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We usually refer to the shunt as being just the branch with no resistance.
That’s correct!
You are correct that voltage/volts is similar to wattage/watts.
Wattage is the most common way to talk about Power in the electrical world, and watts is the unit of measurement that we commonly use.
We also use the term “work” to describe the output of power from loads.
Power can also be expressed in other ways, such as motion (horsepower), Btu/h (another unit of measurement for heat), etc.
You want to get to comfortable with which terms are interchangeable and/or related, because you’ll hear different ones used in various places.
Hi Michael,
I never noticed that before. We didn’t create this chart, so I’m not 100% sure. But it could be because Power can be expressed as either “watts” or “joules/second”. They are the same thing, and it depends which world you are working in as to which one you use. Academic types would tend to use J/s and those of us in the repair world use watts.
How to use voltage measurements to locate the fault in an electric dryer that is not heating
That’s referring to the scenario that we show at the end of Basic Electricity, unit 6, “Circuit Breaker Panels and Power Outlets”
No worries! I’m about to send you feedback on the ones you did answer, and then you can retake the exam.
Hi Mark,
Good question! Power can describe both input and output.After all, we talk about the “power supply” for a circuit.
And loads need power to do their work. They basically take power (in the form of voltage and current) and change it to another kind of power (heat, motion, etc.).
One of the Ohm’s Law equations is P = I x E. So the power supplied to a load is voltage AND current.
You can have a closed circuit with a resistance/load in it, but it will just sit there until you apply power.
Although many of the other answers are somewhat correct (we designed the question this way to really make you think about it), from a troubleshooting mindset it is Power that we focus on.
Does that make sense? Let me know!
Yes!
Always glad to help – that’s what we’re here for! 🙂
Exactly.
Do you have any other questions, or has this helped it all to click for you? Let me know.
FYI, I’ll need to hide parts of this discussion (so we don’t just give it away to other students), so make note of all of this!
Hi Darren,
If you look at the first video in the unit, there are two operating voltages that are represented in the various examples that he showed: 120vac and 12vdc.
Core Motors module: BLDC motors are introduced in Unit 1, second video. Then there is more on the VFD systems in unit 2.
There’s also a unit on Inverter Compressor Systems in the Refrigerator course (Mod. 1, unit 11)
Correct!
So, we have some voltage present but no current flow. The only logical conclusion is that we do NOT have a closed or complete circuit. Which means we have an open somewhere.
We know the element is not open, so this just leaves two possibilities [answer hidden]
No, resistance resists the flow of current. You only need resistance in a circuit to prevent a short.
We’ve emphasized this in several places – you can just look back at Unit 1 in the definitions, for example.
In order for current to flow, you need two things: voltage and a ________ __________.
As I said, resistance is just needed to prevent a short and actually perform a function (do work).
I just looked back at the email I sent you on June 2nd – I had given you the answer:
“Yes, that step is doing the schematic overview, so obviously you need the schematic diagram for the model you are working on to do that.”
For #20 we mean what actual object do you need to have (either a physical copy or a digital one on your portable device)
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