Susan Brown

[Susan Brown]

Hi Denis,

First of all, have you read the summary of voltage and voltage drop at this pinned topic?
https://my.mastersamuraitech.com/appliance-repair-course-support/student-forums/topic/voltage-and-voltage-drop-summary/

Voltage drop is specifically the difference in charge that we measure across one or more loads when current is running through the circuit.

If current is not running through a load, then there will be no voltage difference across it.

Does that help? Read through those, and let me know if you have follow-up questions.

[Susan Brown]

Hi Zach,
Some of the units in Module 2 do not have quizzes. Instead, they just have the “mark as complete” buttons. If there is a quiz, it won’t let you move forward until you’ve taken it.

So – you’re all set!

[Susan Brown]

Since we’re discussing actual answers, I’ll reply to you via email 🙂

[Susan Brown]

My last gas cooktop had infinite switches 🙂

[Susan Brown]

Yes, each machine will have its own “key dance” to enter diagnostic mode, so the correct answer is, “Look it up on the tech sheet”

Let me know if you have any other questions.

[Susan Brown]

Okay!

[Susan Brown]

4 Megawatts is 4,000,000 watts (You can type 4 megawatts in your search engine to see how many zeros it has, if you forget that Mega means 6 zeros. Mega = million)

The possible answers are:
A. 400,000 watts
B. 400 kilo-watts
C. 0.004 Giga-watts

So A is obviously not right.
A kilo is 1000, so 400 kilowatts is 400,000 watts (add 3 zeros to the end of the 400). So also not right.
C. Must be it. Let’s see: a Gigawatt is 9 zeros, or 1 billion. 0.004 x 1 billion = 4,000,000. yes!

Occasionally you have to know these things – but you can use your search engine to help you do the conversions. It’s good to know how to do!

[Susan Brown]

Hi Yehoshua,

Read this topic and see if it helps. You haven’t gotten into parallel circuits yet, so don’t worry about that part.

If there is a particular quiz question you want me to step you through, let me know and I’m happy to.

https://my.mastersamuraitech.com/appliance-repair-course-support/student-forums/topic/voltage-and-voltage-drop-summary/

[Susan Brown]

We don’t currently have access to a scale, but our best guess is about 30 pounds.

[Susan Brown]

Hi Jesse,
No, we don’t have something like that. The examples we use in the course are on just a small percentage of the thousands of models out there.

Are you wanting the manuals for when you are working on jobs? That is what Appliantology is for!

Be sure to activate your free 6-month Student Membership there. See the “Appliantology 101” short course at MST for how to do that.

[Susan Brown]

Do you recognize these? You had the same scenario on the Midterm Exam in the Core course (the diagram just looks a little different).

Remember that when you have a single load in a circuit, that it will drop the full source voltage. Only loads in series will split the voltage drop. Loads in parallel will behave independently of the others.

The Safety is the clearest example of this – it is parallel to the other circuits.

The Main coil is wired in series with the Ignitor and Booster, which are in parallel to each other. However, the closed detector switch has a big impact on these circuits – it is what allows us to answer the questions without doing any calculations.

Is this ringing any bells?

[Susan Brown]

“open” is a better term than “missing”, but yes, L1 is the side with the fault.

[Susan Brown]

The fact that I’m reading 0 across the heating element means that there is an issue with one side of the 120s

That is correct, although you can be more specific about what you mean by “issue”.

240 being direct current only reading 120

I’m not sure what you mean here. This is an AC circuit, not DC. Is any current flowing in this circuit anywhere?

When we measure L1 wrt N or L2 wrt N, we would expect to read 120v each, because we’re just measuring one phase of power.

Where would we normally expect to read 240v in an L1-L2 circuit?

L2 is not present. When you disconnect it it’s just reading L1 threw out the circuit . l2 is open

Are you looking at the diagram on the Midterm? (It is a little different than the similar one in unit 6.) Which measurement changes after we disconnect one side?

[Susan Brown]

Correct! I moved your topic on Question 9 to a new topic

[Susan Brown]

Okay, good!

The Safety is 120v.
The Main Coil is [answer hidden]

How does this leave the Ignitor and the Booster?

• This reply was modified 7 months ago by Susan Brown.

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