Tutorials in Introductory Physics
1st Edition
ISBN: 9780130970695
Author: Peter S. Shaffer, Lillian C. McDermott
Publisher: Addison Wesley
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Question
Chapter 20.2, Problem 2bTH
To determine
The resistance of box B compared to the resistance of bulb
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Students have asked these similar questions
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
1
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.
5
dV
dt
=
dl
dt
dl
b. What is the value of dt?
volt/sec (Simplify your answer.)
OA.
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amp/sec (Simplify your answer.)
c. What equation relates to
dR
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dR dV
dt dt
dR
dt
1 dV dl
+V-
I dt
dt
dl
dv
=1+VdT
dt
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and dt?
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
dt
dR
dt
=
1 dv
I'dt
1 (dV
1
dt
V dl
I dt
F
R
www
Applying Kirchoff's Rules
If in the circuit shown, V1 = 4V, V2 = 12V, R1 = 3 Ohms, R2 = 1 Ohm, and R3 = 3 Ohms, the
current I₁ is
amps, the current I2 is
amps, the
current I3 is
decimal point.)
+
V1
R2
amps. (Provide answer with one digit to the right of the
R3
I2
13
R1
www
V2
+
The combined electrical resistance R of two resistors R1 and R2, connected in parallel, is given by the equation below, where R, R1, and R2 are measured in ohms. R1 and R2 are increasing at rates of 0.9 and 2.0 ohms per second, respectively.
1
=
1
+
1
At what rate is R changing when R1 = 37 ohms and R2 = 87 ohms? (Round your answer to three decimal places.)
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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