Tutorials in Introductory Physics
1st Edition
ISBN: 9780130970695
Author: Peter S. Shaffer, Lillian C. McDermott
Publisher: Addison Wesley
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Textbook Question
Chapter 20.1, Problem 1TH
In tutorial, you compared the relative brightness of the bulbs in the three circuits shown. In the diagrams, boxes have been drawn around the networks of bulbs in each circuit.
On the basis of your observations and the rule you developed in tutorial relating current through the battery to total resistance, rank the networks (boxes) A−C according to their equivalent resistance. Explain your reasoning on the basis of the model. (Do not use math.)
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A circuit is constructed as shown in the diagram to the right. R1 = 22 Ω, R2 = 54 Ω, R3 = 83 Ω, and R4 = 64 Ω.
Write an equation for the equivalent resistance of the circuit in terms of the individual resistances.
Calculate for the equivalent resistance of the circuit in ohms.
The voltage V (volts), current I (amperes), and resistance R (ohms) of an electric circuit like the one shown here are related by the equation V=IR. Suppose that V is
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increasing at the rate of 3 volt/sec while I is decreasing at the rate of amp/sec. Let t denote time in seconds. Answer the following questions.
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b. What is the value of dt?
volt/sec (Simplify your answer.)
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amp/sec (Simplify your answer.)
c. What equation relates to
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OB.
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d. Find the rate at which R is changing when V = 40 volts and 1= 4 amp. Is R increasing or decreasing?
R is changing at ohm/sec. (Simplify your answer.)
Is R increasing or decreasing?
dR
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dR
dt
=
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A circuit contains a source of constant voltage V and two
resistors connected in parallel, as shown in (Figure 1).
Resistor 1 has resistance R1, and resistor 2 has
resistance R2.
Part C
Now consider three resistors in parallel, with resistances R1, R2, and R3, as shown in (Figure 3). Again,
draw a circuit diagram with a single equivalent resistor, with resistance R. What is the value of R?
Figure
1 of 3
Express your answer in terms of R1, R2, and R3.
V ΑΣΦ
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R1
R2
R =
Chapter 20 Solutions
Tutorials in Introductory Physics
Ch. 20.1 - In tutorial, you compared the relative brightness...Ch. 20.1 - Use the model for electric current to rank the...Ch. 20.1 - Rang the brightness of the bulbs. Explain your...Ch. 20.1 - A wire is now added to the circuit as shown. i....Ch. 20.1 - Rank the networks according to their equivalent...Ch. 20.1 - How does adding a single bulb to a circuit in...Ch. 20.1 - How does adding a single bulb to a circuit in...Ch. 20.1 - The network AE above are connected, in turn, to...Ch. 20.1 - Rank the bulbs in order from brightest to dimmest....Ch. 20.1 - Suppose that a switch has been added to the...
Ch. 20.2 - The circuit at right consists of a bulb in series...Ch. 20.2 - The circuit at right consists of a bulb in series...Ch. 20.2 - The circuit at right consists of a bulb in series...Ch. 20.2 - In the circuit at right, the voltage across bulb 1...Ch. 20.2 - Prob. 2bTHCh. 20.2 - Box A and box B are now interchanged. It is...Ch. 20.2 - Consider the circuit as shown. i. Rank bulbs A, B,...Ch. 20.2 - b. A student cuts the write between bulbs A and C...Ch. 20.2 - Consider the following discussion between two...Ch. 20.2 - Rank bulbs 16 in order or brightness. Explain your...Ch. 20.2 - Rank the voltages across the bulbs. Explain your...Ch. 20.2 - Write an equation that relates the voltage across...Ch. 20.2 - Bulb 1 is removed from its socket. i. Does the...Ch. 20.3 - Describe the behavior of the bulb in the two...Ch. 20.3 - A second identical bulb is flow added to the...Ch. 20.3 - Just after the switch is closed: • what is the...Ch. 20.3 - A long time after the switch is closed: • rank the...Ch. 20.3 - Summarize your results by describing the behavior...
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