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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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 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.
O C.
amp/sec (Simplify your answer.)
c. What equation relates to
dR
dt
dR dV
dt dt
dR
dt
1 dV dl
+V-
I dt
dt
dl
dv
=1+VdT
dt
dl
and dt?
OB.
O D.
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
The combined electrical resistance R of two resistors R, and R. connected in parallel, is given by the equation below, where R, R₁, and are measured in ohms. R₁ and R, are increasing at rates of 0.5 and 2.0 ohms per second, respectively.
1 1 1
R₁+R₂
At what rate is R changing when R, 32 ohms and R₂ = 75 ohms? (Round your answer to three decimal places.)
0.573
xohm/sec
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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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