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FAU / Physics / PHY 2054 / What is the unit of energy density?

What is the unit of energy density?

What is the unit of energy density?

Description

School: Florida Atlantic University
Department: Physics
Course: College Physics 2
Professor: Luc wille
Term: Fall 2018
Tags: Physics
Cost: 50
Name: College Physics II
Description: This study guide covers what will be on your upcoming exam
Uploaded: 10/14/2018
3 Pages 128 Views 2 Unlocks
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Physics Exam Three Study GuideDon't forget about the age old question of What are the gender differences in motor skills?

If you want to learn more check out What year did the second industrial revolution take place?

This exam will be covering material from Chapters 22 through 24. In addition to the material given to you during lecture. I will be providing this study guide to help better understand all concept information you should know for your upcoming exam.

Chapter 22

Transformers: Change voltage but are unable to change energyDon't forget about the age old question of What refers to the effects of electric charge?

- Transformers contain two coils that surround an iron core

Transformers Equation: 

If you want to learn more check out What type of economy did ussr have?

If you want to learn more check out What kinds of roles define group dynamics in sport?

Primary (Np) Vs Secondary (Ns) Coilings:

Ns>Np⬜Vs>Vp (Steps up Voltage)We also discuss several other topics like How many electron pairs around central atom?

Ns<Np⬜Vs<Vp (Steps down Voltage)

Formulas to be familiar with:

V=IR and P=IV

Test Example question:

The Np value given to you is equal to 300 while the Ns value is equal to 20. What occurs to the transformers voltage, current, and power?

Since the Np value is greater than the Ns Value provided then it is a step down in voltage as indicated by the rules provided above. under primary and secondary coilings. In regards to current, when there is low voltage there is a large current because they are indirectly proportional, so the current steps up. Power always remains constant

Note:

⬜ High Voltage = Small Current

⬜ Low Voltage =  Large Current

⬜ Power is unaffected

Chapter 23

Resonance - feeding energy into a system and getting maximum response

  • Max Power
  • Impedance minimum
  • K1=Xc
  • Ø = 0
  • Power factor = 1

Formulas:

Test Example Questions:

What happens to resonance frequency if resistance increases? Frequency does not change

*Fc can be changed if L or C change. they have an inversed relationship.

Note:

Fc⬜        C = open circuit

L = short circuit

Fc⬜        ∞  C = short circuit

L=open circuit

Chapter 24

“EM Radiation”

The electromagnetic spectrum is a series of electromagnetic wave frequencies or wavelengths in the order radio, micro. IR, VIS, UV, X-ray, gamma ray

*Wavelength is in distance

Example Test Questions:

Which has the highest speed amongst Micro, Vis, X-ray, or all are the same? Which wavelength is longer? Which has the lowest frequency?

All have the same speed, Micro has the longest wavelength and the lowest frequency

Note:

Lower frequency = High wavelength

Transverse:

  • Wave is moving up and down parallel to directio
  • Can be polarized

*Be familiar with Roemer and Michaelson

Michaelson used a rotating eight sided mirror to measure the speed of light.

Energy Density

Unit: Jm3

Total energy density: 

Electric:

(The electric portion of the equation is the same amount as the magnetic)

Magnetic:

The relationship between electric and magnetic field: E=cB

Intensity: Power / Area

S = Cu (Symbol = S)

Units: w/m^2

Sample Test Question: 

When magnetic wave is doubled, field is _________. (doubled)

When magnetic wave is halved, field is _________. (doubled)

Doppler Effect:

Approaching source ⬜ high frequency ⬜ Blue Shift

Receding source ⬜ low frequency ⬜ Red Shift

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