1. According to Bohr's theory (Neil Bohr), an atom consists of a central nucleus of positive charge around which tiny, negatively charged particles, called                  revolve in fixed orbits
  2. In simple terms, the nucleus is made up of two fundamental particles, known as the             and the             
    proton, neutron
  3. True/False

    The elements are arranged according to their atomic number, which is equal to the number of protons in the nucleus.
  4. An atom (or molecule) that has become electrically
    unbalanced by the loss or gain of one or more electrons
  5. An atom that has lost an electron is called a             ion
    while an atom that has gained an electron is known as a
    positive, negative
  6. The process of producing ions is called                
  7. Electrons that have become dislodged from the outer shell of an atom are known as                 
    free electrons
  8.                  are substances that permit the free motion of electrons
  9. The best conductors from best to worst order:
    • silver
    • copper
    • gold
    • aluminum
  10. Insulators
    • porcelain
    • glass
    • rubber
    • mica
  11. When an                     such as that provided by a battery is connected across a conductor (opposite electrical charges, positive and negative, on each end of the wire), the free electrons are guided in an orderly fashion, atom to atom, from the negative terminal of the battery, through the wire, to the positive terminal of the battery.
    electromotive force (EMF)
  12. Unlike-charges attract and like-charges repel.
    Law of Electrical Charges
  13. Orderly drifting motion of free electrons under the application of an electromotive force (or voltage) constitutes an:
    electric current
  14. The existence of such an electric force, where current cannot flow, is referred to as                  or                   .
    electrostatic force, static electricity
  15. The pressure or force that causes free electrons to move in a conductor is referred to as either:
    • Electromotive Force
    • Difference in Potential
    • Voltage
  16. True/False

    Electrons flow from the negatively charged body to the
    positively charged body
  17. The unit of electrical potential is the               . The symbol for voltage is the letter E (electromotive force) when used in formula
  18. The speed of the current, however, is always the same, that is,                   miles per second
  19. True/False

    Electric current is the impulse of electrical energy that one electron transmits to another as it changes orbit
  20. Current is measured in                   one                   may be defined as the flow of 6.28 x 1018 electrons per second past a fixed point in a conductor, that is, 6.28 followed by 18 zeros
  21. Resistance
    ohms Ω
  22. True/False

    The longer the wire, the more resistance; The thicker the wire, the less resistance

    • .5' - .5Ω
    • 1' - 1Ω
    • 2' - 2Ω
    • .5 inches - 2Ω
    • 1 inch - 1Ω
    • 2 inches - .5Ω
  23. kilo
    • k - 1000
    • M - 1,000,000
    • m - .001
    • μ - .000001
  24.                 in an electric circuit is a device that
    usually serves a useful purpose
  25. The Mathematical relationship between current, voltage, and resistance
    • E=I(R)
    • Ohm's Law
Card Set
Basic 3 9.1