Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.
Everyday Electricity February 26th, 2009
Conductors in Electrostatic Equilibrium <ul><li>Electrostatic equilibrium </li></ul><ul><ul><li>When no net motion of char...
Why does it matter? <ul><li>When a conductor is in electrostatic equilibrium charge will collect at the sharpest points </...
Van de Graaff Generator <ul><li>The top of the generator </li></ul><ul><li>is a sphere so that large  </li></ul><ul><li>am...
Static Electricity & Lightning <ul><li>Lightning occurs because of a polarization of the storm clouds </li></ul><ul><li>Th...
<ul><li>As the static buildup during the storm becomes stronger the electrical fields around the cloud become strong enoug...
<ul><li>The built-up positive charge can begin to migrate upward forming a streamer. </li></ul><ul><li>When the streamer a...
Lightning Rods <ul><li>Lightning rods are often attached to the tops of tall buildings </li></ul><ul><li>The rod is made o...
 
 
The Leyden Jar <ul><li>Earliest form of a battery </li></ul><ul><li>Charged by static electricity </li></ul><ul><li>Leyden...
Upcoming SlideShare
Loading in …5
×

Everyday Electricity

Related Books

Free with a 30 day trial from Scribd

See all
  • Be the first to comment

  • Be the first to like this

Everyday Electricity

  1. 1. Everyday Electricity February 26th, 2009
  2. 2. Conductors in Electrostatic Equilibrium <ul><li>Electrostatic equilibrium </li></ul><ul><ul><li>When no net motion of charge is occurring within a conductor </li></ul></ul><ul><ul><ul><li>Electrical field is 0 everywhere inside conductor </li></ul></ul></ul><ul><ul><ul><li>Any excess charge resides entirely on the conductors outer surface </li></ul></ul></ul><ul><ul><ul><li>Electrical field just outside a charge conductor is perpendicular to the conductor’s surface </li></ul></ul></ul><ul><ul><ul><li>Charge tends to accumulate where the radius of curvature of the surface is smallest (sharp points) </li></ul></ul></ul>
  3. 3. Why does it matter? <ul><li>When a conductor is in electrostatic equilibrium charge will collect at the sharpest points </li></ul><ul><li>When enough </li></ul><ul><li>charge accumulates </li></ul><ul><li>it will suddenly </li></ul><ul><li>discharge </li></ul>
  4. 4. Van de Graaff Generator <ul><li>The top of the generator </li></ul><ul><li>is a sphere so that large </li></ul><ul><li>amounts of charge can </li></ul><ul><li>build up without discharging </li></ul><ul><li>(they would discharge if </li></ul><ul><li>there was a point on top) </li></ul>
  5. 5. Static Electricity & Lightning <ul><li>Lightning occurs because of a polarization of the storm clouds </li></ul><ul><li>The bottom of the cloud </li></ul><ul><li>develops an excess of </li></ul><ul><li>Negative charge </li></ul><ul><li>A positive charge is </li></ul><ul><li>then induced on the surface </li></ul><ul><li>of the earth </li></ul>
  6. 6. <ul><li>As the static buildup during the storm becomes stronger the electrical fields around the cloud become strong enough to ionize the air, making it able to conduct electricity (becomes a conductive plasma) </li></ul><ul><li>A lightning bolt begins when a step leader of excess electrons begin to move towards the ground. </li></ul><ul><li>These electrons push away even more electrons from the Earth’s surface causing more positive charge to build up </li></ul>
  7. 7. <ul><li>The built-up positive charge can begin to migrate upward forming a streamer. </li></ul><ul><li>When the streamer and step leader meet a complete path is formed and lightning can strike! </li></ul>
  8. 8. Lightning Rods <ul><li>Lightning rods are often attached to the tops of tall buildings </li></ul><ul><li>The rod is made of metal and then attached to a wire that is buried deep in the ground </li></ul><ul><li>This gives the lightning an easy path to the ground and it will avoid going through the building </li></ul>
  9. 11. The Leyden Jar <ul><li>Earliest form of a battery </li></ul><ul><li>Charged by static electricity </li></ul><ul><li>Leyden Jar Demonstration </li></ul>

×