Susan Brown

[Susan Brown]

Hi Dean,

We discuss and demonstrate Half Splitting in the second half of this unit:

https://my.mastersamuraitech.com/module-5/using-schematics-to-troubleshoot-appliances/

[Susan Brown]

Okay, I see what’s going on.

1/30 is 0.033333…

So, the difference is just in the rounding. You used 0.03.

1/.0533 = 18.75

Not a significant difference as far as ohms readings go, so either result would be fine.

[Susan Brown]

1/.02 + 1/.03 = 1/.05

That’s not quite the formula, and it’s also not the way you can add fractions. Let’s back up a bit and step through it.

The two resistances are 30 and 50 ohms.

So the formula is 1/(1/30 + 1/50)

The rule with multi-step calculations is that you always do what’s in the parentheses first.

What is 1/30 + 1/50? (It is not 1/80… use your calculator to turn each fraction into a decimal number… 1 divided by 30, etc.)

Then add those two decimal numbers together.

Then you would do 1 divided by that result.

What do you get?

[Susan Brown]

What is Kirchhoff’s Law? (from Unit 8)

[Susan Brown]

It depends. What if a load is the only one in the circuit? Do you need to calculate the voltage drop using an equation?

[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?

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