Susan Brown

[Susan Brown]

Hmmm – a “Womanometer” sounds like one of the Samurai’s jokes. Which quiz is that on?

This is true: “the Samurai said that its important to use a meter with a high impedance input…”

We discuss that in Basic Electricity, Unit 7 in the “Loading vs. non-Loading meters” section. I don’t believe it is covered anywhere in Kleinert’s book.

[Susan Brown]

Hi Ben,

This is just one of those wording things. You have the right ideas.

“In order for something to have a voltage drop, it must have…” and current is the correct answer.

In other words, current flow is a necessary condition if there is to be any voltage drop.

It’s not saying that current flow through anything creates a voltage drop. As you point out, current through a closed switch won’t have voltage drop. But we’re not implying that with the question.

We’re not trying to be tricky, but to encourage thought. One reason we emphasize the distinction between voltage and voltage drop so much is that too many techs focus on voltage readings without paying attention to current/power. This mindset helps to avoid making that mistake. And that’s why this question is encouraging you to zero in on “current flow” as the most important causative factor of voltage drop.

[Susan Brown]

Hi Danilo,
Yes, you are correct. The most important piece of information in that question is “open switch.” That means no current. Good job!

[Susan Brown]

Done!

[Susan Brown]

That’s it! Do you want a reset?

[Susan Brown]

Are you looking at the Schematic or the Wiring diagram? The schematic is much easier. (As is usually the case.)

[Susan Brown]

First, let’s make sure you are looking at the correct light. There is a single “surface indicator light” in one location on the schematic, and then there are 4 hot surface indicators lights, one for each burner. You want to find the LF light in that set.

Let me know what you are looking at – how is it labeled?

[Susan Brown]

These are 4 types of coils found in gas dryer valves. All you need to know for the Midterm is that they are “loads” with resistance.

Did you read the Help Page advice on this question?

[Susan Brown]

That is definitely what those readings are showing you. Think about that 0v reading across the known-good element. There is no voltage drop, so we know there is no current in the circuit. We have some voltage, but no current. What does that tell us in terms of the state of the circuit? Is it open or closed?

[Susan Brown]

Those answers are correct! Note – I will hide them so other students won’t see them 🙂

[Susan Brown]

Hi Travis,

For current/amps it is good to keep one decimal place, so 6.6 or 6.7 amps would be appropriate here. That will make your answer just a little bit higher.

[Susan Brown]

Yes, when the switch is closed, this shunts the main coil, as all the current will use that path to get to N. So, if the Main coil receives no current, will it have a voltage drop?

How does that leave the ignitor and the booster? You can tell by doing the “Zen trick” on them. Do they have to go through the Main to get to N?

[Susan Brown]

Hi Brian,

We can help you here.

My first suggestion is that you go through this post, if you haven’t already. Be sure to go through slowly, taking notes and copying the calculations that we show.

https://my.mastersamuraitech.com/appliance-repair-course-support/student-forums/topic/math-and-ohms-law/

Then, for Questions 7 and 8 in the Unit 8 quiz, rewatch the “loose connection” video at the end of Unit 3. The scenario is similar – two resistances in series. See if you can follow what we do on the video and recreate it on paper. Let me know if there are any steps you don’t follow.

[Susan Brown]

Those are both correct!

[Susan Brown]

Excellent!

That is exactly how learning is supposed to happen. You go over material, get as much as you can figured out, the periodically revisit it when you realize you don’t have it mastered yet, which helps it to click in even stronger. It is not a completely linear process.

You’ve described good study habits – thank you!

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