Energy

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Energy
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What is Energy?

• Energy is the ability to do work.

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So, What is work?

• Work is the amount of force applied multiplied by
  distance.
• W F x d
• We also know that F ma
• Therefore Work mad
• This is why it is so hard to get up on Mondays ?
• Work is mad. Little science humor there and yes
  it is funny!!!

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To do work

• In order to do work, we must have energy.
• Energy comes from many different sources, but
  ultimately, all of our energy on Earth comes from
  the sun.

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Types of Energy

• Kinetic Energy
• Kinetic energy is the energy of movement.
• Running
• Jumping
• Rolling
• Hitting
• Wind
• Sound

• Potential Energy
• Potential Energy is stored energy.
• The energy in
• A Battery
• Food
• Atoms
• Objects at rest
• Fossil Fuels

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Other Classifications of Energy

• Renewable
• Hydroelectric
• From rivers, streams and dams
• Wind
• Collected by wind turbines
• Geothermal
• From magma heat close to the crust of the Earth
• Solar
• Captured from the sun.

• Non-renewable
• Fossil Fuels
• Petroleum
• Coal
• Natural Gas
• Timber
• Even though trees can be re-grown, they cannot be
  replaced as quickly as they have been cleared
  from the lands.

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Conversion of Energy

• Energy can be changed from one type of energy to
  another type of energy.
• This is how we can get stored energy from our
  food and change it into energy of motion when we
  walk, talk and grow.
• The Law of Conservation of Energy
• Energy cannot be created nor destroyed. It can,
  however, be changed from one form to another.

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Electricity from Fossil Fuels

• Like most power plants, plants that burn fossil
  fuels turn water into steam which then spins a
  turbine. The spinning turbine then turns a
  generator.

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Hydroelectricity

• Hydroelectric energy comes from the movement of
  water through a turbine.

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Nuclear Power

• Like the other power plants, nuclear plants
  change water into steam to turn a turbine. The
  heat is generated by the break down of
  Uranium-235 atoms.

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Geothermal Power

• Geothermal plants pump water deep into the
  Earths crust. The water comes close enough to
  the mantle that it is turned into steam.
• This is mainly done in places where the Earths
  crust is very thin.
• Ex. Iceland and New Zealand

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Solar Power Plants

• Solar power plants use rows of large mirrors to
  focus light on a tank of water. The water then
  turns to steam which spins a turbine.

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Time to Sum it Up

• On a clean sheet of paper
• Write a three paragraph essay comparing each of
  the five power plants discussed.
• Describe the similarities and differences of the
  sources of energy and the method of creating
  electricity.