EBK PHYSICS
5th Edition
ISBN: 8220103026918
Author: Walker
Publisher: PEARSON
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Textbook Question
Chapter 21, Problem 46PCE
Find the equivalent resistance between points A and B shown in Figure 21-42.
Figure 21-42
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94 Figure 27-79 shows three 20.0 2
resistors. Find the equivalent resist-
ance between points (a) A and B, (b)
A and C, and (c) B and C. (Hint: A
Imagine that a battery is connected
between a given pair of points.)
Figure 27-79 Problem 94.
A flashlight bulb rated at 2.0 W and 3.0 V is operated by
a 9.0-V battery. To light the bulb at its
rated voltage and power, a resistor R is
connected in series as shown
in Fig. 19–85. What value
should the resistor have?
R
FIGURE 19-85
Problem 87.
9.0 V
Additional Problems
70 Go Each of the six real batteries in
Fig. 27-68 has an emf of 20 V and a resistance
of 4.0 n. (a) What is the current through the
(external) resistance R = 4.0 0? (b) What is
the potential difference across each battery?
(c) What is the power of each battery? (d) At
what rate does each battery transfer energy
to internal thermal energy?
Figure 27-68
Problem 70.
Chapter 21 Solutions
EBK PHYSICS
Ch. 21.1 - Enhance Your Understanding 1. The following...Ch. 21.2 - Enhance Your Understanding 2. If the voltage and...Ch. 21.3 - Enhance Your Understanding 3. In the following...Ch. 21.4 - The two circuits shown in Figure 21-17 have...Ch. 21.5 - Prob. 5EYUCh. 21.6 - Do two capacitors give a larger equivalent...Ch. 21.7 - Give a symbolic expression for the current that...Ch. 21 - Your body is composed of electric charges. Does it...Ch. 21 - Suppose you charge a comb by rubbing it through...Ch. 21 - An electron moving through a wire has an average...
Ch. 21 - Are car headlights connected in series or...Ch. 21 - Is it possible to connect a group of resistors of...Ch. 21 - What physical quantity do resistors connected in...Ch. 21 - What physical quantity do resistors connected in...Ch. 21 - Explain how electrical devices can begin operating...Ch. 21 - Explain the difference between resistivity and...Ch. 21 - Explain why birds can roost on high-voltage wires...Ch. 21 - Consider the circuit shown in Figure 21-36, in...Ch. 21 - A flashlight bulb carries a current of 0.38 A for...Ch. 21 - Predict/Calculate A car battery does 360 J of work...Ch. 21 - Highly sensitive ammeters can measure currents as...Ch. 21 - A television set connected to a 120-V outlet...Ch. 21 - BIO Pacemaker Batteries Pacemakers designed for...Ch. 21 - A conducting wire is quadrupled in length and...Ch. 21 - Figure 21-37 shows a plot of current versus...Ch. 21 - Predict/Explain Current-versus-voltage plots for...Ch. 21 - Prob. 9PCECh. 21 - When a potential difference of 12 V is applied to...Ch. 21 - Prob. 11PCECh. 21 - Prob. 12PCECh. 21 - Transcranial Direct-Current Stimulation In a tDCS...Ch. 21 - The four conducting cylinders shown in Figure...Ch. 21 - Predict/Calculate A bird lands on a bare copper...Ch. 21 - Prob. 16PCECh. 21 - Predict/Calculate BIO Current Through a Cell...Ch. 21 - Prob. 18PCECh. 21 - Prob. 19PCECh. 21 - BIO Resistance and Current in the Human Finger The...Ch. 21 - If a potential difference V is maintained between...Ch. 21 - Light A has four times the power rating of light B...Ch. 21 - Two lightbulbs operate on the same potential...Ch. 21 - Problems and Conceptual Exercises Section 21-3...Ch. 21 - A 65-V generator supplies 4.8 kW of power. How...Ch. 21 - A portable CD player operates with a current of 18...Ch. 21 - Find the power dissipated in a 22- electric heater...Ch. 21 - The current in a 120-V reading lamp is 2.6 A. If...Ch. 21 - Circuit A in a house has a voltage of 208 V and is...Ch. 21 - Predict/Calculate A 65-W lightbulb operates on a...Ch. 21 - Rating Car Batteries Car batteries are rated by...Ch. 21 - Predict/Explain A dozen identical lightbulbs are...Ch. 21 - A circuit consists of three resistors, R1 R2 R3,...Ch. 21 - Predict/Explain Two resistors are connected in...Ch. 21 - What is the minimum number of 88- resistors that...Ch. 21 - Find the equivalent resistance between points A...Ch. 21 - A 9.00-V battery is connected across the terminals...Ch. 21 - Holiday Lights In a string of holiday lights, 50...Ch. 21 - Your toaster has a power cord with a resistance of...Ch. 21 - Prob. 40PCECh. 