Electricity

• 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
• 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

  • Coulomb
  • Electron
  • Proton
  • Neutron

  Electron
• The coulomb is a unit of

  • Electric charge
  • Potential difference
  • Current
  • Voltage

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

  • Copper
  • Silver
  • Glass
  • Gold

  Glass
• The electron valence of a copper atom is

  • +1
  • 0
  • ±4
  • -1

  +1
• The unit of potential difference is the

  • Volt
  • Ampere
  • Siemens
  • Coulomb

  Volt
• Which of the following statements is true?

  • Unlike charges repel each other
  • Like charges repel each other
  • Unlike charges attract each other
  • Both b and c

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

  • Positive ions are the moving charges that provide current
  • Free electrons are the moving charges that provide current
  • There are no free electrons
  • None of the these

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

  • 0.01 S
  • 0.1 S
  • 0.001 S
  • 1 S

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

  Coulomb

  Electron

  Proton

  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
• The unit of electric current is the

  • Volt
  • Ampere
  • Coulomb
  • Siemens

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

  • ±4
  • +1
  • -7
  • 0

  ±4
• Which of the following statements is true?

  • Current can exist without voltage
  • Voltage can exist without current
  • Current can flow through an open circuit
  • Both b and c

  Voltage can exist without current
• The unit of resistance is the

  • Volt
  • Coulomb
  • Siemens
  • Ohms

  Ohms