Electricity

• The module titled "Electric Fields" covers topics such as electric fields, potential, and capacitance.
• All matter is made of

  Atoms
• All matter are made of atom, contains 


  electrons, protons and neutrons
• When an object has imbalance in the number of electrons and protons it is

  electrically charged
• An object with more electrons than protons is said to carry a

  negative charge
• An object with more protons than electrons is said to carry a

  Positive charged
• Charge cannot be created or destroyed, but it can be transferred between objects
• Charge object exert electric forces on each other
• Opposite charge attract

  Like charge repel
• The symbol of electric charge is usually "q"
• There are common ways for neutral object to become charged

  Friction, Conduction, Induction
• Charging by Friction occurs when two different materials rub against each other
• Charging by Conduction occurs when a neutral object is place in contact with an already charged object
• In solid, proton are usually not mobile; only electron are able to move
• Charging by induction uses a similar mechanism to polarization
• Any materials that  does not allow electric current to pass through it

  Insulator
• Any materials that allows the electric current to pass through it

  Conductor
• A material or a device that allows some current to pass but converts some of the current to another form of energy

  Resistors
• A path for electric current

  Circuit
• An unbroken path for electric current ( no gaps, current can flow).

  Closed circuit
• A path for electric current that has a gap (no current can flow)

  Open Circuit
• A tool to open and close the circuit

  Switch