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 20.2, Problem 3cTH
Consider the following discussion between two students regarding the change in the circuit when the wire in the circuit is cut (part b):
Student 1: | “I think that bulb B will get brighter. Bulb B used to share the current with bulb C, but now it gets all the current. So bulb B will get brighter.” |
Student 2: | “I don’t think so. Now there aren’t as many paths for the current, so the resistance in the circuit has increased. Since the resistance in the circuit has gone up, the current in the circuit decreases. Bulb B will get dimmer.” |
i. Is Student 1 correct? Why or why not?
ii. Is Student 2 correct? Why or why not?
iii. Use what you have learned about voltage to determine whether bulb B will become brighter, become dimmer, or stay the same brightness when the wire is cut. Explain how you determined your answer.
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Consider the circuit shown in the figure(Figure 1). Suppose the four resistors in this circuit have the values R1= 13 Ω, R2= 6.4 Ω, R3= 6.3 Ω, and R4= 14 Ω, and that the emf of the battery is E= 18 V.
Part A: Find the current through each resistor using the rules for series and parallel resistors.
Part B: Find the current through each resistor using Kirchhoff's rules.
1. In Module 4, we learned the concept of electric current and resistance. Most circuits have
more than one resistor, often connected in series, parallel, or combination of series and
parallel.
(a) Imagine a circuit with two identical bulbs connected one after the other (in series) as
shown. Discuss how the brightness of the two bulbs will compare to the brightness of
an identical bulh in a single-bulb circuit. Explain your
reasoning.
(b) Now consider the circuit pictured to the right with the circuit branching to two bulbs
and back again. (Two bulbs connected in this way are said to be in parallel.) Discuss
how the brightness of the two bulbs will compare to the brightness of an identical
bulb in a single-bulb circuit. Explain your reasoning.
On the basis of your second set of data, are there any patterns to the way that currents behave in a parallel circuit? At this time you should be able to write the general characteristics of currents, voltages and resistances in parallel circuits.
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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