21 - Predict/Calculate Three resistors, 11, 53 , and R,...Ch. 21 - A circuit consists of a battery connected to three...Ch. 21 - Predict/Calculate Three resistors, 22 , 67 , and...Ch. 21 - Prob. 44PCECh. 21 - The equivalent resistance between points A and B...Ch. 21 - Find the equivalent resistance between points A...Ch. 21 - How many 23-W lightbulbs can be connected in...Ch. 21 - The circuit in Figure 21-43 includes a battery...Ch. 21 - Predict/Calculate A 12-V battery is connected to...Ch. 21 - Predict/Calculate The terminals A and B in Figure...Ch. 21 - Predict/Calculate Suppose the battery in Figure...Ch. 21 - Predict/Calculate The current flowing through the...Ch. 21 - Predict/Calculate Four identical resistors are...Ch. 21 - Find the magnitude and direction (clockwise or...Ch. 21 - Predict/Calculate Suppose the polarity of the...Ch. 21 - Predict/Calculate It is given that point A in...Ch. 21 - Consider the circuit shown in Figure 21-47. Find...Ch. 21 - Suppose point A is grounded (V = 0) in Figure...Ch. 21 - Predict/Calculate (a) Find the current in each...Ch. 21 - Two batteries and three resistors are connected as...Ch. 21 - Two capacitors, C1 = C and C2 = 2C, are connected...Ch. 21 - Predict/Explain Two capacitors are connected in...Ch. 21 - Predict/Explain Two capacitors are connected in...Ch. 21 - A 252-F capacitor is connected in series with a...Ch. 21 - A 36-F capacitor is connected in parallel with an...Ch. 21 - Find the equivalent capacitance between points A...Ch. 21 - A 15-V battery is connected to three capacitors in...Ch. 21 - Three different circuits, each containing a switch...Ch. 21 - Terminals A and B in Figure 21-50 are connected to...Ch. 21 - Predict/Calculate You would like to add a second...Ch. 21 - Two capacitors, one 7.5 F and the other 15 F, are...Ch. 21 - The equivalent capacitance of the capacitors shown...Ch. 21 - With the switch in position A, the 11.2-F...Ch. 21 - The switch on an RC circuit is closed at t = 0....Ch. 21 - The capacitor in an RC circuit (R = 120 , C = 45...Ch. 21 - Three RC circuits have the emf, resistance, and...Ch. 21 - Consider an RC circuit with = 12.0 V, R = 195 ,...Ch. 21 - The resistor in an RC circuit has a resistance of...Ch. 21 - A flash unit for a camera has a capacitance of...Ch. 21 - Figure 21-54 shows a simplified circuit for a...Ch. 21 - Nerve Impulse Propagation The speed with which...Ch. 21 - Predict/Calculate Consider the RC circuit shown in...Ch. 21 - CE Consider the circuit shown in Figure 21-56, in...Ch. 21 - CE Predict/Explain (a) Referring to Problem 83 and...Ch. 21 - CE Consider the circuit shown in Figure 21-57, in...Ch. 21 - CE Predict/Explain (a) When the switch is closed...Ch. 21 - Suppose that points A and B in Figure 21-41 are...Ch. 21 - CE The circuit shown in Figure 21-58 shows a...Ch. 21 - CE The three circuits shown in Figure 21-59 have...Ch. 21 - Electrical Safety Codes For safety reasons,...Ch. 21 - A portable CD player uses a current of 7.5 mA at a...Ch. 21 - An electrical heating coil is immersed in 6.6 kg...Ch. 21 - Predict/Calculate Consider the circuit shown in...Ch. 21 - Prob. 94GPCh. 21 - BIO Pacemaker Pulses A pacemaker sends a pulse to...Ch. 21 - Three resistors (R,12R,2R) are connected to a...Ch. 21 - Predict/Calculate Suppose we connect a 12.0-V...Ch. 21 - National Electric Code In the United States, the...Ch. 21 - Solar Panel Power The current-versus-voltage plot...Ch. 21 - Predict/Calculate A 15.0-V battery is connected to...Ch. 21 - When two resistors, R1 and R2, are connected in...Ch. 21 - The circuit shown in Figure 21-62 is known as a...Ch. 21 - BIO Footwear Safety The American National...Ch. 21 - BIO Footwear Safety The American National...Ch. 21 - BIO Footwear Safety The American National...Ch. 21 - The standard specifies that footwear should be...Ch. 21 - Referring to Example 21-13 Suppose the three...Ch. 21 - Referring to Example 21-13 Suppose R1 = R2 = 225 ...Ch. 21 - Predict/Calculate Referring to Example 21-18...Ch. 21 - Predict/Calculate Referring to Example 21-18...
