13. An RC circuit takes = 0.12 s to discharge to 45% when a voltage of AV = 2.5 V is applieda. What is this circuit's time constant 7, in seconds?b. If the circuit has a resistance of R = 6.5 92, what is its capacitance, in farads?

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Answered: 13. An RC circuit takes = 0.12 s to…

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter21: Circuits And Dc Instruments

Section: Chapter Questions

Problem 68PE: A 500- resistor, an uncharged 1.50-F capacitor and a 6.16-V emf are connected in series, (a) What is...

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(a) What is the terminal voltage of a large 1.54-V carbon-zinc dry cell used in a physics lab to supply 2.00 A to a circuit if the cell’s internal resistance is 0.100 ? (b) How much electrical power does the cell produce? (c) What power goes to its load?
(a) What is the internal resistance of a voltage source if its terminal potential drops by 2.00 V when the current supplied increases by 5.00 A? (b) Can the emf of the voltage source be found with the information supplied?
A circuit contains a D-cell battery, a switch, a 20- resistor, and three 20-mF capacitors. The capacitors are connected in parallel, and the parallel connection of capacitors are connected in series with the switch, the resistor and the battery, (a) What is die equivalent capacitance of the circuit? (b) What is the KC time constant? (c) How long before the current decreases to 50% of the initial value once the switch is closed?
A 500- resistor, an uncharged 1.50-F capacitor and a 6.16-V emf are connected in series, (a) What is the initial current? (b) What is the RC time constant? (c) What is the current after one time constant? (d) What is the voltage on the capacitor after one time constant?
Figure P18.26 shows a voltage divider, a circuit used to obtain a desired voltage Vout from a source voltage . Determine the required value of R2 if = 5.00 V, Vout = 1.50 V and R1 = 1.00 103 (Hint: Use Kirchhoff's loop rule, substituting Vout = IR2, to find the current. Then solve Ohms law for R2. Figure P18.26
The circuit in Figure P21.59 has been connected for a long time. (a) What is the potential difference across the capacitor? (b) If the battery is disconnected from the circuit, over what time interval does the capacitor discharge to one-tenth its initial voltage?
An ECG monitor must have an KC time constant lessthan 1.00102s to be able to measure variations involtage oversmall time intervals, (a) If the resistance of the circuit (duemostly to that of the patient's chest) is 1.00kTwhat is the maximum capacitance of the circuit?(b) Would It be difficult in practice to limit the capacitance to less than the value found in (a)?
b. The voltage across the plates of a capacitor at any time t seconds is given by t V(t) = Ve¯RC where V, C and R are constants. Given V = 200 volts, C = 0.1 x 10-6 Farads and R = 4 x 105 ohms. Find i. The initial rate of change of voltage ii. The rate of change of voltage after 0.5 s.
9
C, - 10µF C, = 10µF Oane 12V FIGURE 1 Refer to the figure 1. Two electrolytic capacitors are connected in parallel across a 12-volt supply. What is the total charge of the given circuit? A. 240 μC B. 0.6 μC С. 60 иС D. 720 µC Select one: О а. А O b. B О с. С O d. D
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13. An RC circuit takes = 0.12 s to discharge to 45% when a voltage of AV = 2.5 V is applied a. What is this circuit's time constant 7, in seconds? b. If the circuit has a resistance of R = 6.5 92, what is its capacitance, in farads?