Electricity 1A

13. What is the power consumed in watts by a 12 AWG conductor that is 100 ft long and has a resistance (R) of 0.20 ohms, when the current (I) in the circuit is 16A? Formula: Power = I2 x R.

[50W]

35. The NEC applies to the installation of _______

[All of these]

8. Electrical pressure is called _______, and it is measure in volts

[EMF or Potential] [a or b]

4. Because of their light weight, _____ actively participate in the transfer of energy

[Electrons]

9. In electrical systems, the volume of electrons that move through a conductor is called the "circuit _____."

[Intensity]

7. The electric motor works on the principle of the attracting and repelling forces of ____ fields.

[Magnetic]

52. The continuity of a grounded conductor shall not depend on a connection to _____.

[cable armor]

42. The NEC defines a "_____" as all circuit conductors between the service equipment, the source of a separately derived system, or other power supply source, and the final branch circuit overcurrent device.

[feeder]

12. The feeder demand load for an 8kW load, increased by 20% is____

B. 9.60 kW

2. To check that a DMM is operating correctly before taking a voltage measurement on an unknown voltage source,

Check the DMM measurement on a known (energized) voltage source

3. The ___ button is used to capture the lowest and highest measurement

Min max

1. Which of the following factors determine the severity of an electrical shock?

Path through the body

What does it cost per year (at 8 cents per kWh) for the power loss of a 12 AWG conductor (100 ft long) that has a total resistance of 0.40 ohms and current flow of 16A? Formula: Cost per Year = Power for the Year in kWh x $0.08.

[$72]

43. A device intended for the protection of personnel that functions to de energize a circuit or portion thereof within an established period of time when the current to ground exceeds the values established for a Class A device, is a(n) "_____."

[ground fault circuit interrupter]

46. Nonautomatic is defined as requiring _____ to perform a function.

[human intervention]

60. The conductors used to connect the surge protective device to the line or bus and to ground shall not be any longer than _____ shall avoid unnecessary bends.

[necessary]

32. The total circuit resistance of two 12 AWG conductors (each 100 ft long) is 0.40 ohms. If the current of the circuit is 16A, what is the power loss of both conductors? Formula: P = I2 x R.

[100W]

15. What is the maximum distance that two 14 AWG conductors can be run if they carry 16A and the maximum allowable voltage drop is 10V? D = (Cmil x VD)/(2 x K x I) D = (4,110 cmil x 10V)/(2 x 12.90 ohms x 16A)

[100ft]

30. Conductance or conductivity is the property of metal that permits current to flow. The best conductors in order of their conductivity are: _____.

[silver, copper, gold, aluminum]

49. Only wiring methods recognized as _____ are included in this Code.

[suitable]

48. An enclosure constructed so that moisture will not enter the enclosure under specific test conditions is called "_____."

[watertight]

47. A single receptacle is a single contact device with no other contact device on the same _____.

[yoke]

17. The output power of a transformer is 100W and the transformer efficiency is 90 percent. What is the transformer input if the output is lower than the input? Formula: Input = Output/Efficiency

[110W]

55. Underground service conductors that supply power to limited loads of a single branch circuit shall not be smaller than _____.

[12 AWG copper]

What is the power loss in watts of a conductor that carries 24A and has a voltage drop of 7.20V? Formula: P = I x E.

[175W]

53. Receptacle outlets in or on floors shall not be counted as part of the required number of receptacle outlets for dwelling unit wall spaces, unless they are located within _____ in. of the wall.

[18]

What is the power consumed by a 10 kW heat strip that's rated 230V, if it's connected to a 115V circuit? Formula: P = E2/R. [

[2.50 kW]

10. An overcurrent protection device (breaker or fuse) must be sized no less than 125 percent of the continuous load. If the load is 16A, the overcurrent protection device will have to be sized at no less than _____.

[20A]

56. A bare 4 AWG copper conductor installed horizontally near the bottom or vertically, and within that portion of a concrete foundation or footing that is in direct contact with the earth, can be used as a grounding electrode when the conductor is at least _____ ft in length.

