College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Textbook Question
Chapter 18, Problem 5CQ
Figure CQ18.5
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Compute for the voltage Vab in the circuit shown below.
a-
r1
5 Ohms
V1
b-
(A) 10.2117 V
B) 9.6639 V
(C) 10.0167 V
9.7834 V
i1
믐
15 V
ww
r2
3 Ohms
i2
V2
=
8 V
R_LOAD
10 Ohms
r3
*3 Ohms
i3
V3
믐
3 V
...
210 0
a
24 V
50 μ
320 0
First, what is the time constant of the circuit formed when a and c are connected? Give your ans
in ms to 3 significant digits.
Question 17
Next, what is the time constant of the circuit formed when b and c connected? Give your answe
ms to 3 significant digits.
Question 18
Finally, you perform the following sequence of events. The capacitor starts uncharged and the
switch is flipped to connect a and c. The capacitor is charged for 20 ms. The switch is then flipp
to connect b and c, and the capacitor is discharged for 26 ms, at which time the switch is set to
position where it is not in contact with either a or b. What is the voltage on the capacitor? Give
answer to 2 significant digits.
Find the magnitude and direction (up or down) of the current 1 passing through the R, resistor. Start by placing on each
resistor R1, R2 and R3 an arrow showing the direction of the currents /1, I2 and Ig.
R1-6.3 Ω, R26.3 Ω, Rs 3.9 Ω, ε1 -93 V and E-62 ν.
%3D
%3D
(Submit below the magnitude of the current only. Do not give units but present the answer as if the units were in A. Estimated
time for this question is 20 minutes.)
R1
R23
R3
E1
E2
+.
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Chapter 18 Solutions
College Physics
Ch. 18.1 - True or False: While discharging, the terminal...Ch. 18.1 - Why does a battery get warm while in use?Ch. 18.2 - In Figure 18.5, the current is measured with the...Ch. 18.2 - The circuit in Figure 18.5 consists of two...Ch. 18.3 - In Figure 18.8, the current is measured with the...Ch. 18.3 - When the switch is open in Figure 18.8, power Po...Ch. 18.3 - Suppose you have three identical lightbulbs, some...Ch. 18.3 - If the lightbulbs in Quick Quiz 18.7 are connected...Ch. 18.5 - The switch is closed in Figure 18.20. After a long...Ch. 18 - Choose the words that make each statement correct....
Ch. 18 - Given three lightbulbs and a battery, sketch as...Ch. 18 - Suppose the energy transferred to a dead battery...Ch. 18 - A short circuit is a circuit containing a path of...Ch. 18 - Electric current I enters a node with three...Ch. 18 - If electrical power is transmitted over long...Ch. 18 - The following statements are related to household...Ch. 18 - Two sets of Christmas lights are available. For...Ch. 18 - Why is it possible for a bird to sit on a...Ch. 18 - An uncharged series RC circuit is to be connected...Ch. 18 - Suppose a parachutist lands on a high-voltage wire...Ch. 18 - A ski resort consists of a few chairlifts and...Ch. 18 - Embodied in Kirchhoffs rules are two conservation...Ch. 18 - Why is it dangerous to turn on a light when you...Ch. 18 - A battery haring an emf of 9.00 V delivers 117 mA...Ch. 18 - Prob. 2PCh. 18 - A battery with an emf of 12.0 V has a terminal...Ch. 18 - A battery with a 0.100- internal resistance...Ch. 18 - Two resistors, R1 and R2 are connected in series....Ch. 18 - Three 9.0- resistors are connected in series with...Ch. 18 - (a) Find the equivalent resistance between points...Ch. 