Susan Brown

[Susan Brown]

Correct, so the closed switch is a shunt. It bypasses the heater, but current is still going through the bulb, which means it is not a short.

[Susan Brown]

Doesn’t the current still have to go through the light bulb?

[Susan Brown]

And the switch let’s current get to the bulb without it going through the heater also

That is correct.

A shunt or short I have trouble telling them apart

A short allows current to go from Line to N without going through another load. Is that the case here?

[Susan Brown]

Wouldn’t the bulb get brighter with the switch closed

Yes – and why is that?

And the switch not matter when it comes to the heater heating

The switch does have an impact on the heater. Remember, a closed switch doesn’t have any resistance. When the switch is closed, it creates a special condition that we talked about in this lesson. Do you have any idea what that is?

[Susan Brown]

Can you describe how the current flows in A and B? What changes when that switch is closed in B?

[Susan Brown]

Hi Cooper,

We are talking about this diagram, correct?

[Susan Brown]

Oh – I think I figured it out. Mod. 4, unit 1, correct?

If you use E in the calculation of P, it has to be the voltage dropped across the load in question, not the source voltage. You could find the voltage drop across the element, but it’s usually easier to find the current instead, then use I^2 x R.

This is something we spend some time on in the Core course. Do you know the distinction between voltage and voltage drop in the context of an appliance circuit?

[Susan Brown]

Hi John,
Which Module and Unit is the video in?

[Susan Brown]

Appliantology! Have you signed up for your free 6-month student account yet? See the Appliantology 101 short course – Unit 3 has the info on setting up the membership.

[Susan Brown]

Hi Peter,

I just did that for you. For future reference, if you should need it, please use the Quiz & Exam Reset Request form. You can find that in the “Campus Support” menu. It will make sure you get the fastest response.
Thanks!

[Susan Brown]

We appreciate hard-working students such as yourself!

[Susan Brown]

That is the only link we have (a student provided it – not us), and it still goes to the correct book.

[Susan Brown]

Hi David,

First of all, you have two attempts on both parts of the Final Exam, and the questions remain the same each time you take it. So – don’t be too worried. You would have plenty of opportunity to correct any that you missed the first time around.

The Final exams are, for the most part, more similar to the questions you encountered on the unit quizzes. Predominantly from Modules 4 through 9. There is a higher passing rate on these than the Midterm Exam, FYI.

So, if you have reviewed the units and quizzes, you should do fine. Remember – you can refer to the course material during the exam, but it’s best to have it open in a separate window or device.

[Susan Brown]

Hi Moby – it worked for me. Just took a little bit to load. What browser are you using?

[Susan Brown]

The third option was, “Efficiency doesn’t matter — that venting material is unsafe to use.”

So – you had the right thinking, but perhaps you didn’t read the answer choices carefully enough.

[Author]

Posts