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Electric Engineering 201

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Maplen13
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« Reply #40 on: September 20, 2009, 11:42:04 am »

I mean the formula, Which right now I traced it back to something with factorials, Now I remember.



First part of that equation, not the rest.
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« Reply #41 on: September 20, 2009, 11:43:36 am »

JWalker, please do not double post.. it is spam.
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« Reply #42 on: September 20, 2009, 11:45:04 am »

That symbol is the summation symbol.  It means the sum of all currents = 0.
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« Reply #43 on: September 20, 2009, 11:46:19 am »

MsRR, Wasn't there a topic, of "When it's ok to double post" But for this topic, everything is moving, and maybe time to modify a topic, isn't that fast, and maybe someone would over look that, which legodac miss my modified posts over two times, in this topic alone. now Back on topic shall we?

That symbol is the summation symbol.  It means the sum of all currents = 0.

Oh!! Thanks!
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« Reply #44 on: September 20, 2009, 11:51:41 am »

Maple, that was for shops. We do not want chaos in the " classroom" so let's use the edit button please.

We will not use the symbol "E" to represent Voltage.  E stands for electromotive force, and that is only used in physics.

Jwalker, since we have members here from many countries, perhaps it is best to have some tolerance of that.
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« Reply #45 on: September 20, 2009, 11:52:50 am »

I didn't think of that... I'll take that into consideration now. 

Since I'm not the only person teaching here, would somebody else like to explain KVL?
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« Reply #46 on: September 20, 2009, 11:55:16 am »

Maple, that was for shops. We do not want chaos in the " classroom" so let's use the edit button please.

We will not use the symbol "E" to represent Voltage.  E stands for electromotive force, and that is only used in physics.

Jwalker, since we have members here from many countries, perhaps it is best to have some tolerance of that.

Yea, I known it was for shops, but still.... Legodac missed my "What program you used?" After I modified my posts, two times... Must be bad luck... or many posts at the same time..

Yea.. I'm in another country with 110 for American, and 220 for this country, because with my accident with my AVR, and an American Computer with a 220 volt, and touching it, gives me spark, and..... BAM!!!! A sudden sparky sound, and my heartbeat.


Sorry for any rush, but do we have another lesson here? Because I have to go to bed, sorry, It's 1:08AM in a Monday, and lots of things to do.
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« Reply #47 on: September 20, 2009, 12:02:34 pm »

Nah, I'll just leave it like this.  We'll go over KVL next time.
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« Reply #48 on: September 20, 2009, 12:03:36 pm »

Kirchhoff's Voltage Law describes the distribution of voltage within a loop, or closed conducting path, of an electrical circuit. Specifically, Kirchhoff's Voltage Law states that:

The algebraic sum of the voltage (potential) differences in any loop must equal zero.
The voltage differences include those associated with electromagnetic fields (emfs) and resistive elements, such as resistors, power sources (i.e. batteries) or devices (i.e. lamps, televisions, blenders, etc.) plugged into the circuit.

Kirchhoff's Voltage Law comes about because the electrostatic field within an electric circuit is a conservative force field. As you go around a loop, when you arrive at the starting point has the same potential as it did when you began, so any increases and decreases along the loop have to cancel out for a total change of 0. If it didn't, then the potential at the start/end point would have two different values.

Positive and Negative Signs in Kirchhoff's Voltage Law
Using the Voltage Rule requires some sign conventions, which aren't necessarily as clear as those in the Current Rule. You choose a direction (clockwise or counter-clockwise) to go along the loop.
When travelling from positive to negative (+ to -) in an emf (power source) the voltage drops, so the value is negative. When going from negative to positive (- to +) the voltage goes up, so the value is positive.

When crossing a resistor, the voltage change is determined by the formula I*R, where I is the value of the current and R is the resistance of the resistor. Crossing in the same direction as the current means the voltage goes down, so its value is negative. When crossing a resistor in the direction opposite the current, the voltage value is positive (the voltage is increasing).

Kirchhoff's Voltage Law in action:
depicts a loop abcd. If you begin at a and advance clockwise along the interior loop, the Voltage Law yields the equation:
v1 + v2 + v3 + v4 = 0
In this case, the current will also be clockwise. Crossing the resistors will result in v1, v2, and v3 all being negative. Since you're crossing from negative to positive, v4 will be positive. If you consider the dotted line that has the R5 resistor, you get a total of three loops in the circuit. The first one has already been described. One loop is the largest loop and another is the smallest loop at the bottom, to yield the equations:
v1 + v2 + v5 + v4 = 0 (abcd taking the new path instead of R5)
v3 + v5 = 0 (the small loop cd)
The second equation indicates that v3 = -v5. This makes sense, because both currents will be travelling from c to d, so on the small loop you'll cross one resistor with the current and the other resistor against the current. If the resistors are of equal value, then the current in both paths will be equal.
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« Reply #49 on: September 20, 2009, 12:05:03 pm »

Nah, I'll just leave it like this.  We'll go over KVL next time.

K, oh, and a question, What grade level do you think studies... Cellular Respiration, Krebs Cycle, Photosynthesis in detail(not the simple)?

Wow.... MsRR.... *Copies whole thing and posts it into Microsoft Onenote* I just don't have enough time to review that all...
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« Reply #50 on: September 20, 2009, 12:56:01 pm »

Go to sleep.. it will be here tomorrow Smiley
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« Reply #51 on: September 20, 2009, 10:05:43 pm »

Ah... Well it is "tomorrow" already, but going off topic, what kind of grade level studies Cellular Respiration, Krebs cycle, mitochondria, and the complex photosynthesis of the Calvin cycle/Light-Dependent Cycle?
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« Reply #52 on: September 22, 2009, 02:34:49 am »

So many years since I took those type of classes, I think JWalker would be better able to answer that.
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« Reply #53 on: September 22, 2009, 09:16:01 am »

Ah.... Well... I wonder if class would be in session somewhat... *waits patiently*
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« Reply #54 on: September 22, 2009, 11:51:34 am »

Sorry, I caught a cold Sad.  I don't think I'm gonna be able to give any more "lecture" until I get better.
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« Reply #55 on: September 24, 2009, 08:11:11 am »

Oh...  Sad I'm quite sorry to hear that, but oh well... I can try doing some lua scripting language help....
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