18 - Consider the combination of resistors shown in...Ch. 18 - Prob. 9PCh. 18 - Consider the circuit shown in Figure P18.10. (a)...Ch. 18 - Consider the circuit shown in Figure P18.11. Find...Ch. 18 - Four resistors are connected to a battery as shown...Ch. 18 - The resistance between terminals a and b in Figure...Ch. 18 - A battery with = 6.00 V and no internal...Ch. 18 - Find the current in the 12- resistor in Figure...Ch. 18 - (a) Is it possible to reduce the circuit shown in...Ch. 18 - (a) You need a 45- resistor, but the stockroom has...Ch. 18 - (a) Find the current in each resistor of Figure...Ch. 18 - Figure P18.19 shows a Wheatstone bridge, a circuit...Ch. 18 - For the circuit shown in Figure P18.20, calculate...Ch. 18 - Taking R = 1.00 k and = 250 V in Figure P18.21,...Ch. 18 - In the circuit of Figure P18.22, the current I1 is...Ch. 18 - In the circuit of Figure P18.23, determine (a) the...Ch. 18 - Four resistors are connected to a battery with a...Ch. 18 - Using Kirchhoffs rules (a) find the current in...Ch. 18 - Figure P18.26 shows a voltage divider, a circuit...Ch. 18 - (a) Can the circuit shown in Figure P18.27 be...Ch. 18 - A dead battery is charged by connecting it to the...Ch. 18 - (a) Can the circuit shown in Figure P18.29 be...Ch. 18 - For the circuit shown in Figure P18.30, use...Ch. 18 - Find the potential difference across each resistor...Ch. 18 - Show that = RC has units of time.Ch. 18 - Consider the series RC circuit shown in Figure...Ch. 18 - An uncharged capacitor and a resistor are...Ch. 18 - Consider a series RC circuit as in Figure P18.35...Ch. 18 - The RC charging circuit in a camera flash unit has...Ch. 18 - Figure P18.37 shows a simplified model of a...Ch. 18 - The capacitor in Figure P18.35 is uncharged for t ...Ch. 18 - What minimum number of 75-W light bulbs must be...Ch. 18 - A 1 150-W toaster and an 825-W microwave oven are...Ch. 18 - Prob. 41PCh. 18 - Prob. 42PCh. 18 - Assume a length of axon membrane of about 0.10 m...Ch. 18 - Consider the model of the axon as a capacitor from...Ch. 18 - Prob. 45PCh. 18 - How many different resistance values can be...Ch. 18 - (a) Calculate the potential difference between...Ch. 18 - For the circuit shown in Figure P18.48, the...Ch. 18 - Figure P18.49 shows separate series and parallel...Ch. 18 - Three 60.0-W, 120-V lightbulbs are connected...Ch. 18 - When two unknown resistors are connected in series...Ch. 18 - The circuit in Figure P18.52a consists of three...Ch. 18 - A circuit consists of three identical lamps, each...Ch. 18 - The resistance between points a and b in Figure...Ch. 18 - The circuit in Figure P18.55 has been connected...Ch. 18 - Prob. 56APCh. 18 - The student engineer of a campus radio station...Ch. 18 - The resistor R in Figure P18.58 dissipates 20 W of...Ch. 18 - A voltage V is applied to a series configuration...Ch. 18 - For the network in Figure P18.60, show that the...Ch. 18 - A battery with an internal resistance of 10.0 ...Ch. 18 - The circuit in Figure P18.62 contains two...Ch. 18 - An electric eel generates electric currents...Ch. 18 - In Figure P18.64, R1 = 0.100 , R2 = 1.00 , and R3...Ch. 18 - What are the expected readings of the ammeter and...Ch. 18 - Consider the two arrangements of batteries and...Ch. 18 - The given pair of capacitors in Figure P18.67 is...Ch. 18 - 2.00-nF capacitor with an initial charge of 5.10 C...
