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Hi Kyle,
I’ve sent 2 emails to you with a follow-up question I needed answered before I could finish grading your midterm. Do you get the emails to the address that’s on your student account at MST? (info@adv…)
You got it!
Hi Shannon,
Sorry for the delay in replying, but it looks like you used that time to figure it out!
Yes, you would use that formula. As long as you use the correct current (remembering that the current is the same throughout a series circuit), you’ll get the correct answers.
There’s a way to check your answers, too:
When you add up the 3 voltage drops, what should you get?
Hi Leroy,
Our “Four Main Systems” approach is all about organizing our troubleshooting so that we’ll work smarter, not harder.
When both compartments are warm, it is possible that the sealed system has failed. Before breaking out the tool bag and doing measurements on anything, we would listen to see if both the compressor and the condenser fan are running. If yes, then measurements will need to commence, and the temperature control would be a reasonable one to check first.
Does that make sense? The reason we put the sealed system as the first one to check is that you can determine a lot about it just by listening, and let that determine your next steps.
Hi Ronney,
The module exam is a random selection of questions from the unit quizzes in the module, so it will be different each time.
The best time to get help on questions is when you miss them in the unit quizzes! That way you can just study those for the module exam.
Some of the questions above you also missed on your unit quizzes, some you had gotten correct. What you need to do to prepare for retaking the module exam is go back over each unit quiz. Make sure you understand the answers to the questions, and ask for help here on the ones you don’t.
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!
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