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That’s correct! Good job.
(I’ve hidden your answers so others can’t see them)
From the TST presentation in Module 5, Unit 3:
“Where multiple loads are affected, select any inop load as your LOI and work the problem. You’ll end up at the same root cause.”
June 14, 2017 at 2:44 pm in reply to: Module 1.3 unit 5 did not allow me to retake test completely #12152Sorry to hear the computer gods were not smiling upon your efforts last night!
I’ve reset you so you can take the quiz again.
🙂
Hi Ronney,
Both of these involve the same circuit with two loads in series.
You are asked to calculate the heat generated by each of the loads.
I’m not sure where you are having trouble, I’ll point out a few things to know and review, and you can write back and let me know.
To do this problem, you need to understand work/power: current flowing through a load causes work to happen. Review unit 3 on power and how to calculate it.
In fact, Unit 3 has a lot of helpful stuff relating to these questions. The “loose wire” scenario in the last video is essentially the same as these problems – two loads in a series.
Look back over that, and then let me know more specifically what you need help with on these questions.
I’m glad you asked, since this is an important thing to understand.
We are showing a circuit with two loads.
What is a load? It is a component that has resistance, right?
The problems says “when everything is working correctly”… so, we assume that we have a complete circuit and proper voltage, thus current is flowing.
What happens when current flows through a load?
Yes! Good job. It will always be something less than the smallest resistance.
Right.
So what your meter will measure is what we call the “equivalent resistance” of those two parallel loads. The equivalent resistance is taking the resistance of loads in parallel and theoretically combining them into a single load.
(FYI – In a series circuit we would calculate the “total resistance”, which is just the sum of the resistances.)
For parallel loads, we described how the “equivalent resistance” can be calculated in Unit 5. We also gave a rule of thumb in one of the videos.
Do you know the rule of thumb? If so, you’ll be able to get the answer to this question correct. Let me know!
We are taking an “ohms” (resistance) measurement.
There are two loads in that circuit: the defrost heater and the drain heater (the bimetal is just a switch).
Are they in series or parallel with each other?
Hi Michael,
There are a few things you need to be able to know to get this answer. I’ll step you through it.
First, do you understand what measurement we are talking about from Pin 13 to Pin 7?
Yes – that is exactly what is happening there!
Hi Thomas,
Sure – I just reset you.
BTW – the best way to ask for a reset is to use our Contact form at the site (“contact” in the main menu).
Although hopefully you’ll have more regular meals so you won’t need a reset again!
🙂Do you see where the Noise Filter is on the schematic? It shows the line and neutral coming into it, along with the color of the wires.
Yes – just did it. Thanks for the reminder 🙂
HI Matthew,
Great job – those answers are correct!
I hid them so we don’t just give them away to other students.
Yes, this is the right place to ask about the Midterm.
Questions 7 and 8 are about series and parallel circuits:
– being able to recognize which configuration you’ve got in a diagram (are the loads in series with each other or parallel?)
– recognizing special situations like shorts and shunts
– understanding the behavior of current, voltage, and voltage drop in both types of circuits.That material is covered in units 4, 5, and 8 of Basic Electricity
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