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- When the switch is open in Figure 18.8, power Po is delivered to the resistor R1. When the switch is closed, which of the following is true about the power Pc delivered to R1? (Neglect the internal resistance of the battery.) (a) Pc Po (b) Pc = Po (c) Pc Po Figure 18.8 (Quick Quizzes 18.5 and 18.6)arrow_forwardThe values of the components in a simple series RC circuit containing a switch (Fig. P21.53) are C = 1.00 F, R = 2.00 106 , and = 10.0 V. At the instant 10.0 s after the switch is closed, calculate (a) the charge on the capacitor, (b) the current in the resistor, (c) the rate at which energy is being stored in the capacitor, and (d) the rate at which energy is being delivered by the battery.arrow_forwardrov X 1 One X D21 Cha X Don X BC Brov X 1 One X C A7. X C 1) A X https://bconline.broward.edu/d2l/le/dropbox/554845/811709/DownloadAttachment?fid=72769470 W C A7 X C A7 X (102 X # Two 100 resistors are connected a) in series and b) in parallel to a 24.0 V battery. What is the equivalent resistance of each circuit and the current from the battery? Xarrow_forward
- G ㅇ r1 1 Ohm 15 I www F6 V1 미마 -- A 2002 load receives power from parallel-connected battery cells, as shown in the figure below. Determine the terminal voltage of the parallel- connected battery cells. r2 1 Ohm R_LOAD 20 Ohms V2 B 30℃ Rain sho... ㅁㅁ ②.ENG (7- ENG 10:20 a End Home Insert PrtScr 12V 믐 F7 g 12 V F8 F9 W * F10 F11 F12 "arrow_forward15V a. + AM 10.2. 4 t=0 um 45² 652 im + V 1 ic (t) b. Assume switch has been closed for Find a mathematical expression for Vc it capacitor is initially uncharged and the switch is closed at t = 0. Sketch Vc lt). 20m F a long time. opening Fird an expression for ic immediately after the switch and sketch it.arrow_forwardPROCEDURE: 1. Connect the circuit shown in Fig (6). 2. Measure the currents I1, I2, and I3. Also measure the voltages Vab.Vac and Vbe , list the values in table 1. wwwww 2200 2200 wwwww 220 0 220 a (A.V.O) R 10V-온 R 120 a Fig (5) Fig (6b) wwwww 200 220 0 R 10 V V 1200 Fig (6a) Fig.(7) Rth Vih IL(mA) VL(volt) Calculated Direct Measurement Fig. (5) Measurement using thevenin Equivalent circuit Fig. (7)arrow_forward
- Each resistor in the three circuits in the drawing has the same resistance R, and the batteries have the same voltage V. The values for R and V are 62 and 6.0 V, respectively. Determine the total power delivered by the battery in each of the three circuits. PA PB || || Pc = i R R R www R wwww +1 V Circuit A www R [ R F V Circuit C R R R R www R R www R www V Circuit Barrow_forwarda) What is the magnitude of the current in the 6.002 resistor? 30.0 2 6.00 V b) What is the direction of the current in the 18.02 resistor? Answer with right or left. 18.0 2 c) What is the power dissipated in the 21.02 resistor? 4.00 V 1.50 V 21.0 2 d) What is the voltage drop across the 30.02 resistor? ७00'9arrow_forwardCompute for the voltage Vab in the circuit shown below. a B CARAN Int M BRO me M ㅁ b r1 5 Ohms V1 ww ww 15 V + i1 ㅓ미다 r2 3 Ohms Tiz V2 + 믐 8V AUGAL R_LOAD w 10 Ohms SA commen V ww r3 3 Ohm i3 V3 믐 3V 30°C Rain sho...arrow_forward
- *18. Find the Thévenin equivalent circuit for the portion of the network of Fig. 122 external to the elements between points a and b. I = 0.6 A/90° R. 90 da Xc R₂ Hir 1002 102 L₂ 0.8 260° ob FIG. 122 Problem 18. E = 20 V / 40°arrow_forwardi1 i2 is 16 i3 is The figure shows an electric circuit and currents on some branches along indicated directions. Three of these currents are known; find the other three. i1 = 3 A, iz = -2 A, iz = 5 A, A i4 A is A io ||arrow_forwardConsider currents in the circuits as follows; I, is int he upper branch, I2 in the mid branch and I3 in the bottom branch Find the current in upper and lower branches 2.00 10.00 V a 3.00 0 on 1.00 5.00 V, 4.00 N w 10.00 N Select one: 1 = 0.8 A, I3 = 0.6 A 1 = 0.2 A, I3 = 0.3 A 1 = 0.2 A, I3 = 0.4 A h = 0.8 A, 13 = 0.4 A 1 = 0.3 A, I3 = 0.4 A h = 0.2 A, 13 = 0.6 Aarrow_forward
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