[20]

14. What is the area in sq in. of a trade size 2 raceway? Formula: Area = Pi x r2, Pi = 3.14, r = radius (1/2 of the diameter).

[3 sq in]

58. Where rock bottom is encountered when driving a ground rod at an angle up to 45º, the electrode can be buried in a trench that is at least _____ deep.

[30 in]

54. For installations consisting of not more than two 2 wire branch circuits, the building disconnecting means shall have a rating of not less than _____.

[30A]

51. The working space in front of the electric equipment shall not be less than _____ in. wide, or the width of the equipment, whichever is greater.

[30]

23. What is the conductor power loss for a 120V circuit that has a 3 percent voltage drop and carries a current flow of 12A? Formula: P = I x E.

[43W]

57. Grounding electrodes of the rod type less than _____ in. in diameter shall be listed.

[5/8]

16. What is the current in amperes of an 18kW, 208V, three-phase load? Formula: I = P/(E x √3) I = 18,000W/(208V x 1.732)

[50A]

29. What is the current in amperes of an 18kW, 208V, three-phase load? Current: I = VA/(E x √3) Current: I = 18,000W/(208V x 1.732)

[50A]

What is the voltage drop of two 12 AWG conductors (0.40 ohms) supplying a 16A load, located 100 ft from the power supply? Formula: EVD = I x R

[6.40 volts]

20. What is the voltage drop of two 12 AWG conductors (0.41 ohms) supplying a 16A load, located 100 ft from the power supply? Formula: EVD = I x R.

[6.40V]

50. Conductor ampacity shall be determined using the _____ column of Table 310.15(B)(16) for circuits rated 100A or less or marked for 14 AWG through 1 AWG conductors.

[60]

22. What is the approximate power consumed by a 10 kW heat strip rated 230V, when connected to a 208V circuit? Formula: P = E2/R.

[8 kW]

11. The maximum continuous load on an overcurrent protection device is limited to 80 percent of the device rating. If the overcurrent device is rated 100A, the maximum continuous load is _____.

[80A]

19. Ohm's Law demonstrates the relationship between circuit ___.

[All of these]

28. The volume of an enclosure is expressed in _____, and it is calculated by multiplying the length, by the width, by the depth of the enclosure. [

[Cubic Inches]

Fires can be caused by electrical energy when _____ from an arcing electric fault ignites adjacent combustible materials. [

[Current]

41. A building that contains three or more dwelling units is called a "_____."

[Multifamily Dwelling]

5. Voltmeters are connected in _____ with the circuit and measure the difference of potential between the two test leads

[Parallel]

27. "_____" is defined as the rate of work measured by the unit called the watt.

[Power]

26. Ohmmeters measure the _____ or opposition to current flow of a circuit or component.

[Resistance]

6. Ohmmeters measure the _____ or opposition to current flow of a circuit or component.

[Resistance]

36. In the NEC, the word(s) "_____" indicate a mandatory requirement.

[a or b]

37. The circuit conductors between the final overcurrent device protecting the circuit and the outlet(s) are known as "_____ conductors."

[branch circuit]

38. An enclosure design for either surface mountain of flush mountain provided with a frame in which door(s) can be hung is called a(n): ________

[cabinet]

44. A device that provides a means to connect intersystem bonding conductors for _____ systems to the grounding electrode system is an "intersystem bonding termination."

[communications]

39. A conductor encased within material of composition or thickness that is not recognized by the NEC as electrical insulation is considered _____.

[covered]

45. A _____ location is protected from weather and not subject to saturation with water or other liquids.

[damp]

18. The Ohm's Law formula, I = E/R, states that current is _____ proportional to the voltage, and _____ proportional to the resistance.

[directly, inversely]

34. The NEC is _____:

[for the practical safeguarding of persons and property]

40. The selection and installation of overcurrent protective devices so that an overcurrent condition will be localized to restrict outages to the circuit or equipment affected, is called "_____."

[selective coordination]

59. Lightning protection systems ground terminals ____ be bonded to the building or structure grounding electrode system.

[shall]