Shock Value B

Re: Shock Value B

Postby blue cobra on Fri Feb 26, 2010 5:51 pm

I had an idea for the wiki, and since it's what I would consider a fairly large change, I thought I'd run it by some people first.

I was thinking I could replace the current 4 Series Circuits Formulas with a section titled Circuits Formulas. In the beginning there would be formulas applicable to circuits in general, such as Ohm's law and Kirchoff's laws. Then the current 4 Series Circuits Formulas would become a subset of that. Another subset would be Parallel Circuit Formulas, and could consist of this image and one or two examples, modeled after the current 4 Series Circuits Formulas. I also feel that this image is better to represent the series circuit formulas. The chart is much easier, for me at least, to understand than a word description. Also, I thought this section might be better after Episode VII, rather than where it is now.

So, what do you think? Should I go ahead with it? Any comments or suggestions?
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Re: Shock Value B

Postby robotman on Fri Feb 26, 2010 5:57 pm

blue cobra wrote:I had an idea for the wiki, and since it's what I would consider a fairly large change, I thought I'd run it by some people first.

I was thinking I could replace the current 4 Series Circuits Formulas with a section titled Circuits Formulas. In the beginning there would be formulas applicable to circuits in general, such as Ohm's law and Kirchoff's laws. Then the current 4 Series Circuits Formulas would become a subset of that. Another subset would be Parallel Circuit Formulas, and could consist of this image and one or two examples, modeled after the current 4 Series Circuits Formulas. I also feel that this image is better to represent the series circuit formulas. The chart is much easier, for me at least, to understand than a word description. Also, I thought this section might be better after Episode VII, rather than where it is now.

So, what do you think? Should I go ahead with it? Any comments or suggestions?

As long as nothing major gets deleted any wiki edit is always fine
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Re: Shock Value B

Postby Hamtown009 on Fri Feb 26, 2010 10:40 pm

Theoretical current anyone???? really confused
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Re: Shock Value B

Postby blue cobra on Sun Feb 28, 2010 3:17 pm

2. A 10 ohm resistor, a 15 ohm resistor, and a 5 ohm resistor are connected in parallel across a 90 V battery.
a. Draw a schematic diagram of the circuit.


Would we have to write the resistance next to the zig-zag resistor symbol?
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Re: Shock Value B

Postby robotman on Sun Feb 28, 2010 3:21 pm

blue cobra wrote:
2. A 10 ohm resistor, a 15 ohm resistor, and a 5 ohm resistor are connected in parallel across a 90 V battery.
a. Draw a schematic diagram of the circuit.


Would we have to write the resistance next to the zig-zag resistor symbol?


Since they did give you the resistance I would label the each resistor
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Re: Shock Value B

Postby blue cobra on Sun Feb 28, 2010 6:06 pm

Hamtown009 wrote:Theoretical current anyone???? really confused

I've never heard of that before. Where did you see it?
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Re: Shock Value B

Postby robotman on Sun Feb 28, 2010 7:49 pm

blue cobra wrote:
Hamtown009 wrote:Theoretical current anyone???? really confused

I've never heard of that before. Where did you see it?


Could you mean Theoretical current Flow?
if so it is simply that the electrons being negative will flow from the negative terminal of the power source to the positive due to the fact that they are attached to it(the positive terminal)
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Re: Shock Value B

Postby Hamtown009 on Sun Feb 28, 2010 10:34 pm

It was on a test... i'll tell you the exact problem tomorrow
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Re: Shock Value B

Postby Avis_de-Incendia on Wed Mar 03, 2010 4:59 pm

Does the topic of viscosity have anything to do with electricity?
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Re: Shock Value B

Postby smarticle13 on Sun Mar 07, 2010 9:25 pm

I don't think so
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Re: Shock Value B

Postby Hamtown009 on Fri Mar 12, 2010 10:46 am

The problem for theoretical current was:
List the resistnace of each resistor solve for the theoretical current and voltage drop for each resistor in the circuit. There was a circucit that was parallel. The resistances were the following: R1-55 R2-18 R3-10 R4-75 R5-100 R6-15 R7-22 . how would you then calculate the theoretical current and voltage drop???
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Re: Shock Value B

Postby andrewwski on Fri Mar 12, 2010 3:59 pm

I'm assuming every resistor was connected in parallel?

In that case I'm assuming they gave you the total voltage? In that case it's really easy. You know voltage in parallel always is the same, so just apply Ohm's Law to each individual resistor to find the current.

If you want to find total current, add the current of each resistor together (Kirchoff's Current Law) or find the total resistance (using the formula for resistance in parallel) and apply Ohm's Law.
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Re: Shock Value B

Postby blue cobra on Fri Mar 12, 2010 5:45 pm

If a component in a circuit was rated at 1 watt, would that mean that it uses 1 joule in 1 hour?
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Re: Shock Value B

Postby coach green on Fri Mar 12, 2010 5:56 pm

The values of the resistors that are given to you are nominal. All resistors have a tolerance. For example, the R5=100 ohms may have a 5% tolerance. That means the actual resistance measured may be as low as 95 ohms and as high as 105 ohms. The "theoretical" current and voltage drop across this resistor is calculated with the nominal value of 100 ohms. When you put a meter across the resistor the readings you take won't exactly match the "theoretical" current or voltage you calculated because of this tolerance. Furthermore, batteries put out more voltage than they are listed at. A fresh 1.5 volt battery puts out 1.6 volts, a 6 volt battery puts out 6.4 volts, a 9 volt battery puts out 9.6 volts, and a 12 volt battery puts out 12.8 volts. Again the "theoretical" calculation will use the nominal voltage of the battery and actual readings will not match.

1 watt = 1 joule/second
1 watt-hour= 1 joule/second * 3600 seconds/hour = 3600 joules
normally expressed in Kilowatt-hours
1 KW-hour = 1000 joules/sec * 3600 seconds = 3.6 x 10^6 joules
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Re: Shock Value B

Postby blue cobra on Fri Mar 12, 2010 7:14 pm

Thank you.

I was researching batteries, and I found plenty about wet cells, but is a dry cell basically just the same thing as a wet cell except that the electrolyte is in a paste? And since lemon juice is apparently an electrolyte (is there a specific reason why?) that's why when you stick two terminals of different metals (do the types of metals matter?) into a lemon you get voltage, correct?

And on my reference sheet, I have a resistor color code chart, formulas, and diagrams of a DC motor, a wet cell, and magnetism around a conducting wire. Is there anything I'm forgetting?
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