Inquiry into Physics
8th Edition
ISBN: 9781337515863
Author: Ostdiek
Publisher: Cengage
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Textbook Question
Chapter 7, Problem 28P
. A lightbulb is rated at 60 W when connected to 120 V
(a) What current flows through the bulb in this case?
(b) What is the bulb’s resistance?
(c) What would be the current in the bulb if it were connected to 60 V assuming the resistance stays the same?
(d) What would be its power consumption in this case?
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A lightbulb is rated at 75 W when connected to 120 V.
(a) What current flows through the bulb in this case? A(b) What is the bulb's resistance? Ω(c) What would be the current in the bulb if it were connected to 76 V, assuming the resistance stays the same? (d) What would be its power consumption in this case?
In periods of peak demand, power companies lower their voltage. This saves them power (and saves you money!). To see the effect, consider a 1200-W coffeemaker that draws 10 A when connected to 120 V. Suppose the voltage is lowered by 10% to 108 V. By how much does the current decrease? By how much does the power decrease? (Caution: The 1200-W label is valid only when 120 V is applied. When the voltage is lowered, it is the resistance of the toaster, not its power, that remains constant.)
(a) Find the voltage drop in an extension cord having a 0.06 2 resistance and through which 4.5 A is
flowing.
V=
V
(b) A cheaper cord utilizes thinner wire and has a resistance of 0.35 2. What is the voltage drop in it
when 4.5 A flows?
V=
V
(c) Why is the voltage to whatever appliance is being used reduced by this amount? What is the
effect on the appliance?
The voltage supplied to whatever appliance is being used is reduced because the total voltage drop
from the wall to the final output of the appliance is
So, if the voltage drop
across the extension cord is large, the voltage drop across the appliance is significantly
so the power output by the appliance can be significantly
reducing the ability of the appliance to work properly.
Find the power dissipated in each of these extension cords:
(d) an extension cord having a 0.06 resistance and through which 4.5 A is flowing;
P=
✔W
(e) a cheaper cord utilizing thinner wire and with a resistance of 0.35 2.;
P=
W
(f) Which extension cord…
Chapter 7 Solutions
Inquiry into Physics
Ch. 7 - Describe one promising explanation for how...Ch. 7 - Loud thunder claps frequently accompany lightning...Ch. 7 - What does the term fibrillation mean in connection...Ch. 7 - Prob. 1PIPCh. 7 - Prob. 2PIPCh. 7 - Prob. 1MIOCh. 7 - Prob. 2MIOCh. 7 - Prob. 1QCh. 7 - Prob. 2QCh. 7 - Prob. 3Q
Ch. 7 - Prob. 4QCh. 7 - Prob. 5QCh. 7 - (Indicates a review question, which means it...Ch. 7 - Prob. 7QCh. 7 - Prob. 8QCh. 7 - Prob. 9QCh. 7 - Prob. 10QCh. 7 - Prob. 11QCh. 7 - Prob. 12QCh. 7 - (Indicates a review question, which means it...Ch. 7 - Prob. 14QCh. 7 - (Indicates a review question, which means it...Ch. 7 - Prob. 16QCh. 7 - (Indicates a review question, which means it...Ch. 7 - (Indicates a review question, which means it...Ch. 7 - Prob. 19QCh. 7 - (Indicates a review question, which means it...Ch. 7 - (Indicates a review question, which means it...Ch. 7 - (Indicates a review question, which means it...Ch. 7 - (Indicates a review question, which means it...Ch. 7 - Prob. 24QCh. 7 - Prob. 25QCh. 7 - (Indicates a review question, which means it...Ch. 7 - (Indicates a review question, which means it...Ch. 7 - (Indicates a review question, which means it...Ch. 7 - Prob. 29QCh. 7 - (Indicates a review question, which means it...Ch. 7 - (Indicates a review question, which means it...Ch. 7 - Prob. 32QCh. 7 - Prob. 33QCh. 7 - Prob. 34QCh. 7 - (Indicates a review question, which means it...Ch. 7 - Two charged particles exert an electric force of...Ch. 7 - What would the separation between two identical...Ch. 7 - A particle having a positive charge of C...Ch. 7 - During 30 seconds of use, 250 C of charge flow...Ch. 7 - A lightning stroke lasts 0.05 s and involves a...Ch. 7 - A current of 0.7 A goes through an electric motor...Ch. 7 - A calculator draws a current of 0.0001 A for 5...Ch. 7 - Prob. 8PCh. 7 - A 120-V circuit in a house is equipped with a 20-A...Ch. 7 - . The resistance of each brake lightbulb on an...Ch. 7 - . The lightbulb used in a computer projector has a...Ch. 7 - Prob. 12PCh. 7 - Prob. 13PCh. 7 - Prob. 14PCh. 7 - . An electric eel can generate a 400-V, 0.5-A...Ch. 7 - . An electric train operates on 750 V. What is its...Ch. 7 - . All of the electrical outlets in a room are...Ch. 7 - . Your cell phone typically consumes about 400 mW...Ch. 7 - . A car’s headlight consumes 40 W when on low beam...Ch. 7 - . Find the current that flows in a 40-W bulb used...Ch. 7 - . An electric clothes dryer is rated at 4,000 W....Ch. 7 - . A clock consumes 2 W of electrical power. How...Ch. 7 - . Which costs more, running a 1,200-W hair dryer...Ch. 7 - . A representative lightning strike is caused by a...Ch. 7 - Prob. 25PCh. 7 - . A certain electric motor draws a current of 10 A...Ch. 7 - . The generator at a large power plant has an...Ch. 7 - . A lightbulb is rated at 60 W when connected to...Ch. 7 - . About 40,000 J of energy is stored in a typical...Ch. 7 - . An electric car is being designed to have an...Ch. 7 - Prob. 31PCh. 7 - Compute the electric force acting between the...Ch. 7 - Use the result from Challenge land the equation...Ch. 7 - Prob. 3CCh. 7 - Using your understanding of the nature of internal...Ch. 7 - The current that flows through an incandescent...Ch. 7 - Prob. 6CCh. 7 - Imagine a company offering a line of hair dryers...Ch. 7 - Prob. 8CCh. 7 - Combine Ohm’s law and the equation for power...Ch. 7 - A defibrillator sends approximately 0.1 C of...
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