Shock Value B/Circuit Lab C

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Shock Value B/Circuit Lab C

Postby Jim_R » July 31st, 2013, 8:47 am

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Re: Shock Value B/Circuit Lab C

Postby GuyFromNowhere » September 28th, 2013, 3:17 pm

Hello, Shock Valuers! Super excited for this event this year.
Quick question about a Thevenin equivalent problem. At JS Gandora's circuit lab test at the test exchange, there is a Thevenin equivalent problem. Setting Node B as the ground, I used nodal analysis to get that Node A has voltage of 4 and node at the far right connected to the branches with 3 ohm, 1 ohm, and 2 ohm resistors (let's just call as node c) has 6 volts.
The answer says that the Thevenin voltage is 3/8 V. (The voltage diff between A and B) could someone set me straight here? On the bright side, I'm getting a correct Thevenin resistance.
Thanks.

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Re: Shock Value B/Circuit Lab C

Postby tangentline » September 29th, 2013, 6:25 pm

@Guyfromnowhere:
Your answer is presumably correct.
I did the problem with both the node voltage and superposition methods and came out to 4V.
The resistance of thevenin is indeed 15/8 ohms.
As far as confirmation, I used a "test" load resistor of 1 ohms and compared the respective current/voltage drop of the thevenin circuit and the actual circuit on that branch are the same with a thevenin voltage of 4V
The closest I can get to 3/8 is ignoring the current source and getting 5/8 V...
Last edited by tangentline on September 29th, 2013, 6:47 pm, edited 1 time in total.
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Re: Shock Value B/Circuit Lab C

Postby JSGandora » September 29th, 2013, 6:46 pm

I probably made an arithmetic mistake there, I made the answer key somewhat in haste. You are most likely correct.

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Re: Shock Value B/Circuit Lab C

Postby GuyFromNowhere » September 29th, 2013, 7:42 pm

Okay, thanks so much! Just wanted to make sure!

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Re: Shock Value B/Circuit Lab C

Postby Je suis K » October 23rd, 2013, 3:22 pm

what should I know for the "Practical" section?

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Re: Shock Value B/Circuit Lab C

Postby Jdogg » October 23rd, 2013, 3:59 pm

Je suis K wrote:what should I know for the "Practical" section?

You should be able to take your knowledge on the "test" portion and apply that to "lab" like questions. But you should also know how to operate a voltmeter, read resistor values, etc....
For example you might be given a RC circuit and asked to solve for the Capacitor's capacitance given a voltmeter, a switch, and a stopwatch while knowing the resistor and voltage of the battery (assumed to be ideal for small loads).
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Re: Shock Value B/Circuit Lab C

Postby transcience » October 28th, 2013, 6:55 pm

Can anyone make a list of website to study from?

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Re: Shock Value B/Circuit Lab C

Postby Je suis K » October 29th, 2013, 1:40 pm

How do we practice the "practical" section? Should I just try to light up a light bulb with a wire? I know last year at the wright state invitational they had a really difficult (at least to me and my partner) practical section. Any advice?

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Re: Shock Value B/Circuit Lab C

Postby Bozongle » October 30th, 2013, 5:56 am

Je suis K wrote:How do we practice the "practical" section? Should I just try to light up a light bulb with a wire? I know last year at the wright state invitational they had a really difficult (at least to me and my partner) practical section. Any advice?


Based off what I've seen, the practical section can be anything from the theoretical section except in real-life form. So, you still might have to solve problems, along with measuring, building, and following through certain directions. Although, read the rules to see what exactly you might see at competition. But be prepared for anything. Build series circuits, parallel circuits, combination of both, and other complex circuits. Use switches, resistors, variable resistors, etc. Measure everything you build, use Ohm's Law to find Voltage, Current, and Resistance. Build a circuit with a bulb and try to make the bulb the dimmest possible without it completely going out, and then try to make it as bright as possible. Repeat with a combination of bulbs, resistors, wire lengths, etc. Build an electromagnet, and even on one competition test you were supposed to build a simple motor based on materials given. Also, based on what you have, use different materials to build circuits. For example, get used to using a breadboard, and also alligator clips, and the "generic" copper wire. Just like any other practical lab event, practice helps the most.

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Re: Shock Value B/Circuit Lab C

Postby Shahkral » October 30th, 2013, 9:05 am

So, what should I use as study material? The main problem is I just don't know where to start.

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Re: Shock Value B/Circuit Lab C

Postby zyzzyva980 » October 30th, 2013, 9:07 am

I suggest starting at the Shock Value Wiki. We also have some practice Shock Value Test Exchange 2014 for you to look at. That should help you get started, but I'd also take a look at the Shock Value page and resources provided by soinc.org.
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Re: Shock Value B/Circuit Lab C

Postby UQOnyx » November 4th, 2013, 6:33 pm

Can someone (try to ;) ) explain the Wheatstone Bridge concept to me?
thanks
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Re: Shock Value B/Circuit Lab C

Postby chalker » November 5th, 2013, 10:23 am

UQOnyx wrote:Can someone (try to ;) ) explain the Wheatstone Bridge concept to me?
thanks


Why don't you try starting with the wikipedia article?
http://en.wikipedia.org/wiki/Wheatstone_bridge

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Re: Shock Value B/Circuit Lab C

Postby dchin1059 » November 7th, 2013, 3:01 pm

Can someone give me all the formulas we will need to know for Shock value (B)?
Thank you.


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