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Hi Kenneth,
What is your question about 4 megawatts? Are you trying to convert it to something different?
Hi Joshua,
No point in googling other resources when you’ve got the ultimate resource right here – Team Samurai! A lot of what your tuition pays for is the ability to ask us questions here in the Forums.
We need to address these questions one at a time. Let’s start here with question 7.
(By the way – I’m going to hide the question in your post above, so that other students won’t see it before they take the Midterm themselves.)
Question 7 has two parallel circuits, and at first we assume everything is behaving normally – current is flowing through both branches.
Then, the top circuit (with the element in it) fails open. You gave us the correct answer for what happens to current in that branch. But then we ask what will happen to the voltage drop and current in the fan motor circuit.
Do you recall what we taught about parallel circuits, in terms of how a failure in one branch affects another?
Hi Joshua,
Happy to help! First of all, these loads have different resistances. Will that affect the voltage drop across them? Isn’t there a relationship between resistance and voltage that we taught?
Hi Mohamed,
We’re talking about the size of the letters or numbers used on a schematic. They tend to use large letters for the various safety warnings (which professional techs are already aware of). But the key information needed for troubleshooting – specifications for the loads, for example – are often in small letters/numbers. In other words, for a professional tech, the most important information is usually the smallest.
Hi Robert,
Think of their function in the circuit, and that will help you know the answer to this. Also, we teach this in Mod. 3, unit 7 (skim through the text of that unit and you’ll see).
Hi Kenneth,
This is the Ask the Teacher Forum! If you want help with something, you can start a new topic. Did you watch this video on how to do that?
Do you check the little box that says “Notify me of follow-up replies via email” ? That’s a very helpful thing to do. As for looking at this page, it doesn’t auto-refresh. You have to reload the page to see new replies.
I’ve reset you for that quiz. For future reference, there’s a Quiz & Exam Reset Request form that we want you to use. Just look under the “Contact Us” item in the main menu.
Also, keep in mind that Module 3 is very challenging. Please keep asking questions here in the Forums so we can help you.
We didn’t discuss Question 11. We have a video in Unit 3 that goes over this calculation (with slightly different numbers for the resistances). Watch that again, and try to do the same calculations we show you in your own notebook. If there are steps that you don’t quite follow, just let us know and we can help you.
E or V is fine for volts. Our chart in Unit 3 uses E. Did you see my reply above?
Actually, the chart in Unit 3 uses “E” for voltage, but some other charts do use “V”. As long as you know either of those letters is “voltage”.
So, you are given “P” and “E”, and we ask you to find R.
This means you need to find an “R = …” equation in the pie chart that uses E and P. Can you see which one?
Hi Rees,
Thanks for posting a question here! Yes, it can take a little time getting used to working with equations and such if you haven’t had much experience with it. But we are happy to help.First of all, the Basic Electricity module is one of the toughest ones for many of our students. I tell you that just so you won’t get discouraged. Some guys mistakenly think if the 3rd module is difficult, they won’t be able to handle the rest of the course. Not so. So, hang in there!
Secondly, some of these units do require going through a few times. Are you pausing the videos as you watch them to take notes? Do you try to recreate the calculations that we show you in your notebook? These are the types of study habits that will help you.
The other thing that would be helpful is to identify more specific points in the unit where you don’t follow what we are showing you, so we can give you more help here in the Forums.
Let’s start with Question 7. “A heating element has a rated wattage of 5600 watts and is connected to a 240 V AC source. What is the resistance of the heating element?”
The first way to organize your thoughts is to identify what information we are giving you, and what we are asking you to find.
Given:
heating element – 5600 watts
power source – 240vac
Find:
resistance of elementCan you tell me what the symbols (letters) are for those 3 items? (the ones we used in the Ohm’s Law chart)
Great! Don’t hesitate to post in the future if there’s anything else you’d like more help with.
Yes! I know it might seem like a minor point, but for a load (or loads) to do work, the circuit needs both voltage and current. (P = I x E) A lot of techs think in terms of ohms (which is very weak) or perhaps voltage or current, but rarely in watts. We’re wanting our students to keep power in the forefront of their thinking when it comes to loads doing work.
Older appliance tech sheets nearly always gave specs in “watts” for loads. Now we notice that they don’t do that as much, because too many techs didn’t know what to do with watts, so they often just give the resistance (ohms). Problem is, ohms is not always a reliable test. Watts is the stronger one.
Thanks for posting this question! Let me know if you have any other questions about that.
You’re getting warmer! Voltage drop is actually an effect of current going through a load. (On the other hand, “regular” voltage is the difference in charge that causes current to flow.)
Let me try this a different way. The answer is one of the terms in the title of Unit 3!
Hi Phillip – our downloads section is over at http://www.Appliantology.org
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