(a) In the figure all the given variables are fixed, with the exception of R. What value must R have to achieve a certain current, i in the circuit? Assume E < E2. (b) What is the rate at which thermal energy appears in R in this case? State your answers in terms of the given variables. R (a)R = %3D ? Edit (b)P, = 2 Edit

(a) In the figure all the given variables are fixed, with the exception of R. What value must R have to achieve a certain current, i in the circuit? Assume E < E2. (b) What is the rate at which thermal energy appears in R in this case? State your answers in terms of the given variables. R (a)R = %3D ? Edit (b)P, = 2 Edit

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter28: Direct-current Circuits

Section: Chapter Questions

Problem 28.14P: (a) When the switch S in the circuit of Figure P28.14 is closed, will the equivalent resistance...

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(a) When the switch S in the circuit of Figure P28.14 is closed, will the equivalent resistance between points a and b increase or decrease? State your reasoning. (b) Assume the equivalent resistance drops by 50.0% when the switch is closed. Determine the value of R.
Consider a series RC circuit as in Figure P28.38 for which R = 1.00 M, C = 5.00 F, and = 30.0 V. Find (a) the time constant of the circuit and (b) the maximum charge on the capacitor after the switch is thrown closed. (c) Find the current in the resistor 10.0 s after the switch is closed.
in the circuit shown in the figure, the S switch is closed at t=0 and the capasitors, which are completely empty, begin to fill. Here E=30V, C=3 uF and R=40 ohm. A) what is the time constant of the circuit, T, in the units of microseconds? B)when t=T, what is the total charge, in units of microcoulomb?
In the circuit below, it is known that R1 = 10 kΩ, R2 = 15 kΩ, and C = 0.4 μF, and a battery with an Emf of 20 Volts. Initially, the connector (switch) is connected for a long time until it reaches a steady state. Then the switch is disconnected/opened at t = 0. What is the current flowing in resistor 2 at t = 4 ms?
A loop circuit has a resistance of R1 and a current of 1.9 A. The current is reduced to1.6 A when an additional 4.8 Ω resistor isadded in series with R1.What is the value of R1? Assume the internal resistance of the source of emf is zero.Answer in units of Ω.
A DC battery provides a constant current of I= 63mA. Assume the battery started with a voltage of V= 11Volts at time t=0 and that the voltage provided by the battery decayed to half of its initial value after a time of t= 149hours. If the voltage provided by the battery decreased linearly over time, find the total energy provided by the battery over the 149 hour time period. Express your answer in units of kJ (kilo-joules).
For the circuit shown below, ε=22 V, L=7.5 mH, and R=6Ω. After steady state is reached with S1 closed and S2 open, at t=0, S2 is closed and S1 is opened. Determine (a) the current through L at t=0, (b) the current through L at t=4.5×10-4 s, (c) the voltage across R on the right at t=4.5×10-4 s, and (d) the rate at which current through L changes at t=4.5×10−4 s. The current through L at t=0 is__________A. The current through L at t=4.5×10-4 s is_____A. The voltage across R at t=4.5×10-4 s is______V. The rate at which current through L changes at t=4.5×10-4 s is______A/s.
How many time constants does it take for a capacitor with capacitance, C, to discharge through a resistor with resistance, R, to 1/5 of its total charge?
When the switch S is toggled to the left, the capacitor C charges through the resistor R. When the switch is toggled to the right, the capacitor discharges current through the patient's torso, modeled as the resistor Rtorso, allowing the heart's normal rhythm to be reestablished. (a) If the capacitor is initially uncharged with C = 7.00 µF and = 1270 V, find the value of R (in ohms) required to charge the capacitor to a voltage of 795 V in 1.70 s. Ω (b) If the capacitor is then discharged across the patient's torso with Rtorso = 1270 Ω, calculate the voltage (in V) across the capacitor after 4.50 ms.
When the switch S is toggled to the left, the capacitor C charges through the resistor R. When the switch is toggled to the right, the capacitor discharges current through the patient's torso, modeled as the resistor Rtorso, allowing the heart's normal rhythm to be reestablished. (a)If the capacitor is initially uncharged with C = 8.25 µF and = 1270 V, find the value of R (in ohms) required to charge the capacitor to a voltage of 755 V in 1.70 s. answer in Ω b) If the capacitor is then discharged across the patient's torso with Rtorso = 1260 Ω, calculate the voltage (in V) across the capacitor after 4.50 ms. answer in V
An uncharged capacitor and a resistor are connected in series to a battery as shown, where ε = 12.0 V, C = 5.00 μF, and R = 8.00 x 105 Ω. The switch is thrown to position a. Find the time constant of the circuit, the maximum charge on the capacitor, the maximum current in the circuit, and the charge and current as functions of time.
The power dissipated in a resistor is given by P=V2/R, which means power decreases if resistance increases. Yet this power is also given by P=I2/R , which means power increases if resistance increases. Explain why there is no contradiction here.