Electric Engineering 201

[Legodac]

"raises hand" Hello and welcome to MLNO, I'd like to join your class if I may. BTW, where are you getting your images from?

[Maplen13]

Oh... ok, No further questions.

That style looks like from wikipedia... legodac

[MsRowdyRedhead]

Pop Quiz!

1.According to the International System of Units, what’s the official base unit for measuring electrical current? (Examples: meter measures length, second measures time.)
2.What 1970s science fiction film recounts electrical engineer Roy Neary’s long, strange trip to Wyoming…and beyond?
3. In 1844, Washington DC and Baltimore became the first American cities connected by what method of communication?
3. What Austrian-born electrical engineer, who patented a form of spread-spectrum still used in wireless communications, has a star on the Hollywood Walk of Fame?
5. German physicist Heinrich Hertz discovered and experimented with what form of electromagnetic radiation?
6. What device did Harold P. Brown invent in the late 1880s to help Thomas Edison publicize the dangers of alternating current?
7. The US Supreme Court upheld the radio-related patents of what inventor in June 1943, five months after he died?
8. After 1941, “radio direction finding� became known by what more popular acronym?
9. After the transistor was invented in 1947, it replaced what device in most electronic equipment?
10. Before inventing the Moog synthesizer, Robert Moog sold kits for building what other electronic musical instrument?


[spoiler]
1.ampere (or amp)
2. Close Encounters of the Third Kind
3. telegraph
4. Hedy Lamarr
5. radio waves
6. electric chair
7. Nikola Tesla
8. radar
9. vacuum tube (a.k.a. thermionic valve; also accepted “tubes�)
10. theremin
[/spoiler]

[[5025]]

Sure, have a seat .  

Also, I'm getting my pictures from Wikipedia.  I am cross checking them with my Circuits book to make sure that they are accurate.

[Maplen13]

Awww.... You said it before I modified my post.... and MsRR, forgot the Spoiler didn't work.

[[5025]]

That was a nice quiz, but I wouldn't have given it to anyone who hasn't taken the first half of Magnetic Physics.

[Maplen13]

Magnetic Physics? Oh my *Faints* Does it have electric-magnetic physics, and how it is one of the four major forces in the universe? And how it's like Earth's, Sun's Plasma Magnetic field?

[[5025]]

No offense, but it's very difficult for me to understand what you're trying to say.

[Legodac]

Thanks, I'm still trying to figure out this program I just bought, it's very cool, the only problem I'm having is trying to get the diagrams here, btw, I remember Ohm's law as I=E over R where E is electro motive force, which is also known as voltage

[MsRowdyRedhead]

 What is the difference between a Verilog task and a Verilog function?



Given the following Verilog code, what value of "a" is displayed?
always @(clk) begin
a = 0;
a <= 1;
$display(a);
end

[Maplen13]

Sorry... :-[

I was going to say when you said "Magnetic Physics" And I was imedeately thinking of..
Electric-Magnetism
The Earth's and Sun's Magnetic field
Electric Magnetism being one of the major four forces in the universe
And yea...


Legodac, what program is it?

[[5025]]

Alright, now we will go over Kirchhoff's Voltage Law (KVL) and Kirchhoff's Current Law (KCL).

Just a quick thing that I want to tell everyone.  Eventually, you will probably abandon both of these laws, and switch to either Mesh Currents Law, or Nodal Analysis, depending on which one you like more.

KCL basically states that the sum of all currents entering a node, must equal the sum of all currents leaving a node.  I will make the analogy of pipes.  In the electric world, Ground is 0 potential or 0 Volts, and all current will be directed towards the ground node.  The same is true with pipes.  If you have a Y joint, and there are two flows coming in from the top two points of the Y, the same amount of flow will exit.  If any of you happen to have a Thermodynamics book, go ahead and look up Mass Flow rates, because the same principle is true here.  Here is a picture.

Chalkboard



And the forumla:



End Chalkboard

This concept is a bit difficult to grasp, so if you have any questions, please ask now.

[[5025]]

Also, I have no idea what kind of programming that is.  I know MATLAB, PSpice, Action Script 2 and 3, and Maple....

[MsRowdyRedhead]

Thanks, I'm still trying to figure out this program I just bought, it's very cool, the only problem I'm having is trying to get the diagrams here, btw, I remember Ohm's law as I=E over R where E is electro motive force, which is also known as voltage

Correct legodac. In the US we use V.

Ohm's Law defines the relationships between (P) power, (E) voltage, (I) current, and (R) resistance. One ohm is the resistance value through which one volt will maintain a current of one ampere.

( I ) Current is what flows on a wire or conductor like water flowing down a river. Current flows from negative to positive on the surface of a conductor. Current is measured in (A) amperes or amps.

( E ) Voltage is the difference in electrical potential between two points in a circuit. It's the push or pressure behind current flow through a circuit, and is measured in (V) volts.

( R ) Resistance determines how much current will flow through a component. Resistors are used to control voltage and current levels. A very high resistance allows a small amount of current to flow. A very low resistance allows a large amount of current to flow. Resistance is measured in  ohms.

( P ) Power is the amount of current times the voltage level at a given point measured in wattage or watts.

[[5025]]

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

[Maplen13]

Wait that Formula in the lecture..... I know that.... well the first part... it's something to do with.... I forgot... May I ask what is that?

[[5025]]

Wait that Formula in the lecture..... I know that.... well the first part... it's something to do with.... I forgot... May I ask what is that?

KCL or Ohm's law.

[[5025]]

Also, it's going to be a bit difficult if all 3 of us are using different methods to teach... I don't mind letting you guys teach it, and I can teach Thermodynamics instead...

[Maplen13]

In Kirchhoff's Voltage/Current Law with that E, I seen that before...

[[5025]]

In Kirchhoff's Voltage/Current Law with that E, I seen that before...

My professor chastised us for using E to represent Voltage.