Susan Brown

[Susan Brown]

This is such a rare occurrence that, in our opinion, Kleinert should not have included it in the list. Overheat and humidity inside the dryer can, on rare occasion, cause increased drum roller noise. But this is not one of the leading indicators we would look for.

[Susan Brown]

Faulty door latch is NOT one of the reasons

[Susan Brown]

For Question 3, “Temperature sensor” is NOT one of the correct answers. The other 3 you chose are. (Thermostat, Pressure switch, Heating element)

The second question I think I didn’t select both of the options.

Correct – you only had selected one answer. There are two correct answers.

[Susan Brown]

Sorry, I didn’t mean which instrument you used. I meant where did you put the two probes?

[Susan Brown]

I had an element 24-oms, with 9.5a, and when I put my meter across the element it was 228v..
This was where i was a bit confused at the time, there was a difference of 7v between supply voltage 235v and the voltage across the load 228v.

There are a couple of things that could cause a small discrepancy in voltage like that. There could be a small resistance (loose connection or something) elsewhere in the circuit. You can also get a small “sag” in voltage (a small decrease in the supply) when a lot of current is flowing. How did you measure the 235v?

[Susan Brown]

1. A twisted door boot

2. Broken drum support spider
Failed support shock/shocks

If those don’t make sense, let me know!

[Susan Brown]

Hi Denis,

I think you were saying before that there would be no voltage drop when there is only one load in the circuit.

If you think I said that, I would want to know where so I can see if I misspoke or wasn’t clear, because that is incorrect.

When current flows through a circuit, there will be voltage drop across any of the loads (resistances) in the circuit. The total voltage drop will equal the source voltage. So, if there is only one load, all of the voltage drop will be across that load.

Please rewatch the second video in Unit 4, particularly starting around the 4 minute mark, where I discuss voltage drop and how to calculate it. Can you tell me what the voltage drop would be across the 40-ohm load in Circuit B?

As for the measurements you mentioned that you did (a ring and a heating element), we would need to see the circuit for those items and where your test points were to help.

[Susan Brown]

Asking questions is good and always welcome!

[Susan Brown]

Hi Denis,
It’s good that you are thinking about this – voltage drop is an important concept!

Every valid, functioning circuit will have a voltage drop because it will have one or more loads in it.

[By “valid, functioning circuit” I mean you have a complete circuit, voltage, and at least one load in it. So current is flowing and the load is doing “work” (movement, heat, light, etc.).]

If you have just one load, the voltage drop across that load will equal the supply voltage. So, if we have an L1-N circuit, with one load, it will have 120v drop across it. That is why we draw circuits with Line on one side of the load and Neutral on the other.

If we have two or more loads, then the *sum* of the voltage drops across the loads will equal the source voltage. And the voltage dropped across each individual load will be in proportion to the resistance of that load relative to the total resistance in the circuit.

I hope that helps!

[Susan Brown]

In a gas burner spark reignition system, how does the spark current return to the spark module after it leaves the electrode?

Through the appliance chassis

[Susan Brown]

Hi Carlos,

It’s a challenging Module! Asking questions is good 🙂

When a shunt is present, *all* the current will flow through it instead of going through the path with a load. That is because there is no resistance in the shunt.

So in circuit B, no current will flow through the heater. That is usually the point of shunts – to bring loads in and out of the circuit depending on what is needed at various times.

As for Req: The most important thing to remember about Equivalent Resistance of parallel loads is the Rule of Thumb: the Req will be something less than the smallest resistance. It’s not too often that being able to calculate it would be really important.

See this Forum Post for more, including another video showing how to calculate it.
https://my.mastersamuraitech.com/appliance-repair-course-support/student-forums/topic/equivalent-resistance-vs-total-resistance/

Let me know if that helps.

[Susan Brown]

Hi Denis,

“Voltage is the same in each parallel branch of the circuit.”

Let me know if you have questions about that.

[Susan Brown]

Thanks!

[Susan Brown]

Thanks! That’s helpful. I’ll get our tech team to answer these.

[Susan Brown]

Hi Daniel,
Thanks for the questions! If any of these are connected to information in the videos in the unit, could you please tell us which video(s) and approximately where in the video? That will help us respond to you more quickly. Thanks!

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