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 5bTH
Suppose that a switch has been added to the circuit as shown. The switch is initially closed.
When the switch is opened, will the current through bulb Aincrease, decrease, or remain the same? Explain how you determined your answer.
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The resistance of each brake lightbulb on an automobile is 8.7 2. Use the fact that cars have 12-V electrical systems to compute the current that flows in each bulb if they are connected
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Explain the flow of current, voltage, and resistance for each resistor and then for the whole system in the circuit. Give the reasoning.
Solve the following:
1. A certain light bulb has a resistance of 150 when lighted. How much current will flow through it when
connected across a 220 V, its normal operating voltage? Draw the circuit schematic diagram>Fin
2. Find the potential difference (Emf) in a certain electric circuit with current flowing at 18 ampere and a floor
Polisher connected with resistance of 12 ?
3. A 12 volts battery operates a 15 ohms digital scale for 5.2 minutes. a) Find the current flowing b) the charges
Transferred with the given time.
4. What is the resistance of a conductor at 50° C if its resistance at 0°C is 1 ohm and the temperature coefficient
of resistance of 9.8 x 10-³/°C
5. A silver wire has a resistance of 2.3 at 0°C and a temperature coefficient of resistance of 3.75 x 10-³/°C.
What is final temperature when the final resistance is 3.8 ohms. ?
6. Complete the table:
Electric Circuit and Ohm's Law
V, Volts
8 volts
20 volts
10 Volts
36 volts
I, Ampere
2.8 mA
40A
130mA
R, ohms
156 02
25 ΚΩ…
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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