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 3bTH
A wire is now added to the circuit as shown.
i. Does the brightness of bulb C increase, decrease, or remain the same? Explain your reasoning.
ii. Does the brightness of bulb Aincrease, decrease, or remain the same? Explain.
iii. Does the current through the battery increase, decrease or remain the same? Explain.
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Students have asked these similar questions
Consider the following circuit
R1
V
R2
where V = 30V, R2 = 30 and R = 30.
1. Are the resistors connected in series or parallel?
2. What is the equivalent resistance of the resistor pair.
3. Use V = IR and the equivalent resistance to find the total current though the battery.
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4. How much current flows through each of the two original resistors?
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B. The circuit at right has three resistors, R1, R2 and
R2 connected with two ideal batteries. The three
R1
20 Q
currents in each leg of the circuit are labeled as ią, ib,
and i, as shown.
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ic
R2
i.
Apply Kirchhoff's laws to the circuit and write
the three equations that represent the circuit below.
40 Q
R3
80 Q
+
BAT1
9 V
ВАТ2
12 V
ii.
Solve the system of equations to find as ia, ib, and ic. Show your work.
In the circuit shown, A & C are identical light bulbs, and B is a different
bulb. It's a 1.5 V battery.
5a. If we add another bulb, D, of the same type as A & C, into the same
line as C, what will the potential difference across it be? Why?
A
B
5b. Explain whether bulb D will be brighter, dimmer or the same as bulb
C and why.
C
6a. If the potential difference across bulb A is 1V, then what is the potential difference across bulb B?
Explain why.
6b. Will bulb A will be brighter, dimmer or the same as bulb B under the simplifying (but impossible)
assumption of 100% efficient bulbs where all the energy is output to the environment as light and not
heat. Explain why.
6c. What, if anything, changes about your previous answer if bulb B is 100% efficient while bulb A is
50% efficient (so its energy leaves half as light and half as heat). Explain why.
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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