Susan Brown

[Susan Brown]

We talk about the ice ball about halfway through the video in that unit.

[Susan Brown]

Look at the photo in Unit 2 of several different evap frost patterns. Which one matches the description?

[Susan Brown]

just did

[Susan Brown]

That’s a correct statement. The answer choices we give you for that question aren’t quite so detailed, but I think you’ll know which one is correct.

[Susan Brown]

Right! So, you can only assume there will be some kind of start device, but not which type. The correct answer has to do with the type of windings that all split-phase motors will have.

[Susan Brown]

Is the only start device a PTC type?

[Susan Brown]

Right, which of course wouldn’t be that big of a deal with other types of appliances, but no one wants to risk their food spoiling just because of a nuisance trip.

[Susan Brown]

We describe this in the first video during the section on PTC start device failure (starts at about 21 minutes, 25 seconds into the video)

[Susan Brown]

You are correct! Good job!

[Susan Brown]

Hi John!

Yep, this is just a matter of getting the terminology straight.

We should always refer to parallel circuits, plural. Each branch is a circuit with one or more loads. If loads are in parallel with each other, they are technically in different circuits, even if they are tied together at some point.

Does that make sense? You can tell if loads are in series or parallel with each other by doing the Zen Trick.

If two loads are in parallel, will the current be the same or different through them?

[Susan Brown]

Yep! I just wanted you to see how Ohm’s Law equations can be used to think through these things when you aren’t sure. But a fuse is basically a switch, and therefore acts like a wire (essentially no resistance, thus no voltage drop), unless of course it blows open.

[Susan Brown]

I wrote my response only having seen your 69.99 answer.

The 0.014 is perhaps correct. Isn’t that essentially zero?

[Susan Brown]

Rt would usually designate the total resistance for a circuit. We’re just concerned with the fuse.

I didn’t say your answer wasn’t correct, but I want you to KNOW the answer, not just guess.

You need to think about what a fuse is. Is it a load with resistance? What is its role in a circuit?

[Susan Brown]

That’s right – and what would R (the resistance) be for a fuse?

[Susan Brown]

Hi Bryan,

Let’s check your answer with an equation. What is the typical Ohm’s Law equation that we would use to find voltage?

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