A 30 Ohm resistor and 1.673 F capacitor are connected in series to a 60 V DC voltage source (RC Circuit). What will be the charge stored in the capacitor 4.38 seconds after the series is connected?

A heart pacemaker fires exactly 71 times a minute. Each time it fires, a 19.0 nF capacitor is charged by a battery in series with a resistor to 0.582 of its full voltage. What is the value of the resistance R? R =

Ginko has two parallel plates which are uncharged. They are connected to the RC circuit shown below. Ginko knows the following things abaout this RC cuircuit: The C1 capacitor is filled with air, The C1 capacitor has a plate area of 6cm^2, The C1 capacitor has a plate seperation of 0.500mm, The C2 capacitor is filled with with cardborad that has a dielectric constant of 3.7, The C2 capacitor has the same separation as C1, The C2 capacitor has twice the plate area of C1, The switch remained at a for a long time and then was throuwn to b. Figure out the final charge on each capacitor. b C₂ C₁ 18.0 V 2.00 kn Ginko

4. You can easily find the time constant if you are given a graph of voltage across a discharging capacitor as a function of time. When t = Tc = RC, the voltage across the capacitor is AV (t = Tc) = AV, e¹≈ 0.37 AV Therefore the time constant is just how long it takes for AV (t) to reach 37% of its initial value. The graph shows the voltage across a discharging 0.2 μF capacitor as a function of time. Use the following steps to determine the resistance. a. What is 37% of the initial voltage? 21 b. How long does it take (after discharge starts) for the voltage to reach 37% of the initial voltage? This time is equal to the time constant. c. Use your time constant from (b) to determine the resistance. AV (Volts) 2 1.5 0.5 %40 80 120 160 time (milli-sec)

An RC circuit has an unknown resistance and an initially uncharged capacitor of 515 x 10^-6 F. When connected to a source potential, it takes the capacitor 25.5 s to become 90% fully charged. What is the resistance of the circuit? Enter a number rounded to the nearest 100 place.

Figure P18.26 shows a voltage divider, a circuit used to obtain a desired voltage AVout from a source voltage E. Determine the required value of Rg if E = 5.00 V, AVout = 1.50 V, and R = 1.00 x 10 0. (Hint: Use Kirchhoff's loop rule, substi- tuting AVout = IR2, to find the current. Then solve Ohm's law for R2.) R1 R AV out Figure P18.26

The RC circuit shown in (Figure 1) can be used in an artificial pacemaker to establish a normal heart rhythm by generating periodic electrical impulses. The box labeled "controller" behaves as an open circuit until the voltage drop across the capacitor reaches a preset limit. Once that limit is reached, the capacitor discharges its stored energy in the form of an electrical impulse to the heart, starts to recharge, and then the process repeats. Figure + Vs R m C + VC Part A Calculate the heart rate in beats per minute for R = 200 kn and C = 5.0 μF, if the capacitor discharges when its voltage reaches 80% of the source voltage Vs. Express your answer in beats per minute to three significant figures. H = Submit 17 ΑΣΦ V ↓↑ Request Answer < Return to Assignment vec Provide Feedback ? beats per minute

A 1 uF capacitor is connected in series with a 2 uF capacitor and an open switch. Initially, the voltage across the open switch is 12 V and the voltages across the two capacitors are equal. a) b) Draw this circuit, marking on your diagram values of voltage V, charge Q and stored energy E in appropriate places. The switch is now closed. A current will flow, and excess energy will be dissipated in heat in the wires. Make a second diagram showing the final values of the voltages V, charges Q and stored energies, and state the amount of energy dissipated. E