MRT CH.4

Edit Answers
1234567891011121314151617181920
Across
  1. 1. Often used to express the difference in electrical potential.
  2. 6. Electricity can arc through the air to a person, tool, or other conductor if they get too close when this occurs.
  3. 8. Loose connections and overloaded electrical conductors or motors cause this.
  4. 11. When the energy is at full system voltage at the point of ground contact, but as you move away from the contact point, the voltage drops progressively.
  5. 15. Materials that have a value of resistance between those of insulators and conductors.
  6. 17. Refers to a current flowing only from positive to negative.
  7. 18. Can exist when energized electrical conductors or circuit parts are exposed or are within equipment in a guarded or enclosed condition.
  8. 20. If you stand with one foot near the point of ground contact and your other foot a step away, the difference in voltage will cause electricity to flow through your body.
Down
  1. 2. Electricity will flow through a body if it touches an energized source with the hands, but the feet are at some distance from the source.
  2. 3. The difference in electrical potential between two points in an electrical field.
  3. 4. Anything below 750 V is commonly referred to as this.
  4. 5. A flow of electrical charge.
  5. 7. Materials of low resistance that conduct electricity in large amounts.
  6. 9. Similar to the effect of friction on the flow of water in a pipe.
  7. 10. The process of mechanically connecting isolated wires and equipment to the earth, with sufficient capacity to carry the fault current and to ensure the wires and equipment remain at the same potential as the earth.
  8. 12. Refers to when a current in a circuit reverses polarity or changes direction in current flow 60 times per second.
  9. 13. Always assume that all electrical wires and equipment are _______ until proven otherwise.
  10. 14. This work group uses electrical systems to “Weld, Cut, or Braze”.
  11. 16. Materials of high resistance that conduct electricity in such small quantities that it cannot normally be detected.
  12. 19. A sudden release of electrical energy bridging a gap between two conductors.