Unit 5

• List 4 law of electrostatics

  repel and attract

  concentration

  coulomb's law

  distribution
• What is the unit of measurement for potential difference ?

  Volt (V)
• List the units of measurements for amount of current flow ?

  ampere ( A)
• What is the unit of measurement for opposition to current flow ?


  Ohms
• Electrostatic- Study of stationary (fixed) electric charges or charges at rest
• like charges repel ; unlike charges attract 


  repel and attract
• inversely proportional square relationship between 2 electric charges

  coulomb's law
• Charges reside on the surface of solid conductors

  Electrons move away from each other 


  distribution
• Electrons concentrate on the sharpest curve and roughest surface of the object

  concentration
• the study of electric charges in motion ; electricity

  electrodynamics
• process of charging an object by adding or subtracting or subtracting electrons

  electrification
• What are the 3 methods of electrification ?

  Friction

  Contact

  Induction
• process of electrical fields acting on one another without contact

  used in the operation of electrical devices

  
  

  induction
• two objects touch and electrons move from one object to another

  causes an equalization

  contact
• What are the four electric states of matter ?

  conductors

  insulators

  semiconductor

  superconductor
• electrons flow easily 


  conductors
• Name an example of a conductor ?

  gold
• Does not allow electron flow

  insulators
• What is an example of an insulator ?

  Rubber
• A conductor under certain conditions and an insulator in other conditions

  Semiconductors
• What is an example of a semiconductor ?


  Silicon
• No resistance to electron flow below certain temperatures

  Superconductors
• What is an example of a superconductor ?

  Titanium
• What is the difference between electric current and electron flow ?

  Actual electron flow travels from negative to positive charges conventional electric currents travel from positive to negative current
• an object with more electrons

  negative charge
• an object with a weak negative charge or an object with fewer electrons

  positive charge
• What are the 4 basic factors the describe the nature for electron flow ?

  direction of electron

  quantity of electron flow

  force ( strength ) of electron flow

  opposition to current flow
• What are the 2 types of electric circuits ?

  series circuit and parallel circuit
• all circuit elements are connected in a line along the same conductor


  series circuit
• During a series circuit the current is constant ( stays the same ) with each element added to the circuit
• During a series circuit voltage increases with each element added to the circuit
• During a series circuit resistance increases with each element connected to the circuit .
• What are advantages of a series circuit ?

  cheap and easy to fix and replace
• What are the disadvantages for a series circuit ?

  adding components, increases the resistance

  entire electrical supply is interrupted when one element fails
• each circuit element has an individual pathway

  parallel circuit
• During a parallel circuit the current increases with each element added to the circuit
• during a parallel circuit the voltage is constant ( stays the same ) with each element added to the circuit
• during a parallel circuit resistance drops with each elemenent connected to the circuit
• What is an advantage during a parallel circuit ?

  electricity continues when one element fails
• What is a disadvantage during a parallel circuit ?

  adding elements, increases current creating a fire hazard