Elecs 1: Basic Electricity and Magnetism

• An invisible force that can produce heat, light, and motion.

  Electricity
• The force for _________ is an attraction or repulsion between electric

  charges.

  Motion
• The basic form for a quantity of electricity

  Electric Charge
• The closed path for the movement of charges.


  Circuit
• Two basic particles of electric charge

  Electron and Proton
• _______ is the smallest amount of electric charge having the characteristic called negative polarity

  Electron
• The proton is a basic particle with ________.

  Positive Polarity
• Is it true or false that the neutral condition means equal positive and

  negative charges?

  True
• The smallest particle of the basic elements that form solid, liquids, gases we know as physical substances.

  Atom
• Central mass of an atom

  Nucleus
• Proton is _______ times heavier than an electron

  1840
• Electrons that can move freely from one atom to the next.

  Free electrons
• Electrons that can move easily from atom to atom in a material.

  Conductor
• The best conductor.

  Silver
• A material with atoms in which the electrons tend to stay in their own

  orbits.

  Insulator
• An insulating material and also can store electric charges


  Dielectric
• An insulating material and also can store electric charges.


  Dielectric
• A material that conducts less than the metal conductors but more than the insulators.

  Semiconductors
• Practically all transistors are made of _________.

  Silicon
• Defined as a substance that cannot be decomposed any further by chemical action.

  Elements
• Greek word that means a particle too small to be subdivided.

  Atom
• Semiconductors have _____ electrons in the outermost ring.

  4
• ____ Electrons in the outside ring is a stable structure.

  8
• A group of two or more atoms.

  Molecule
• A group of two or more elements.

  Compound
• The smallest unit of a compound with the same chemical characteristics.

  Molecule
• Atomic number of oxygen.

  8
• The most basic particle of negative charge is the

  a. Coulomb

  b. Electron

  c. Proton

  d. Neutron

  Electron
• The coulomb is a unit of

  a. Electric charge

  b. Potential difference

  c. Current

  d. Voltage

  Electric charge
• Which of the following is not a good conductor?

  a. Copper

  b. Silver

  c. Glass

  d. Gold

  
  

  Glass
• The electron valence of a copper atom is

  a.+1

  b. 0

  c. ±4

  d. -1

  +1
• The unit of potential difference is the

  a.Volt

  b. Ampere

  c. Siemens

  d. Coulomb

  Volt
• Which of the following statements is true?

  a.Unlike charges repel each other

  b. Like charges repel each other

  c. Unlike charges attract each other

  d. Both b and c

  Both b and c
• In a metal conductor, such as a copper wire,

  a.Positive ions are the moving charges that provide current

  b. Free electrons are the moving charges that provide current

  c. There are no free electrons

  d. None of the these

  Free electrons are the moving charges that provide current
• A 100 Ω resistor has a conductance, G, of

  a.0.01 S

  b. 0.1 S

  c. 0.001 S

  d. 1 S

  0.01 S
• 9. The most basic particle of positive charge is the

  a. Coulomb

  b. Electron

  c. Proton

  d. Neutron

  Proton
• If a neutral atom loses one of its valence electrons, it becomes

  • Negative ion
  • Electrically charged atom
  • Positive ion
  • Electrically charged atom and positive ion

  Electrically charged atom and positive ion
• 11. The unit of electric current is the

  a.Volt

  b. Ampere

  c. Coulomb

  d. Siemens

  Ampere
• A semiconductor, such as silicon, has an electron valence of

  • ±4
  • +1
  • -7
  • 0

  ±4
• Which of the following statements is true?

  a.Current can exist without voltage

  b. Voltage can exist without current

  c. Current can flow through an open circuit

  d. Both b and c

  Voltage can exist without current