/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Q18 CQ Most electrical appliances are r... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 7: Q18 CQ (page 259)

Most electrical appliances are rated in watts. Does this rating depend on how long the appliance is on? (When off, it is a zero-watt device.) Explain in terms the definition of power.

Short Answer

Expert verified

No, the rating of the electrical appliances does not depend on how long the appliance is on.

Step by step solution

01

Step 1: Definition of Concepts 

Power: Power is the measure that how fast the energy is being consumed or transformed from one form of energy to other.

Mathematically power is given as,

P=Et

Here, P stands for power, E stands for energy used, and t stands for time.

02

Explain units of Power

Power is measured in terms of Watt (W)or Joules per second(Js).

Suppose, if a body is rated with5W which means that it consumes or transforms of energy per second.

Hence, the rating of the electrical appliances does not depend on how long the appliance is on.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Calculate the work done by an 85.0-kg man who pushes a crate 4.00 m up along a ramp that makes an angle of 20.0潞 with the horizontal. (See Figure 7.35.) He exerts a force of 500 N on the crate parallel to the ramp and moves at a constant speed. Be certain to include the work he does on the crate and on his body to get up the ramp.

Figure 7.35 A man pushes a crate up a ramp

In Example 7.7, we calculated the final speed of a roller coaster that descended \(20{\rm{ m}}\) in height and had an initial speed of \(5{\rm{ m}}/{\rm{s}}\) downhill. Suppose the roller coaster had had an initial speed of \(5{\rm{ m}}/{\rm{s}}\) uphill instead, and it coasted uphill, stopped, and then rolled back down to a final point 20m below the start. We would find in that case that it had the same final speed. Explain in terms of conservation of energy.

Using values from Table 7.1, how many DNA molecules could be broken by the energy carried by a single electron in the beam of an old-fashioned TV tube? (These electrons were not dangerous in themselves, but they did create dangerous x rays. Later model tube TVs had shielding that absorbed x rays before they escaped and exposed viewers.)

If the efficiency of a coal-fired electrical generating plant is 35%, then what do we mean when we say that energy is a conserved quantity?

Calculate the power output needed for a 950-kg car to climb a 2.00掳 slope at a constant 30.0 m/s while encountering wind resistance and friction totaling 600 N. Explicitly show how you follow the steps in the Problem-Solving Strategies for Energy.
See all solutions

Recommended explanations on Physics Textbooks

Classical Mechanics

Read Explanation

Wave Optics

Read Explanation

Magnetism and Electromagnetic Induction

Read Explanation

Electromagnetism

Read Explanation

Electricity and Magnetism

Read Explanation

Radiation

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.