Physics Exam Three Study GuideDon't forget about the age old question of What are the gender differences in motor skills?
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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.
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
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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
⬜ High Voltage = Small Current
⬜ Low Voltage = Large Current
⬜ Power is unaffected
Resonance - feeding energy into a system and getting maximum response
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.
Fc⬜ C = open circuit
L = short circuit
Fc⬜ ∞ C = short circuit
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
Lower frequency = High wavelength
*Be familiar with Roemer and Michaelson
Michaelson used a rotating eight sided mirror to measure the speed of light.
Total energy density:
(The electric portion of the equation is the same amount as the magnetic)
The relationship between electric and magnetic field: E=cB
Intensity: Power / Area
S = Cu (Symbol = S)
Sample Test Question:
When magnetic wave is doubled, field is _________. (doubled)
When magnetic wave is halved, field is _________. (doubled)
Approaching source ⬜ high frequency ⬜ Blue Shift
Receding source ⬜ low frequency ⬜ Red Shift