Module 1

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bugsbunny2255
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191294
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Module 1
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2013-02-03 17:15:56
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AT2 adv
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  1. Matter can be found in which of the following forms?
    Solid, Liquid and Gaseous.
  2. A substance that CANNOT be reduced to a simpler substance by chemical means is called a/an?
    Element
  3. A molecule is the smallest possible particle that retains the characteristic of which of the following substances?
    A compound.
  4. An atom is the smallest possible particle that retains the characteristic of which of the following substances?
    An element.
  5. If light energy collides with an orbiting electron, what happens to the electron?
    The electron will jump to an orbit further from the nucleus.
  6. After light energy collides with an orbiting electron, the electron will return to the condition it had before being acted upon by the light. When the electron returns to this condition, what action occurs?
    Light energy is emitted.
  7. What is the main difference between conductors, semiconductors, and insulators?
    The number of free electrons.
  8. Which of following actions describes the easiest way to accumulate a static electric charge?
    Friction between two insulators.
  9. What is/are the term(s) applied to the space between and around charged bodies in which their influence is felt?
    Electric field of force, electrostatic field, and dielectric field.
  10. Electrostatic lines of force are drawn in which of the following manners?
    Leaving negative charge, entering positive charge.
  11. Which device use magnetism?
    High-fidality speakers.
  12. Ferromagnetic materials have what quality?
    They are relatively easy to magnetize.
  13. A material with low reluctance and high permeability such as iron or soft steel is used to make what type of magnet?
    Temporary
  14. The ability of a material to retain magnetism is called?
    Retentivity.
  15. According to the domain theory, if an atom with 26 electrons has 20 electrons spinning counterclock-wise, the atom is considered to be
    Magnetized
  16. If a glass plate is placed over a magnet andiron filings are sprinkled over the glass, a pattern will be visible. What does this pattern indicate?
    The magnetic field.
  17. An imaginary line used to illustrate a magnetic effect is known as a/an
    Magnetic line of force.
  18. A magnetic shield or screen used to protect a delicate instrument should be made of which of the following materials?
    Soft Iron
  19. What is the term applied to the ability to do work?
    Energy
  20. What terms apply to the difference of potential between two bodies?
    Voltage and electromotive force.
  21. What is the general term that describes a device which supplies a voltage?
    A voltage source.
  22. In addition to friction, magnetism, and chemical action, what methods can be used to produce a voltage?
    Pressure, heat, and light.
  23. When directed drift takes place, at what speed does the effect take place?
    186,000 miles per second
  24. If the voltage in a circuit increases, what happens to the current?
    Current increases.
  25. What value is equal to100 mA?
    0.10 Ampere
  26. If low weight is the major factor, what material should be used as a conductor?
    Aluminum
  27. Resistance of a conductor will increase with what changes to the cross-sectional area and length of the conductor?
    Cross-sectional area is decreased,length is increased
  28. A material whose resistance remains constant as the temperature increases has what temperature coefficient?
    Neutral
  29. Resistance bears which, if any, of the following relationships to conductance?
    A reciprocal relationship
  30. How is the ability of a resistor to dissipate heat indicated?
    By the wattage rating.
  31. What is the total number of connections on(a) a rheostat and (b) a potentiometer?
    Two and Three
  32. What, if any,  types of variable resistors is used to control a large amount of current?
    Rheostat
  33. According to Ohm,s law, what formula should be used to calculate circuit voltage if resistance and current value are known?
    E=IR
  34. What term applies to the rate at which an electrical force causes motion?
    Power
  35. What circuit quantities can be varied ONLY by varying one of the other circuit quantities?
    Voltage, current, and resistance.
  36. What type of resistor should be used for 60W?
    Carbon
  37. When Kirchoff,s voltage law is used to assign polarities to the voltage drop across a resistor, which of the following references is used to indicate the end of the resistor that the current enters?
    Positive
  38. What terms applies to a circuit in which there is NO complete path for current?
    Open
  39. A circuit in which the resistance is almost zero ohms is referred to by which of the following terms?
    Short
  40. Maximum power is transferred from a source to a load when the value of the load resistance is of what value when compared to the source resistance?
    Equal
  41. When maximum power is transferred from a source to a load, what is the efficiency of power transfer?
    50%
  42. A circuit consists of three resistors connected in parallel. R1 = 30 ohms,R2 = 15 ohms, and R3 = 10 ohms. If the current through R2 = 4 amperes, what is the total source voltage?
    220V
  43. What is the relationship of total current to the current through a component in (a) a series circuit, and (b) a parallel circuit?
    Equals and Divides.
  44. If a current has a negative polarity when Kirchoff's current law is applied, which of the following, statements is true of the current?
    It is leaving a junction.
  45. Which of the following terms describes a single resistor that represents a complex circuit?
    Equivalent resistor
  46. If circuit voltage is held constant, circuit current will react in what manner as the resistance (a) increases, and (b) decreases?
    Decrease and Increase
  47. If circuit resistance is held constant,circuit current will react in what manner as the voltage (a) increases, and(b) decreases?
    Increase and decrease
  48. According to Ohm,s law, what formula should be used to calculate circuit voltage if resistance and current value are known?
    E = IR
  49. Which of the following terms applies to the rate at which an electrical force causes motion?
    Power
  50. Which of the following circuit quantities can be varied ONLY by varying one of the other circuit quantities?
    Voltage, current, resistance.
  51. Which of the following is a correct formula for determining power in an electrical circuit?
    P = EI
  52. How much total energy is converted by a l-horsepower motor in 10 hours?
    7.46 kWh
  53. When Kirchoff,s voltage law is used to assign polarities to the voltage drop across a resistor, which of the following references is used to indicate the end of the resistor that the current enters?
    Positive
  54. Which of the following terms applies to a circuit in which there is NO complete path for current?
    Open
  55. A circuit in which the resistance is almost zero ohms is referred to by which of the following terms?
    Short
  56. To achieve maximum power transfer in the circuit, which of the following conditions must be met?
    Ri = RL
  57. Maximum power is transferred from a source to a load when the value of the load resistance is of what value when compared to the source resistance?
    Equal
  58. When maximum power is transferred from a source to a load, what is the efficiency of power transfer?
    50%
  59. A circuit consists of three resistors connected in parallel. R1 = 30 ohms,R2 = 15 ohms, and R3 = 10 ohms. If the current through R2 = 4 amperes, what is the total source voltage?
    220 V
  60. What is the relationship of total current tothe current through a component in (a) a series circuit, and (b) a parallel circuit?
    Equals and divides.
  61. If a current has a negative polarity when Kirchoff,s current law is applied, which of the following, statements is true of the current?
    It is leaving a junction

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