Energy fields and Electric energy

Energy fields and Electric energy

1. The electric fied

   • Is an electrically charged object sets up a force field around it
     • An object can be charged without ever touching it
       • introduction
     • The electric field can be visualized
       • Electric field add together
         • Applying superposition
     • Electric fields have distinctive shapes and patters
       • Electric dipole
       • Infinite plates and parallel-plate capacitors
     • The electric field is the amount of force per charge
       • Determining the force on a charge
         • Force= amount of charge x electric field
           • F =|q| E
       • Margnitude of electric field = force on positive charge/amount of charge
         • E= F/q0
     • Excess charge moves to a conductor's outer surface
     • Some animals can produce and detect electric fields
     • Rules for drawing electric field lines
       • 1. Electric field lines point in the direction of the electric field vector F--> at every point.
         • 2. Electric fields lines start at the positive charge or at infinity.
           • 3. Electric field lines end at negative charges or at infinity.
             • 4. Electric fields lines are closer tighter where E--> has greater magnitude.
               • 5. The number of electric field lines entering or leaving a charge is proportional to the magnitude of the charge.
     • Magnitude of the electric field due to a point charge
       • Magnitude of the electric field= k (|charge| /(distance)^2)
         • E= k (|q| /r^2)

2. Electric Potencial Energy and Electric potencial

   • Electric fields store mechanical work
     • Opposite charge
     • Like charges
   • Voltage is the electric potencial energy per charge
     • Charge in electric potencial-charge in potencial/charge
       • ∆v=∆PE/q
         • SI unit=joule/ coulomb = volt (v)
   • General equation for energy conservation
     • K|+U| =Kf+Uf= potencional energy: K= kinetic energy
   • Calculating work done in an electric field
     • W=qEd
   • Direction of acceleration in an electric field
     • Negative charges acceleration the direction of increasing electric potencial
     • Positive charges acceleration the direction of decreasing electric potencial
   • Electric potencial related electric field
     • electric field= (change in electric potencial/distance)
       • E = (∆v/m)
         • Si units: volts/meter (V/m)
   • Electric potencial decorases whit distance