Energy

• Types of energy


  • Chemical
  • Thermal
  • Sound
  • Radiant
  • Mechanical
  • Electrical
• Law of conservation of energy


  Energy can't be created or destroyed but can be transformed and transferred
• Energy transformation in a blender


  1. Electrical and mechanical

  2. Sound energy
• Energy transformation when playing the flute

  1. Chemical

  2. Sound and mechanical energy
• Energy transformation in a clothes dryer


  1. Electrical

  2. Thermal

  3. Mechanical energy
• Energy transformation in a heat lamp for a pet lizard named Liz


  1. Electrical

  2. Radiant

  3. Thermal energy
• Advantages of nuclear energy

  • Reliable
  • High power output
• Disadvantages of nuclear energy

  • Uranium is not renewable
  • It's expensive
• Advantages of wind energy


  • Quick
  • Clean
• Disadvantages of wind energy

  • Can kill animals in flight
• How most energy sources work

  Because of electron movement
• Static electricity


  Electron movement
• Method of charging: Friction

  1. 2 objects are rubbed together and become charged

  2. One becomes negatively charged and one becomes positively charged

  3. Both are neutral before
• Method of charging: Contact

  1. A charged object is touched to a neutral object

  2. One is neutral and becomes charged

  3. One is charged and the other is neutral before
• Method of charging: Induction

  1. Bring a charged object NEAR a neutral object (temporary)

  2. Bring a charged object NEAR a neutral object that is grounded (permanent)

  3. Neutral object becomes charged temporarily until the charged object is pulled away

  4. Neutral object becomes permanently charged if grounded
• Conductors


  • Charging cable
  • Water
• Insulators


  • Clock
  • Plastic bin
• Ways to discharge an object

  • Lightning and shock
  • Grounding
  • Discharging at a point
  • Humidity
• Cat rubs against glass window

  Cat becomes negatively charged, glass becomes positively charged
• Rabbit snuggles on cotton blanket

  Cotton becomes negatively charged, rabbit becomes positively charged
• Walking through balloons in silk pajamas

  Balloons become negatively charged, silk becomes positively charged
• Putting on polyester shirt

  Head becomes positively charged, polyester becomes negatively charged
• Pith ball is neutral before anything happens
• Plastic strip brought close to (but not touching) pith ball


  Plastic strip remains negatively charged, pith ball becomes temporarily negatively charged
• Plastic strip touches pith ball


  Plastic strip remains negatively charged, pith ball becomes negatively charged
• Insulators and conductors (neutral) become negatively charged when they gain electrons and positively charged when they lose electrons
• Types of energy


  • Chemical
  • Thermal
  • Sound
  • Radiant
  • Mechanical
  • Electrical
• Law of conservation of energy


  Energy can't be created or destroyed but can be transformed and transferred
• Energy transformation in a blender


  1. Electrical and mechanical

  2. Sound energy
• Energy transformation when playing the flute

  1. Chemical

  2. Sound and mechanical energy
• Energy transformation in a clothes dryer


  1. Electrical

  2. Thermal

  3. Mechanical energy
• Energy transformation in a heat lamp for a pet lizard named Liz


  1. Electrical

  2. Radiant

  3. Thermal energy
• Advantages of nuclear energy

  • Reliable
  • High power output
• Disadvantages of nuclear energy

  • Uranium is not renewable
  • It's expensive
• Advantages of wind energy


  • Quick
  • Clean
• Disadvantages of wind energy

  • Can kill animals in flight
• Most energy sources work because of electron movement
• Static electricity


  Electrons moving to charge an object
• Method of charging by friction

  1. 2 objects are rubbed together and become charged

  2. One becomes negative and one become positively charged
• When a charged object touches a neutral object


  The neutral object becomes charged