Transcript Electrical Energy

TOPIC: Energy
AIM: Describe the five forms of energy.
Do Now: Ditto – Mixtures #’s 1 – 5
Take out your periodic table activity
HW: Periodic Table Activity due tomorrow
CL Phases and Phase changes due Monday
1. Group (Family) 8, Period 5
= Ru
2. Group (Family) 14, Period 4
= Ge
3. Group (Family) 18, Period 6
= Rn
4. Group (Family) 2, Period 4
= Ca
Mechanical • Energy in moves an
Energy
object
Examples:
• Energy used to put a book on a shelf
• Energy used to turn a car key
Chemical • Energy stored in the
chemical composition
Energy
of matter
H
H
O
Bond
• Bonds broken chemical
energy released
Examples:
• Released when wood or gasoline burns
• Stored in food
• Batteries, unlit match
•
Energy
in
moving
Thermal
particles of matter
Energy
• Heat Energy
• Atoms move faster  more
thermal energy produced
Examples:
• Can cause phase changes
SOLID
GAS
• Can result from friction
Almost everything changes to
heat energy.
Electromagnetic
Energy
• Transmitted through
space in the form of
electromagnetic
waves
Ex: visible light, X-rays, microwaves
• Produced when we cause
Electrical electrons to move from one
Energy
place to another
Examples:
• Electricity moving through a wire
• Lightening bolts
• Electrical coils on a stove
•
Energy
stored
in
Nuclear
nucleus of an atom
Energy
• When nuclei fuse together or
break apart
http://www.youtube.com/watch?v=91XW8AkjG2Y
Advantages • Power plants could
of nuclear still produce
energy
electricity after coal
and oil become
scarce
• Power plants need less fuel
than ones which burn fossil
fuels.
(One ton of uranium produces more
energy than is produced by several
million tons of coal or several million
barrels of oil)
• Do not produce air pollutants & CO2
• Nuclear explosions
Disadvantages produce radiation.
of nuclear
– harms body cells 
illness or death
energy
– Reactor disaster =
meltdown.
• Fission reaction goes
out of control 
nuclear explosion
•
http://www.youtube.com/watch?v=TLBRT_OY2No
Chernobyl, Ukraine, 1986 = reactor core
overheated during safety test. Materials in the
core caught fire and caused a chemical explosion
that blew a hole into the reactor. Radiation was
carried by the wind. Twenty-eight people died of
radiation sickness.
Fukushima nuclear accident
resulted in a meltdown of 3 of
the plant's 6 nuclear reactors.
The failure occurred when the
plant was hit by the tsunami
triggered by the Tōhoku
earthquake.
Although no short term
radiation exposure fatalities
were reported, some 300,000
people evacuated the area,
15,884 (as of 10 February
2014) people died due to the
earthquake and tsunami, and
as of August 2013
approximately 1,600 deaths
were related to the
evacuation conditions, such
as living in temporary housing
and hospital closures.
The World Health
Organization indicated that
evacuees were exposed to
so little radiation that
radiation-induced health
impacts are likely to be
below detectable levels,[17]
and that any additional
cancer risk from radiation
was small—extremely
small, for the most part—
and chiefly limited to those
living closest to the nuclear
power plant.
• Water used to cool power plants
– excess heat may kill organisms in
streams & rivers it’s released into
• Wastes release radiation
– Cannot be thrown away like garbage
– Stored in special cooling pools at the
nuclear reactors
Mechanical
Mechanical
Flashlight = converts chemical
energy (stored in the battery)
to electrical energy to light
the bulb. The bulb converts
the electrical energy to
electromagnetic energy.
Toaster = converts
electrical energy into
thermal energy.
Car engine = converts the chemical
energy stored in the gasoline into
mechanical and thermal energy.
Radio = converts electrical energy
into sound energy.
Human body = converts
chemical energy stored in
food into mechanical
energy for a beating heart
and moving muscles.
Let’s summarize…
1. Identify the 5 forms of energy.
2. Identify another name for heat energy.
3. Describe what occurs to particles as temperature
increases.
4. Where is chemical energy found? How is it
released?
5. How is electromagnetic energy transmitted? Give
one example.
6. Where is nuclear energy stored?
7. How is electrical energy produced?
Energy appears in many forms. Which
form of energy is lightening?
1. Magnetic
2. Mechanical
3. sound
4. Electrical
A family is moving from Pennsylvania to
Connecticut. As the moving van burns gasoline, it
converts
1. chemical energy into mechanical energy
2. kinetic energy into potential energy
3. thermal energy into electrical energy
4. mechanical energy into kinetic energy
When an electric current flows through a metal
filament of a light bulb, the electrical energy is
converted into
1. heat energy, only
2. heat and light energy
3. light and motion energy
4. light energy only
Which energy source was developed
through the invention of the atomic
bomb?
1. Nuclear
2. Geothermal
3. Solar
4. Hydropower
An unlit match contains
1.Thermal energy
2.Electrical energy
3.Chemical energy
4.Nuclear energy
Which device produces mechanical
energy?
1. A battery
2. A light bulb
3. An electric motor
4. A solar cooker
A song is playing on the radio. Which
best describes the change in the flow of
energy?
1. Electrical energy  light energy
2. Electrical energy  sound energy
3. Sound energy  light energy
4. Sound energy electrical energy
A bicycle rider ate breakfast before the
ride. Which energy transformation
occurred during the bike ride?
1. Mechanical to chemical energy
2. Chemical to mechanical energy
3. Mechanical to nuclear energy
4. Nuclear to mechanical energy
Windmills are used to convert wind energy to a more
useful form. In most cases, there are steps in this
process. The energy is in a different form in each
step. Which of the following flowcharts shows the
most likely order of the energy changes?
1. Wind energy  mechanical energy  solar
energy
2. Wind energy  thermal energy  mechanical
energy
3. Wind energy  solar energy  electrical energy
4. Wind energy  mechanical energy  electrical
energy