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- Page of 8 4 Reference figure for N. 13-15. Three resistors are connected as shown in the figure. The potential difference between points A and B is 26 V. 2.0 2 3.0 2 4.0 2 N. 13. What is the equivalent resistance between the points A and B? A) 3.8 Q B) 4.3 Q C) 5.1 Q D) 6.8 Q E) 9.0 0 Ans: B N. 14. How much current flows through the 3-0 resistor? A) 2.0 A B) 4.0 A C) 6.0 A D) 8.7 A E) 10.0 A Ans: C N. 15. How much current flows through the 2-Q resistor? A) 2.0 A B) 4.0 A C) 6.0 A D) 8.7 A E) 10.0 A Ans: B DELL F10 F11 F12 PrtScr Insert Delete F4 F5 F6 F7 F8 F9arrow_forwardItem 15 Now we will consider some slightly different related scenarios to Example 21-18. Part A Example 21-18 depicts the following scenario. A circuit consists of a resistor R₁ = 126-, a resistor R₂ = 275-, a capacitor C = 182-μF, a switch, and an € = 3.00-V battery all connected in series. Initially the capacitor is uncharged and the switch is open. At time t=0 the switch is closed. increase decrease stay the same 3.00 V Suppose the resistance of the 126-2 resistor is reduced by a factor of 2. Assume everything else in the problem remains the same. Does the final value of the charge on the capacitor increase, decrease, or stay the same? Submit Request Answer ww 126 Ω 182 μF HH 275 Ω < 15 of 15 Reviewarrow_forwardFigure 19–44 shows three identical bulbs in a circuit. What happens to the brightness of bulb A if you replace bulb B with a short circuit? A (a) Bulb A gets brighter. (b) Bulb A gets dimmer. (c) Bulb A's brightness does not change. (d) Bulb A goes out. C FIGURE 19-44 B MisConceptual Question 6. Varrow_forward
- 14 O In Fig. 27-32a, both batteries have emf & = 1.20 V and the external resistance R is a variable resistor. Figure 27-32b gives the electric potentials V between the terminals of each battery as func- tions of R: Curve 1 corresponds to battery 1, and curve 2 corre- sponds to battery 2. The horizontal scale is set by R, = 0.20 2. What is the internal resistance of (a) battery 1 and (b) battery 2? 0.5 -0.3 R (2) (a) (6) (A)Aarrow_forwardTe-Learning Portal Courses - Reports e-Services ▼ Academic Departments - ETC - CIMS Salim During an experiment to verify Ohm's law, the voltage supplied and the current through a circuit are measured. [Voltage is measured in Volt (V) and current in Ampere (A)]. ww R on Battery The measured value of the current is I = 3.1 ± 0.2 A and that of the voltage is V = 14 0.5 V. The resistance of the circuit (in N) can be calculated using the formula, R = V/I, Calculate the, a) Resistance (in 2) = b) Fractional uncertainty in the resistance = c) Absolute uncertainty (in 2) in the resistance=arrow_forwardwww www LESSON 8 PARALLEL CIRCUIT/NETWORK (Resistors in Parallel) Example 11: Two resistors of Resistances 8 2 and 16 2, are connected in parallel across a battery having a Voltage of 20 V. Determine: (a the Total Circuit Resistance, and (b) the Current flowing in the 82 resistor. R, R 20 V 8 Ohms 16 Ohms 323 2/3/20arrow_forward
- -> موعد التسلیم اليوم، 01 م A two conductor street main AB , 500 meters in length is fed from both end at 250 volts. Load of 50A, 60A, 40A and 30A are tat distance of 100m , 250m ,250m, 350m, and 400 m from A ,respectively .lf the x-section of the conductors be 1 cm2 and specific resistance of the material of the conductor is 1.7x10-8 Q-m, determine the minimum consumer voltage. äbäi 1..arrow_forwardThree resistors are connected as shown in the figure. The potential difference between points A and B is 26 V. 2.02 3.0 2 4.02 Reference: Ref 20-3 What is the equivalent resistance between the points A and B? 4.3 Q O 9.0 2 O 3.8 2 5.1 Q 6.8 Qarrow_forwardCheck Your Understanding If you place a wire directly across the two terminal of a battery, effectively shorting out the terminals, the battery will begin to get hot. Wiry do you suppose this happens?arrow_forward
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