Transcript Electricity & Magnetism Waves Review - Mrs. Carnes

Electricity & Magnetism
Waves
Review
Physical Science
Mrs. Carnes
RMS
Electricity and
Magnetism
Parallel and Series Circuits
Describe the advantages and
disadvantages of series and parallel
circuits
Series Circuits
Advantages
Disadvantages
Parallel Circuits
Advantages
Disadvantages
Distinguish between how series
and parallel circuits transfer energy
Series Circuits
A series circuit has
only one path for
electrons to travel. If
something within the
circuit burns out,
everything in the
circuit
will go out.
Parallel Circuits
A parallel circuit has
more than one path for
the electrons, so
if something burns out,
the other devices in the
circuit continue
to receive electricity.
Explain that electric currents and
magnets can exert force on each
other
Electricity and magnetism are two aspects of
a single electromagnetic force.
Moving electric charges produce magnetic
forces, and moving magnets produce
electric forces.
These effects make electric motors and
generators possible.
Electricity & Magnetism: Current Electricity Video
16:58
Waves
Recognize the characteristics of
electromagnetic and mechanical
(sound) waves
Electromagnetic Characteristics
• No medium requiredcan travel through a
vacuum
• Example: light waves
Mechanical Characteristics
• Requires a medium
• Examples: sound
waves; water waves
Describe how the behavior of light
waves is manipulated in different
processes, such as:
• Reflection: occurs when a wave bounces back after striking a barrier.
Reflected sound waves are called echoes; reflected light waves allow us to
see objects.
• Refraction: is the bending of a wave as it passes at an angle from one
medium to another. One common example of refraction of light waves is the
broken pencil effect that can be observed when a pencil is placed in a glass
of water. The pencil seems to be "broken" at the surface of the water as the
light waves go from the air to the water.
• Diffraction: is the bending of waves around a barrier or through an
opening. The amount of diffraction a wave experiences depends on two
factors: the wavelength of the wave and the size of the barrier or opening the
wave encounters. Sound travels around corners because it has relatively
larger wavelengths than light. We can hear sounds around corners. We can't
see around corners because light has a very small wavelength.
• Absorption: light rays that soak into an object and not bounced back
(reflected)
Explain how the human eye sees objects and
colors in terms of wavelengths
Rods: cells in the eye which allow
us to detect lightness and darkness of
objects.
Cones: cells in the eye which allow us
to recognize colors.
Light bounces off objects and is received into the eye through the
lens. The cone cells recognize colors based upon the frequency of
the light waves. Images are sent to the back of the eye, inverted,
then the to the brain where they are turned right side up and
recognized.
color
wavelength interval
The colors of the visible
light spectrum[1]
Cameras work like
the eye
frequency interval
red
~ 700–635 nm
~ 430–480 THz
orange
~ 635–590 nm
~ 480–510 THz
yellow
~ 590–560 nm
~ 510–540 THz
green
~ 560–490 nm
~ 540–610 THz
blue
~ 490–450 nm
~ 610–670 THz
violet
~ 450–400 nm
~ 670–750 THz
Describe how the behavior of
waves is affected by medium, such
as:
• Air: sound travels faster in warm air than
cool air; the warmer the air, the faster the
sound waves
• Water: water is more dense than air so
sound travels faster in water than air
• Solids: waves move fastest through solids
Sound is faster in solid than air: mine animation
Relate the properties of sound to
everyday experiences
Speed (Doppler Effect)
Frequency (the higher the frequency, the higher the pitch)
Loudness (the greater the amplitude, the more loud the sound)
Sound has a huge impact on our day to day
lives. Just think of how much of our
technology involves sending or receiving
sounds in various forms.
Identify the parts of a wave using a
diagram
Explain how the parts of a wave
are affected by changes in
amplitude and pitch
Frequency affects pitch
Amplitude affects loudness