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Hi Jonas,
Thanks for posting a question!
Yes, the * symbol is the same thing as x . Both are “times”, or multiplication.
You might have just made this up as an example, but I want to make sure you know that V=W*R is not a valid Ohm’s Law equation! It would be V= I * R (voltage equals current times resistance)
Hi Abbey,
Thanks for posting a question! We show this in several examples in the Basic Electricity module, but just to be clear: when you have loads in series in a circuit, the total circuit resistance is simply the sum of the resistances of the loads.
Again, this is a series circuit only. Loads in parallel are different. We can calculate an equivalent resistance with those, which we describe more in Unit 5, and also in this Forum thread:
https://my.mastersamuraitech.com/appliance-repair-course-support/student-forums/topic/equivalent-resistance-in-parallel-circuits/September 12, 2019 at 5:15 pm in reply to: Basic Electricity: Voltage, Current, Resistance, and Power #16590Hi Abbey,
It all depends on what information you are given.
If you look on the Ohm’s Law “Pie chart”, there are 3 equations that can be used to calculate current (I). You choose the one that best fits the scenario you have.
What info about the circuit do you have?
Hi Desert,
The first step on this question is to figure out how the loads are laid out in relation to the others. Are they in parallel? Series? Are all loads receiving current? (that’s an important one!)
The “Zen trick” is a great help in figuring this out.
let me know what you think.
LOL – Some threads can confuse rather than clarify, depending on the number of people chiming in – you can always start your own if there’s something you’d like to try to clear up!
Hi Robert,
The Danfoss app can be set to either gauge or absolute.
September 6, 2019 at 3:15 pm in reply to: Basic Electricity Current Flow in Parallel Circuits #16481Hopefully you just misheard something we said.
I’m very glad to hear about the new job and that your being in our training helped! It doesn’t surprise me – we do have a good reputation! It’s too bad his other techs won’t take him up on the offer.
September 5, 2019 at 9:25 am in reply to: Basic Electricity Current Flow in Parallel Circuits #16474but I had found a statement from the training that current was the same in parallel circuits
Can you tell me where this is in the course?
“current varies in each branch of a parallel circuit depending on the total resistance of loads in each corresponding branch of the parallel circuit. However, the current will be the same outside of the branches.”
Yep, that’s it. Also, the total current will equal the sum of the currents in the individual parallel circuits.
If you look over our quiz questions for Units 4 and 5, it’s pretty clear how current behaves in series and parallel circuits.
September 4, 2019 at 10:53 am in reply to: Basic Electricity: Voltage, Current, Resistance, and Power #16471Hi Sean,
Have you watched the video at the end of Unit 3 where we show how to do the calculation, using slightly difference numbers for resistance? Try imitating our calculation yourself on paper. If there’s a step you don’t quite follow, tell me what it is and I’m happy to help you further.You figured it out! And so glad to hear you’re enjoying the course so far – thanks for letting us know!
Yes, that’s what it is good for!
Current depends on the resistance in a circuit.
The only generalization you can make about parallel circuits is that they each have the same source voltage, since each branch is tied to Line and N (or L1 and L2 if a 240 circuit).
The current going through each parallel branch will depend on the resistance of the load(s) in the branch. Only if each branch had an identical load would the current would be the same.
Does that help?
You got it! The key to this question is recognizing the shunt. Everything falls into place after that.
When the detector switch is closed, they will all go through that circuit, since it has no load.
By definition, (which we gave in Unit 1 and also talked about in more detail in Unit 5) all the current will go through a shunt, if one is available. It’s how loads are controlled in a lot of circuit configurations – switches sometimes close to create a shunt that bypasses a load so that it won’t do any work.
An unintended shunt (that happens by accident) is a “short”.
Hi Shawn,
A lot of people call those “finger drivers”. We got ours at our local hardware store, but here’s an example at Amazon:
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