Physics

• Comes from Greek word elektron which means “amber” because it was noticed that when amber was rubbed with cloth it attracts dust and leaves.

  Electrivity
• What does the Greek word "elektron" mean?

  Amber
• What types of attraction happens when an object becomes charged due to rubbing, causing it to posses a net electric charge?

  Static Electricitty
• Who noticed two types of charges and called them positive and negative?

  Benjamin Franklin?
• What are the two types of charges?

  Positive and Negative
• It occurs when there is a build up of electric charge on the surface of a material.

  Static Electricity
• Why is it called static electricity?

  The charges don't move
• Does the electricity we use involve moving or static charges?

  Moving
• What is the diameter of an atom?

  0.0000000001 nanometer or 1.0 x10^-9
• Approximately, how many atoms are there in your classroom?


  1500000000000000000000000000
• What are the particles that made up an atom?

  Electron, proton, and neutron
• What particles sit together in a lump in the middle?

  Protons and neutrons
• What is the middle part of an atom called?

  Nucleus
• What particles orbit around the nucleus?

  Electrons
• What is the charge of an electron?

  Negative
• What is the charge of a proton?

  Positive
• What is the charge of neutron?

  Nothing or neutral
• True or False: Most things have the same number of electrons and protons in them.

  True
• True or False: They don’t have any overall charge.

  True
• How much is the normal net charge of an atom?

  Zero
• Can electrons be removed from atoms even if they are electrically neutral?

  Yes
• What is the unit of charge?

  Coulomb (C)
• What is the charge of a single proton and electron?

  +/- 1.6 x 10^-19 C
• What are the fundamental law of charges?


  (1) Opposites attract; (2) Likes repel; (3) Any charged object attracts a neutral object
• It is this imbalance of positive and negative charges

  Static electricity
• What results from the transfer of electrons from one material to another?


  Charging of a solid
• What results when an object acquires an excess of electrons?

  Negative charge
• What results when an object acquires a deficit of electrons?

  Positive charge
• Electrostatic series (from tight to lose easily)

  Gold, Sulfur, Brass, Copper, Rubber, Wax, Silk, Lead, Fur, Wool, Glass, Acetate                        
• What are the methods of charging?

  Rubbing, Contact/Conduction, Induction, and Grounding
• What method of charging usually lose their charge quickly?

  Rubbing
• What method of charging where the charges may be neutralized by ions in the air?

  Rubbing
• What method of charging pertains to charges that may “leak” off onto polar molecules like water in the air?

  Rubbing
• Why is there more static electricity on dry days?

  The air moisture content is a natural conductor
• What are the other terms of Charging by Rubbing?

  Charging by friction or Triboelectric Charging
• Intermediate between conductor and insulator

  Semiconductor
• Its few electrons are free

  Semiconductor
• Some of its examples are silicon, germanium, and carbon

  Semiconductor
• It is a device that detects charges present

  Electroscope

  
• When a charged object touches a conductor, the charges “flow” to the conductor and give it the same charge as the initiating object

  Charging by Contact Conduction