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Hi Robert,
It looks like Danfoss made some updates to their data since the time we made those videos.
That’s definitely on the right track – it depends what exact number you mean for the one that drops “less”, and which load it is. You can email the answers to me so that I can give you better feedback.
Here’s the answer:
Because the two compressor windings are in parallel, you take the equivalent resistance of those first, then calculate equivalent resistance again using that and the resistance of the fan.
Although, since you know that the equivalent resistance will be something less than the smallest resistance, you can also figure out the answer without carrying out all the calculations.
Let me know about the reset…
Hi Chase – I’m checking with the tech experts to make sure I give you the correct answer and will get back to you ASAP. You did pass the quiz – are you sure you want a reset?
great! I just reset you.
Do you want me to reset that quiz so you can retake it?
Hi Eugena,
You’re talking about how the LOI gets L1 and L2.
Good job being “Zen-like” 🙂
What you see is correct, although there is one additional way you can potentially reach L1.
(In other words, there are 2 correct answers to Question 2)
The “inverse of the Rs” formula is for finding equivalent resistance of loads that are in parallel.
When you have loads in series, you want to find total resistance (in order to do things like calculate the circuit current), which is just the sum of the resistances.
Good question!
No, you put the probes on either side of the load. You want to measure one side of the load with respect to the other side.
Rewatch the second video in Mod. 3, unit 8, and look for when he measures voltage across the light bulb that is lit up – that is an example of measuring voltage drop.
Yes, you can calculate voltage drop using E=IxR, but you only have to do that when you have more than one load in series in a circuit.
What if you have only one load in a circuit – what would the voltage drop across that load be?
(This is a big hint that should help you get part of the way towards figuring out Question 8)
Hi Nathan,
Start a new topic here in the Forums about this question and we can help you. I sent the student above an email because he had answers on his exam that I wanted to comment on privately.
Did you look at the Midterm Help Page? We give you suggestions:
https://mastersamuraitech.com/midterm-exam-help-page/
For question 7, we say:
Make sure you understand the scenario. These parallel circuits are functioning normally, then the top branch (element) fails open. We want to know the change in current or voltage drop in the branches and then the overall current draw from L1. The videos at the end of Unit 4 are particularly helpful to review, but also Unit 5.
I know the feeling! I also studied ChemE in college. This electrical stuff takes some work!
Check out this topic and see if it helps:
Hi Jim,
The videos at the end of unit 4 are good to review for this one.
When you have circuits in parallel, and one of the circuits goes open, it will not affect any other of the parallel branches. It will affect the overall current and the equivalent resistance of the entire set of circuits.
The resistance of the bulb is what it is, and the voltage supply to the bulb doesn’t change, so the current through the branch that hasn’t failed will not change.
Does that help?
Happens to us all! 🙂
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