Static Electricity

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Static Electricity

• By
• Brianna Shields
• April 27, 2005

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DO NOW

• 1. Which of the 5 main types of energy is
  released when food is digested?
• 2. A child seated at the top of a slide has what
  type of energy (kinetic or potential)?
• 3. Speaking to a crowd requires which of the 5
  main types of energy?

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GOAL

• To explain the occurrence of static electricity

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Review Find the fiction

• Electromagnetic energy is the movement of
  electrical charges
• Chemical energy is the splitting of the atoms
  nucleus
• Heat energy is warmth created when particles rub
  quickly together

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Review Find the fiction

• Electromagnetic energy is the movement of
  electrical charges
• Chemical energy is the splitting of the atoms
  nucleus- FALSE
• Heat energy is warmth created when particles rub
  quickly together

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Review Find the fiction

• Chemical energy is the breaking and releasing of
  bonds between atoms
• Electromagnetic energy is the movement of proton
  particles
• Nuclear energy is created by the splitting of an
  atoms nucleus

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Review Find the fiction

• Chemical energy is the breaking and releasing of
  bonds between atoms
• Electromagnetic energy is the movement of proton
  particles- FALSE
• Nuclear energy is created by the splitting of an
  atoms nucleus

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Review Find the fiction

• Sound is a type of electromagnetic energy
• Light is a type of electromagnetic energy
• X rays are a type of electromagnetic energy

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Review Find the fiction

• Sound is a type of electromagnetic energy- FALSE
• Light is a type of electromagnetic energy
• X rays are a type of electromagnetic energy

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Review Find the fiction

• Digestion is a type of chemical energy
• Rainbows are a type of mechanical energy
• Sound is a type of mechanical energy

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Review Find the fiction

• Digestion is a type of chemical energy
• Rainbows are a type of mechanical energy- FALSE
• Sound is a type of mechanical energy

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Review Find the fiction

• Chemical energy creates warmth when particles rub
  together quickly
• Mechanical energy is used by moving objects
• Electromagnetic energy involves the movement of
  negative electrons

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Review Find the fiction

• Chemical energy creates warmth when particles rub
  together quickly- FALSE
• Mechanical energy is used by moving objects
• Electromagnetic energy involves the movement of
  negative electrons

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Review Find the fiction

• Photosynthesis involves chemical energy
• Digestion involves chemical energy
• Sound involves chemical energy

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Review Find the fiction

• Photosynthesis involves chemical energy
• Digestion involves chemical energy
• Sound involves chemical energy- FALSE

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Review Find the fiction

• Rubbing your hands together involves both
  mechanical and heat energy
• Using a blow dryer involves both electromagnetic
  and heat energy
• Listening to the radio involves both
  electromagnetic and chemical energy

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Review Find the fiction

• Rubbing your hands together involves both
  mechanical and heat energy
• Using a blow dryer involves both electromagnetic
  and heat energy
• Listening to the radio involves both
  electromagnetic and chemical energy- FALSE

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Atom Review

• Proton
• Neutron
• Electron

• Positive (P)
• Found in the nucleus
• Neutral (N)
• Found in the nucleus
• Negative (e-)
• Found zipping around outside the nucleus

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Bohr Model
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How do atoms become charged?

• Draw a sketch of 2 atoms being rubbed together-
  how do they become charged????

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Atom Review

• Charged atoms

• Extra electrons negatively charged object/atom
• Missing electrons positively charged
  object/atom

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Atom Review

• Subatomic Particle Rules

• Opposite charges attract
• Proton-electron
• Like charges repel
• Electron-electron
• Proton-proton

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Atom Review

• Static Electricity

• The accumulation of extra negative electrical
  charges on an object
• Only electrons are transferred (not protons)

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Static Electricity Video Questions

• Explain why your hair becomes attracted to a
  balloon once its been rubbed on your head

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Static Electricity Video
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• For each of the following static electricity
  examples you must do the following
• 1. Draw a picture
• 2. Accompany it with an explanation

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Scenario 1 If you shuffle your feet on the
carpet, then reach out to touch a metal door
knob, you receive a shock by a spark

• Rubbing disturbs the atoms
• Electrons rubbed off carpet and onto your feet
• Shoe has extra es (negative chg)
• Rug is missing es (positive chg)
• Extra electrons from the shoe are transferred to
  the doorknob in the form of an electrical spark

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Scenario 2 Clothing sometimes clings together
upon removal from the dryer- Why?

• Electrons rub off clothes and stick to others
• Some items get a negative charge
• These clothes are attracted to the ones with a
  positive charge (clothes missing electrons).

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Scenario 3 Charging by Induction- charged object
and neutral object attract when atoms in neutral
object rearrange their protons and electrons

• Rub a balloon w/ a cloth to charge it, it
  accumulates extra negatives on it
• Bring it close to a wall and it rearranges the
  atoms on the wall
• It pulls protons closer and pushing electrons away

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Scenario 4 Bending Water

• Charge the rod, bring it close to water
• It rearranges the electrons in the water causing
  the protons to be attracted to the negative rod

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Scenario 5 A shocking experience

• Rub the balloon on a wool shirt
• Bring the balloon near you hair and it attracts
  the hair
• The electrons on the balloon attract the protons
  in the hair through charging by induction

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Scenario 6 Pumping Gas

• Rubbing against car upholstery, talking on the
  cell phone can generate static electricity
• If the electrons are not discharged by touching a
  non-hazardous metal object (like a car door) they
  may be a potential fire risk while pumping gas

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Scenario 7 Bandaids and Certs

• Plastic Cur-aid bandaids will spark when you
  rip the white tabs off quickly as electrons are
  stripped and transferred
• Snapping or quickly biting into wintergreen or
  peppermint certs mints can cause a spark of
  electrons

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Scenario 8 Van de Graff Generator

• This apparatus generates electrons as the belt
  spins
• Electrons are free to pass through the metal
  sphere
• It is grounded with a metal wand protected by a
  plastic handle, hooked into the faucet
• Anyone touching the generator also gathers
  electrons, when you remove your hands you get a
  big shock

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Scenario 9 Lightning

• The accumulation of negative charge in clouds
• Electrons transfer to positively charged ground
  to even out the charge
• Produces electrical spark known as lightning

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Atom Review

• Conductor

• Allows electricity (electrons) to easily pass
  through it
• Ex Metals

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Atom Review

• Insulator

• Provides resistance to electron flow (blocks it
  or slows it down)
• Ex rubber, wood, plastic, glass

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