In the figure shown the total resistance is 30 kN, and battery's emf is 18 V. If the time constant to be 12.0 µs, calculate (a) the total capacitance of the circuit, (b) the maximum charge to capacitor to acquire, (c) What is voltage across the capacitor, at the instant, the voltage across the resistor is 12 V? (d) What is the current in the circuit expected to be at this instantand (e) What is the time it takes for the voltage across the resistor to reach 12.0 V after the switch is closed? R ww-

In the figure shown the total resistance is 30 kN, and battery's emf is 18 V. If the time constant to be 12.0 µs, calculate (a) the total capacitance of the circuit, (b) the maximum charge to capacitor to acquire, (c) What is voltage across the capacitor, at the instant, the voltage across the resistor is 12 V? (d) What is the current in the circuit expected to be at this instantand (e) What is the time it takes for the voltage across the resistor to reach 12.0 V after the switch is closed? R ww-

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter17: Resistive-inductive Series Circuits

Section: Chapter Questions

Problem 2PA: You are a journeyman electrician working in an industrial plant. Your task is to connect an inductor...

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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?
2. A parallel plate capacitor with a plate area of 0.13 square meters separated by 1 mm is charged to 9 Volts by a battery, which is then disconnected. The plate separation is then increased to 40 mm.A. Using the expression for the capacitance of a parallel plate capacitor, what do you expect the new potential difference across the plates to be after the increase?B. Suppose you measure the potential difference across the plates after the separation and find it to be 30 V (this should be very different from what you found in part A). This unexpected result can be explained by the effects of “stray capacitance” with nearby objects. Assuming that the stray capacitance can be modeled as a capacitor connected in parallel with the parallel plate capacitor, find the value of this stray capacitance.
In the circuit diagram below, the capacitor C is first fully charged by using a 6.0V battery and the two way switch k. It is then discharged through the resistor R. The figure below shows how the charge Q on the capacitor C changes with time during the discharge. Use the graph to answer the following questions: What is the capacitance of the capacitor? Estimate the initial current through the resistor during the discharging process, hence, calculate the resistance of the resistor and the time constant of the circuit. On the same axes, draw graphs to show how the voltage Vc across the capacitor and VR across the resistor vary with time during the charging. Indicate values where appropriate.
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