Susan Brown

[Susan Brown]

Hi Rodney,

I moved this to a new topic, rather than having your question tag onto an old one.

Good job seeing the shunt!

Let’s start with having you answer these two questions –

1. What creates voltage drop?
2. Which of the 4 loads have current going through them?

[Susan Brown]

Hi- yes, this is a different exam. We describe it there on the Midterm unit. It’s a challenging exam, so you definitely want to take it when you will have a block of uninterrupted time!

[Susan Brown]

You’re welcome!

[Susan Brown]

Hi Paul,

Unit 5 will get into that, but the answer is yes. If there is an open anywhere in a series circuit, it will stop current from flowing in the entire circuit.

[Susan Brown]

Hi Roy,

pushes against the magnetic field of opposite polarity

I highlighted the problematic word… can you see how this is incorrect?

[Susan Brown]

Hi Chase,

We did make some improvements to the quiz questions in Basic electricity last week. Sorry for the confusion! However, the two questions that were changed (12 and 13) are not in the pool of questions for the Module exam. You may notice a few others were changed in other units, but those also will not be on the exam.

[Susan Brown]

Good! I just sent you an email

[Susan Brown]

A fuse is a switch which doesn’t do work so there is no voltage drop across it right? Disregard my other answer unless I am wrong here but I believe I am right

That’s it!

[Susan Brown]

That’s right.

In this question, we say,

For the light to be on, what is the correct voltage drop across the fuse?

So, we know the fuse hasn’t blown open, since the light is on. Is it currently doing work?

[Susan Brown]

Loads do some kind of work when current flows through them – produce heat, motion, light, etc. What does a fuse do?

[Susan Brown]

Is this question talking about resistance?

Yep!

[Susan Brown]

Do you remember the two questions we told you to ask when you are considering the function of a component on a schematic? “Is it a _____ or a _____?”

What’s the function of a fuse?

[Susan Brown]

Yep! It’s such a cool phenomenon – electric current being able to induce a magnetic field, which can make things move!

[Susan Brown]

Hi Duane,

You wrote:

Question: I am trying to relate refrigerator frost patterns to home refrigeration unit frost patterns (maybe too different to compare?).

From the rest of your question, I assume you’re trying to relate refrigerator frost patterns to those on A/C units?

[Susan Brown]

No, alternating current is just electrons movement that changes polarity (direction) over time, rather than always going in one direction.

Here are a couple of items of note in the transformer unit:

A transformer basically is a very simple static (or stationary) electro-magnetic passive electrical device

When an electric current is passed through the primary winding, a magnetic field is developed which induces a voltage into the secondary winding

[Author]

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