Electromagnet Task
- Unome
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Electromagnet Task
See rule 4.b.xii for details.
Creating a strong enough electromagnet to do anything useful with (pull a nail with a string attached off a ledge?) seems like it's a major part of the challenge.
Creating a strong enough electromagnet to do anything useful with (pull a nail with a string attached off a ledge?) seems like it's a major part of the challenge.
- cuber
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Re: Electromagnet Task
Here's a video on winding a coil using a machine built with lego : https://www.youtube.com/watch?v=tQY-XjC ... lebInvents
side note - I wonder if something like this: https://www.youtube.com/watch?v=J9b0J29 ... e%E5%90%9B would count as an electromagnet
side note - I wonder if something like this: https://www.youtube.com/watch?v=J9b0J29 ... e%E5%90%9B would count as an electromagnet
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Re: Electromagnet Task
Is it providing energy?Ashernoel wrote:Does a battery used in the construction of an electromagnetic count as a "battery source" ?
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Re: Electromagnet Task
Does a battery used in the construction of an electromagnetic count as a "battery source" ?
Yes, it would. As rule 3.j clearly explains all electrical circuits(as would be in this case) must be energized with a power source <= 14.4 volts.
It should be quite simple to run a wire from your current source to the electromagnet. It shouldn't take too much, in case you're concerned about the battery source bonus(rule 5.e).
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Hovercraft - Nationals - 5th Place
Roller Coaster - Nationals - 3rd Place
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Anatomy & Physiology
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RoboCross
Bottle Rocket
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Microbe Mission
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Division C - Ward Melville:
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Re: Electromagnet Task
I think that he meant a battery used once, pre-competition to magnetize an iron rod.. Under that assumption I believe it would not. #1: The ES would have no way of knowing if a part has been made magnetic via electricity before the competition. #2: IMO, a pre-magnetized ferrous core would not count as a circuit during the competition. #3: Under this logic, pretty much any form of modern data storage would be illegal, as the data presumably would not have been stored using the same battery used in competition, which would make a phonograph practically the only option for the final task.AbdullahNauman wrote:Does a battery used in the construction of an electromagnetic count as a "battery source" ?
Yes, it would. As rule 3.j clearly explains all electrical circuits(as would be in this case) must be energized with a power source <= 14.4 volts.
It should be quite simple to run a wire from your current source to the electromagnet. It shouldn't take too much, in case you're concerned about the battery source bonus(rule 5.e).
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Re: Electromagnet Task
It doesn't take much juice to throw a reed switch.Unome wrote:See rule 4.b.xii for details.
Creating a strong enough electromagnet to do anything useful with (pull a nail with a string attached off a ledge?) seems like it's a major part of the challenge.
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Re: Electromagnet Task
I already have my tiny reed switches, a nail, and copper wireFlavorflav wrote:It doesn't take much juice to throw a reed switch.Unome wrote:See rule 4.b.xii for details.
Creating a strong enough electromagnet to do anything useful with (pull a nail with a string attached off a ledge?) seems like it's a major part of the challenge.
Solon '19 Captain, CWRU '23
2017 (r/s/n): Hydro: 3/5/18 Robot Arm: na/1/1 Rocks: 1/1/1 2018 (r/s/n): Heli: 2/1/7 Herp: 1/4/4 Mission: 1/1/6 Rocks: 1/1/1 Eco: 6/3/9 2019 (r/s/n): Fossils: 1/1/1 GLM: 1/1/1 Herp: 1/1/5 Mission: 1/1/3 WS: 4/1/10 Top 3 Medals: 144 Golds: 80
Re: Electromagnet Task
When attempting to get the battery bonus, my electromagnet seems to suck away all the current as it is shorting the battery and the other circuits are barely recieving current. I have tried to add various resistors in an effort to prevent this, but then the electromagnet is too weak to throw the reed switch. Any ideas?
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Re: Electromagnet Task
Maybe put it last, to mitigate its effects, or use a microcontroller or a bunch of transistors to make the reed switch's output turn off the electromagnet. This should be legal as you can extrapolate from the FAQ that said it was OK to switch a motor off later down the line.dbli2000 wrote:When attempting to get the battery bonus, my electromagnet seems to suck away all the current as it is shorting the battery and the other circuits are barely recieving current. I have tried to add various resistors in an effort to prevent this, but then the electromagnet is too weak to throw the reed switch. Any ideas?
EDIT: Or you could put it inline with some sort of circuit breaker, so that after a bit it would turn itself off, and use a thyristor to keep whatever the reed switch was powering on.
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