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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?
Those answers are correct! Note – I will hide them so other students won’t see them 🙂
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.
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?
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.
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.
Those are both correct!
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!
Hi Starobin,
L2 is supposed to be hot (120v), but it isn’t in that scenario. There’s an open somewhere on the L2 side preventing current from flowing in the circuit.
Hi Ben,
1. Yes to both, basically. You’ll create the folders in Goodreader, which will also store them that way. It’s straightforward – just start using the app and you’ll see.
2. We don’t have files available as a massive download, nor do we recommend people try to do that. You’ll just end up with thousands of files you will never use. As you know, we recommend you have an SOP (Standard operating procedure) with your jobs that involves downloading the docs you need ahead of time. Occasionally, the file you need will not be in our downloads section and you’ll need to request it. You’ll gradually build up a library of docs for models that are common in your area, and will be adding to it regularly.
The number of times you’ll go on a job without advance notice is small, and then there’s no guarantee that the doc you would need would be in the big stash. So, it’s not worth changing your SOP for this circumstance. And, hey – sometimes the tech sheet is still on the appliance!
There are some questions where you have to do calculations. If you show your work, then that increases the chance that you can get partial credit even if your final answer is incorrect. For example, if you start out with the right approach, but make a math error, you could still get a lot of points. If you simply put down an answer and it is wrong, we can’t give you any points.
Is that what you mean?
By the way, most of the questions are answered by descriptions or definitions, all based on the material that we’ve taught and tested you on in the quizzes. There are only a few calculations that you have to do.
The main thing to keep in mind is that a short is a path from line to neutral or ground with NO load in it. It will result in a fault of some type, usually blown fuse.
A shunt is a bypass around one or more particular loads in a circuit, but not all of them. There will still be at least one load between L1 and N.
Yes. As a result, there’s no current, and thus no work being done.
Right – and what does that tell us about the functionality (or lack thereof) of the circuit?
If you aren’t quite sure, think about what creates voltage drop.
Question #6 – You’re troubleshooting an electric dryer for a no-heat complaint. The schematic is shown below. You start the dryer in a heat cycle and measure 0 V AC across the heater with both wires still connected to the heating element. What does this tell you?
We are measuring across the heater. L1 wrt L2. In other words, looking for voltage drop across the heater.
What does a zero measurement here mean?
Hi Ag,
Closed contacts are the same as a closed switch. Is there voltage drop across a closed switch? Review the Core course, Basic electricity module, unit 8.
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