Susan Brown

[Susan Brown]

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.)

[Susan Brown]

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

[Susan Brown]

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

[Susan Brown]

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

[Susan Brown]

Correct!

[Susan Brown]

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?

[Susan Brown]

Glad to hear it!

[Susan Brown]

Were you able to get the videos to play?

[Susan Brown]

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

[Susan Brown]

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]

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

[Susan Brown]

Ah! That explains it!

[Susan Brown]

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 1 week ago by Susan Brown.

[Susan Brown]

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

[Susan Brown]

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

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