Conceptual Physics: The High School Physics Program
9th Edition
ISBN: 9780133647495
Author: Paul G. Hewitt
Publisher: Prentice Hall
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Textbook Question
Chapter 34, Problem 58A
A car’s headlights dissipate 40 W on low beam and 50 W on high beam. Is there more or less resistance in the high-beam filament?
Expert Solution & Answer
To determine
To find: The find resistance more or less resistance in the high-beam filament.
Explanation of Solution
For a constant voltage supply, the power dissipate in a resistive element is
Since power dissipation is inversely proportional to the resistance, so the high beam has less resistance.
Chapter 34 Solutions
Conceptual Physics: The High School Physics Program
Ch. 34 - What condition is necessary for the flow of heat?...Ch. 34 - What is meant by the term potential? What is meant...Ch. 34 - What condition is necessary for the sustained flow...Ch. 34 - What is electric current?Ch. 34 - What is an ampere?Ch. 34 - What is voltage?Ch. 34 - How many joules per coulomb are given to charges...Ch. 34 - Does charge flow through a circuit or into a...Ch. 34 - Does voltage flow through a circuit, or is voltage...Ch. 34 - What is electric resistance?
Ch. 34 - Is electric resistance greater in a short fat wire...Ch. 34 - What is Ohms law?Ch. 34 - If the resistance of a circuit remains constant...Ch. 34 - If the voltage impressed across a circuit is...Ch. 34 - How does wetness affect the resistance of your...Ch. 34 - Why is it that a bird can perch without harm on a...Ch. 34 - What is the function of the third prong in a...Ch. 34 - Distinguish between DC and AC. Which is produced...Ch. 34 - A diode converts AC to pulsed DC. What electric...Ch. 34 - What are the roles of a diode and a capacitor in...Ch. 34 - What is a typical 'drift' speed of electrons that...Ch. 34 - From where do the electrons originate that flow in...Ch. 34 - What is power?Ch. 34 - Which of these is a unit of power and which is a...Ch. 34 - How many amperes flow through a 60-watt bulb when...Ch. 34 - Rank the circuits below according to the...Ch. 34 - The bulbs shown below are identical. An ammeter is...Ch. 34 - All bulbs are identical in the circuits shown...Ch. 34 - In each of the circuits shown below, a voltmeter...Ch. 34 - All bulbs are identical in the circuit shown to...Ch. 34 - Calculate the current where 10 coulombs of charge...Ch. 34 - Calculate the current of a lightning bolt that...Ch. 34 - Calculate the current in a toaster that has a...Ch. 34 - Calculate the current in the coiled heating...Ch. 34 - Electric socks, popular in cold weather, have a...Ch. 34 - How much current moves through your fingers...Ch. 34 - Calculate the power supplied to an electric...Ch. 34 - Is this label on a household product cause for...Ch. 34 - Do an ampere and a volt measure the same thing, or...Ch. 34 - What happens to the brightness of light emitted by...Ch. 34 - In terms of heating, why are thick wires rather...Ch. 34 - Why is it important that the resistance of an...Ch. 34 - Why will an electric drill operating on a very...Ch. 34 - Your tutor tells you that an ampere and a volt...Ch. 34 - Does more current flow out of a battery than into...Ch. 34 - A simple lie detector consists of an electric...Ch. 34 - Only a small fraction of the electric energy fed...Ch. 34 - Will a lamp with a thick filament draw more...Ch. 34 - Prob. 49ACh. 34 - Will the current in a lightbulb connected to 220 V...Ch. 34 - Which will do more damage—plugging a 110-V...Ch. 34 - If current of one- or two-tenths of an ampere were...Ch. 34 - What is the effect on current if both the voltage...Ch. 34 - In 60-Hz alternating current, how many times per...Ch. 34 - If electrons flow very slowly through a circuit,...Ch. 34 - What unit is represented by (a) joule per coulomb,...Ch. 34 - Two lightbulbs designed for 120-V use are rated at...Ch. 34 - A cars headlights dissipate 40 W on low beam and...Ch. 34 - How much current, in amperes, is in a lightning...Ch. 34 - How much charge flows in a pocket calculator each...Ch. 34 - How much voltage is required to make 2 amperes...Ch. 34 - Use the relationship power=currentvoltage to find...Ch. 34 - The current driven by voltage V in a circuit of...Ch. 34 - Use the equation just derived and show that when a...Ch. 34 - The power of an electric circuit is given by the...Ch. 34 - An electric heater has a heating element of...Ch. 34 - Calculate the resistance of the filament in a...Ch. 34 - A lightbulb is marked ' 120 V, 60 W.' a. What...Ch. 34 - A microwave oven is marked '120 V, 1100 w.' a. How...Ch. 34 - A typical car headlight may put out 50 watts at 12...Ch. 34 - Suppose that an ammeter inserted in series in a...Ch. 34 - The wattage marked on a lightbulb is not an...Ch. 34 - The resistance of a certain wire is 10 ohms. a....Ch. 34 - Calculate the power dissipated in a toaster that...Ch. 34 - Calculate the yearly cost of running a 5-W...
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