the voltage labels in the drawing. The current through the circuit has the same variation as the resistor voltage measured from the equation V=I/R, but is 1/47 times the value.
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Please determine if each question is True. If false, please explain why a) A fully charged capacitor behaves identically to a break in the wire (i.e. no current passes through it).b) An uncharged capacitor behaves identically to a break in the wire (i.e. no current passes through it).c) Whether charging or discharging a capacitor, the charge on the capacitor can be modeled using an exponentiallyincreasing function.
a. Find the mathematical expressions for the transient behavior of thevoltage vC and the current iC if the capacitor was initially unchargedand the switch is thrown into position 1 at t = 0 s.b. Find the mathematical expressions for the voltage vC and the current iCif the switch is moved to position 2 at t = 3 ms.c. Find the mathematical expressions for the voltage vC and the current if theswitch is thrown into position 3 at t =5 ms.d. Plot the waveforms obtained in parts (a)–(c)
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Ex : For the circuit shown in the figure below : 1. Find the mathematical expression for the transient behaviour of the voltage across the capacitor as well as the current of the capacitor if the capacitor was initially uncharged and the switch is closed at position 1 when t - o sec . 2. Find the mathematical expression for Vc and is if the switch is moved to position 2 at t = 10msec . 3. Find the mathematical expressions for Vc and ic if the switch is moved to position 3 at t = 20msec 4. Plot the waveforms of the Vc and is obtained from the parts 1 to 3 . R ic 20 kΩ 20 E 12 V C 0.05 uF vc R , 310 ΚΩ T