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 24A
Which of these is a unit of power and which is a unit of electrical energy: a watt, a kilowatt, and a kilowatt-hour?
Expert Solution & Answer
To determine
To Identify: Unit of power and electrical energy.
Explanation of Solution
Introduction:
Power is the rate of doing work. Electrical energy is the energy stored in charged particles in an electric field.
Power is measured in watts or kilowatts. Electrical energy is measured in kilowatt-hour.
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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