Electricity Inspection Section#1 Service Drop & Service Entrance Quiz#2

You should have finished Study Session 1 before starting this study session. This study session deals with the basics of electricity.

The estimated completion time is one hour.

Objectives
At the end of this study session, you should be able to:

• Describe the various tasks that electricity can perform.
• Explain how electricity moves.
• Define terms such as volts, ohms, amperes and watts, and the relationship among these.
• Explain the difference between 120 and 240 volts.
• Describe what a circuit is.
• Name the functions of fuses and breakers.
• Describe parallel circuits.
• Explain the implications of damaged wire and loose connections.

• Question 1

  Needs Grading

  	Electricity can perform 3 very different tasks. What are they?
  	Selected Answer: 1. Light 2. Mechnical work  3. Heat Correct Answer:   1. Light 2. Heat 3. Mechanical work Response Feedback: [None Given]

• Question 2

  Needs Grading

  	Give 2 formulas that describe the relationships between volts, amps, ohms, and watts.
  	Selected Answer: 1. watts = volts x amps 2. amps = volts / ohms  Correct Answer:   V=IxR and P=VxI Response Feedback: [None Given]

• Question 3

  Needs Grading

  	Give a brief definition of a volt.
  	Selected Answer: Volt is a measure of force in an electrical system.  Correct Answer:   A volt is the measure of the force or potential energy in an electrical system. Response Feedback: [None Given]

• Question 4

  Needs Grading

  	Give a brief definition of a watt.
  	Selected Answer: Watt is the measure of the rate of electrical energy being used.  Correct Answer:   A watt is a measure of the rate of electrical energy being consumed or released (P=VxI). Response Feedback: [None Given]

• Question 5

  Needs Grading

  	Give a brief definition of an amp.
  	Selected Answer: how much electricity is flowing through a circuit.  Correct Answer:   An amp is a measure of how much electrical current is flowing (I= V/R). Response Feedback: [None Given]

• Question 6

  Needs Grading

  	Give a brief definition of an ohm.
  	Selected Answer: ohm is the measue of the resistance of an electrical circuit.  Correct Answer:   An ohm is a measure of resistance to electrical flow in a conductor or insulator (R=V/I). Response Feedback: [None Given]

• Question 7

  Needs Grading

  	If electricity costs 10 cents per kilowatt-hour, how much does it cost to leave a 60-watt light bulb on for a year? (Round to the nearest dollar.)
  	Selected Answer: 1 year is equal to 365 x 24 = 8760 hours  60 watts bulb light for 1 year is 60 watts x 8760 = 525 600 watts-hour, which equals to 525.6 kilowatt-hour 525.6 x 0.1 = 52.56 dollar = 53 dollar.  Correct Answer: A 60-watt bulb operating for an hour would consume 60-watt-hours. We convert this to kilowatt-hours by dividing by 1000. This is 0.06 kilowatt-hours. Over the course of a year, the light bulb would consume 0.06 kilowatt-hours x 24 hrs a day x 365 days a year=525.6 kilowatt hours. Each kilowatt-hour costs $0.10. The cost of leaving this lightbulb on is 525.6 x $0.10 = $52.56 or approximately $53.00. Response Feedback: [None Given]

• Question 8

  Needs Grading

  	Turning on another light bulb in the same circuit should not dim the bulbs that are already on because ____________________.
  	Selected Answer: Household wiring is done in parallel  Correct Answer:   They are wired in parallel. Response Feedback: [None Given]

• Question 9

  0 out of 0 points

  	A loose connection is likely to _____ when carrying normal current loads.
  	Selected Answer:  overheat Correct Answer: Evaluation Method Correct Answer Case Sensitivity Exact Match overheat Response Feedback: Good work

• Question 10

  0 out of 0 points

  	A wire that is nicked is likely to _____ when carrying normal current loads.
  	Selected Answer:  short circuit Correct Answer: Evaluation Method Correct Answer Case Sensitivity Exact Match overheat Response Feedback: That's not correct

• Question 11

  0 out of 0 points

  	Which of the following are good conductors? (Choose 3)
  	Selected Answers:   copper   aluminum   silver Answers:   copper plastic rubber   aluminum wood concrete   silver Response Feedback: Good work

• Question 12

  0 out of 0 points

  	Which of the following are good insulators? (Choose 3)
  	glass   ceramics   air Answers: gold   glass   ceramics steel   air tap water Response Feedback: Good work

• Question 13

  0 out of 0 points

  	The size of the fuse should be:
  	Selected Answer:   smaller than the rating of the wire Answers: larger than the rating of the wire   the same as the rating of the wire smaller than the rating of the wire based on the total load of the circuit the same as the wire rating for 120 volt circuit and twice the rating of the wire for a 240 volt circuit Response Feedback: That's not correct

• Question 14

  0 out of 0 points

  	When the switch is turned off, is the circuit opened or closed?
  	Selected Answer:   Opened Answers:   Opened Closed Response Feedback: Good work

• Question 15

  0 out of 0 points

  	A 120-volt circuit utilizes a black and red wire.
  	Selected Answer:  False Answers: True  False Response Feedback: Good work

• Question 16

  0 out of 0 points

  	Electrical wiring in a house is direct current.
  	Selected Answer:  False Answers: True  False Response Feedback: Good work

• Question 17

  0 out of 0 points

  	Larger appliances typically require 240 volts.
  	Selected Answer:  True Answers:  True False Response Feedback: Good work

• Question 18

  0 out of 0 points

  	The wires should be considered the brains of the circuit.
  	Selected Answer:  False Answers: True  False Response Feedback: Good work