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Susan Brown

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Viewing 15 posts - 1 through 15 (of 1,968 total)
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  • in reply to: Jon’s Questions from Training #27136
    Susan Brown
    Keymaster

      Hi Jonathan,
      I sent you answers via email.

      More on the thermistor:
      If you have only one load in a circuit, it will always drop the source voltage (120v for a fridge), no matter what.

      When you have two or more loads in series, the voltage drops will add up to 120v, and will be proportional to the resistances.

      Example: If one load is 10 ohms and the other is 20 ohms, you’ll have 40v drop across the first and 80v across the second. But if the 10 ohms load changed to a 20 ohm load, then you would have 60v across each one. (I’m not saying what the typical resistances are with thermistor circuits, but just showing how it works.)

      in reply to: “Video does not Exist” #27133
      Susan Brown
      Keymaster

        Good! Yes, it seemed to be a brief outage. Vimeo is normally very stable.

        in reply to: “Video does not Exist” #27131
        Susan Brown
        Keymaster

          Vimeo (our video host) was having issues as of 11:06 am EDT. They usually resolve things like this quickly.
          I was able to get some videos to load just now. Tip: It’s always good to clear your cache before trying to reload when there’s been a glitch like this.
          Sorry for the disruption!
          Susan

          in reply to: 1.5 the refrigeration cycle #27128
          Susan Brown
          Keymaster

            Don’t worry about that now. You’ll learn a lot more about that in Module 3!

            in reply to: Basic Electricity Unit 1 #27126
            Susan Brown
            Keymaster

              Correct!

              in reply to: Basic Electricity Unit 1 #27121
              Susan Brown
              Keymaster

                Hi Denis,

                Question 4
                The answer choices are:
                gold
                aluminum
                glass

                Which of those do you think would make the least good (in other words, worst) conductor?

                Question 14
                The answer choices are:
                1. It is the voltage difference related to a load that is actively doing work
                2. It is the difference between the voltage used by a load and the source voltage
                3. It is the difference between what the voltage supply is supposed to be and what is actually measured

                Which is the definition of voltage drop?

                in reply to: Videos in mod 4 units 3 and 4 #27120
                Susan Brown
                Keymaster

                  Glad to hear it!

                  in reply to: Videos in mod 4 units 3 and 4 #27117
                  Susan Brown
                  Keymaster

                    Were you able to get the videos to play?

                    in reply to: Midterm Q8 #27116
                    Susan Brown
                    Keymaster

                      Hi Walt – did you received the email I sent you with feedback?

                      in reply to: Videos in mod 4 units 3 and 4 #27113
                      Susan Brown
                      Keymaster

                        Hi Robert,

                        I just checked and the videos played for me, so this must be on your end. The thing that usually clears up an issue like this is to log out and refresh your system – clear your cache, start with a fresh browser window.

                        If that doesn’t fix it, let me know!
                        ~ Susan

                        Susan Brown
                        Keymaster

                          Dee – did that fix the issue with the videos playing for you?

                          in reply to: Jon’s Questions from Training #27111
                          Susan Brown
                          Keymaster

                            Ah! That explains it!

                            in reply to: Jon’s Questions from Training #27107
                            Susan Brown
                            Keymaster

                              One way to help you remember this is to recall that a compressor is a “vapor pump”.

                              From unit 5:
                              The condenser is a lot like the evaporator in that it’s a long, narrow tube coiled up into a small, compact space. The big difference is that the condenser tubing is a lot smaller in diameter than the evaporator, creating a high pressure environment for the refrigerant.

                              Compressed into the condenser by the compressor, the refrigerant’s boiling point is raised but it also heats up, which means it remains a gas at first.

                              In other words, it exits the compressor as a gas. (So the question is one of our infamous “trick” questions!)

                              We also mentioned this in Unit 2, if you want to review the first minute or so of that video.

                              • This reply was modified 6 days, 6 hours ago by Susan Brown.
                              Susan Brown
                              Keymaster

                                Hi Dee,
                                I just checked and the videos played for me, so this must be on your end. The thing that usually clears up an issue like this is to log out and refresh your system – clear your cache, start with a fresh browser window.

                                If that doesn’t fix it, let me know!
                                ~ Susan

                                in reply to: Basic Electricity module 4. unit 7 #27099
                                Susan Brown
                                Keymaster

                                  4 Mega-watts is equal to: 0.004 Giga-watts

                                Viewing 15 posts - 1 through 15 (of 1,968 total)