Electricity

• Electricity is the term given to a wide range of phenomena
• 2 branches of Physics Dealing with electricity

  Electrostatic and Electrodynamics
• Has a positively Charge

  Proton
• Has negatively charge

  Electron
• Has a zero charge

  Neutron
• Electric Charge


  Fundamental property of matter that causes to experience electromagnetic interaction
• Unit of electric charge, Coulomb (C)
• Who studied electrical charge?

  Charles Agustin De Coulomb
• 2 Kinds of Charge

  Positive and Negative
• Law of charges

  Likes repel, unlike attracts
• Law of Conservation


  States that the total amount of electric charge in a closed system remains constant
• Methods of charging. 1. Charging by frictrion 2. Charging by Contact 3. Charging by Induction
• Electrification


  A process of making a neutral body into charged body
• Charging by friction


  when object rub against each other
• Charging by Contact


  Transferring electrical charge through Physical contact
• Charging by Induction


  Without direct contact
• Static Electricity


  the build-up of electric charge on the surface of an object
• Grounding 


  method of neutralizing or dissipating the charge
• Conductors


  A type of electrical material that allow electric charge to flow freely
• Insulator


  A type of electrical materials that resist the flow of electric current
• Semiconductors


  A type of electrical materials that neither a good conductors and not good insulators
• Super conductors


  A type of electrical conductors that are perfect conductors of electricy
• Electroscope


  An electrical instrument that is use to detect electrical charge
• Electrophorus


  An electrical Instrument use as a charge generator
• Coulombs Law


  This law states that the magnitude of the force of attraction or repulsion between two points is directly proportional to the product of the magnitude of their charges and inversely proportional to the square of the distance between them.
• Formula for Coulombs Law

  Fe= Kq1q2/r^2
• SI Unit of Coulombs

  Newton (N)
• SI Unit of Magnitude

  Coulomb (c)
• SI Unit of Radius

  Meter (m)
• K is the proportionality constant

  Value 9x10^9 N.m^2/C^2
• 1 coulombs to electron

  6.25x10^18
• 1 coulobs to statcoulombs

  3x10^9 StatC
• 1coulomb to microcoulombs

  9x10^6
• 1 coulombs to nanocoulombs

  9x10^9
• 1 coulombs to picocoulombs

  9x10^12
• Electric Field


  it is the electric force per unit charged
• Superposition Principle


  Every charge in space creates an electric field
• The resultant electric field is the vector sum of the electric field due to individual charges
• Formula for Electric field

  E=kq/r^2
• SI unit of Electric Field

  Newton/Coulomb