Log out Go to App
Go to App

Learning Materials

Features

Discover

Chapter 32: Q. 35 (page 925)

A resistor dissipates 2.0Wwhen the rms voltage of the emf is10.0V. At what rmsvoltage will the resistor dissipate 10.0W?

Short Answer

Expert verified

The rmsvoltage of the resistor at P=10Wis =105V.

Step by step solution

01

Given information.

We have been given that,

P1=2ohmP2=10ohmVrms1=10V

We have to findVrms2.

02

Simplify.

We use the formula ,

P=(Vrms)2R

We have to findVrms2,

P1P2=(Vrms1)2(Vrms2)2

(Vrms2)2=(Vrms1)2P2P1

(Vrms2)2=(10)2102 (Substitutingthevalues)

(Vrms2)2=100×5

(Vrms2)=105V

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.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

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

The current lags the emf by 30° in a series RLC circuit with E0=10V and R=50Ω. What is the peak current through the circuit?

A generator consists of a 12cm by 16cmrectangular loop with 500 turns of wire spinning at 60Hzz in a 25mTuniform magnetic field. The generator output is connected to a series RC circuit consisting of a120ohm resistor and a 35mF capacitor. What is the average power delivered to the circuit?

A series RLC circuit consists of a 50Ωresistor, a 3.3mHinductor, and a 480nFcapacitor. It is connected to a localid="1650490479345" 3.0kHzoscillator with a peak voltage of localid="1650490469008" 5.0V. What is the instantaneous emf Ewhen

a.i=I?

b. i=0Aand is decreasing?

c. i=-I

Commercial electricity is generated and transmitted as three-phase electricity. Instead of a single emf E=E0cosvt, three separate wires carry currents for the emfs E1=E0cosvt,E2=E0cos1vt+120°,andE3=E0cos1vt-120°. This is why the long-distance transmission lines you see in the countryside have three parallel wires, as do many distribution lines within a city.

a. Draw a phasor diagram showing phasors for all three phases of a three-phase emf.

b. Show that the sum of the three phases is zero, producing what is referred to as neutral. In single-phase electricity, provided by the familiar electric outlets in your home, one side of the outlet is neutral, as established at a nearby electrical substation. The other, called the hot side, is one of the three phases. (The round opening is connected to ground.)

c. Show that the potential difference between any two of the phases has the rms value where is the familiar single-phase rms voltage. Evaluate this potential difference for . Some high-power home appliances, especially electric clothes dryers and hot-water heaters, are designed to operate between two of the phases rather than between one phase and neutral. Heavy-duty industrial motors are designed to operate from all three phases, but full three-phase power is rare in residential or office use.

The resonance frequency of a series RLC circuit is less than the EMF frequency. Does the current lead or lag the EMF? Explain.
See all solutions

Recommended explanations on Physics Textbooks

Further Mechanics and Thermal Physics

Read Explanation

Magnetism and Electromagnetic Induction

Read Explanation

Measurements

Read Explanation

Electrostatics

Read Explanation

Space Physics

Read Explanation

Electric Charge Field and Potential

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.

Sign-up for free