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Everything posted by Acme
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How do you reduce voltage and make a current last longer?
Acme replied to MWresearch's topic in Engineering
There are different alternator/generator designs for different applications. Wiki has a good general article that describes them. >> Alternator @Wiki You cannot charge a battery with AC if that's what you are asking. Correct. If you expect such a drain you add more batteries [in parallel] to increase the amp hours. If you want to experiment then it's still a good idea to get the components I mentioned. Take them apart to see how they are constructed and seek out technical manuals specific to the parts you get. Do some web searches along the line of 'introduction to electronics'. PS Here is an excellent resource for all things battery. >> Battery University -
Step on a butterfly.
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How do you reduce voltage and make a current last longer?
Acme replied to MWresearch's topic in Engineering
Get a pocket multimeter at the hardware store for about 20$ and you can read exact voltages and amperages for your spreadsheet. They measure DC & AC usually from tenths of a volt up to 1000. Note: Ammeters must be connected in series or you'll blow them out. -
How do you reduce voltage and make a current last longer?
Acme replied to MWresearch's topic in Engineering
For a simple home-built system whether powered by wind, water or internal combustion engine you can use an automotive alternator, an automotive charge controller [called a regulator in cars] and a 12 volt deep-cell battery. You can get the alternator and regulator at a junk yard. I'd look for equipment made before digital electronics were introduced for the sake of simplicity. A typical automotive alternator is designed to operate between 2000 and 10000 rpm. Gear it appropriate to your power source to stay in this range It produces AC which is changed to DC using a diode array that's in the alternator case. Back in the day autos had DC generators but they didn't produce enough juice at low rpm so when you stopped at night the heater would slow, the lights would dim and the battery would drain. If you need AC house-current @120volts you get an inverter which attaches to the 12 volt battery. These come in varying wattages, e.g. mine is 800watts. Note these need to have a wattage that exceeds the regular operating wattage of some devices as there is a surge when starting those devices. Again for example, my 800 watt inverter will not run a 750watt hot-plate or heater. The battery capacity, measured in amp hours determines how long you can run specific stuff. My deep-cell battery is rated at 100amp/hours, though in practice you can only get about 80% of these batteries' capacity. Note alternators also have different ratings. These examples should make it clear why we need specifics on equipment rather than generalized descriptions. PS Use this formula to figure out the load in suitable units. Watts = Volts * Amps So if you have a 20 watt 12 volt light bulb you find the amperage 20watts / 12 volts = 1.6 amps. So that bulb would stay lit by my battery for 80 [amp/hours] / 1.6 amps = 50 hours. -
How do you reduce voltage and make a current last longer?
Acme replied to MWresearch's topic in Engineering
Because who knows how fast the generator will turn, who would want electricity in a circuit with a current that changes unpredictably by the second? OK, that's something. Now, does the generator produce AC or DC and at what voltage. What is powering the generator? The 'get rid of electricity' part is meaningless. If the charge controller shuts off the battery in the circuit then the generator circuit is open and there is no electricity. You take power from the battery to run whatever at a constant level and when the battery runs low below the set-point the charge controller closes the charging circuit and electricity flows again. Again, if there is no load on the generator it isn't making electricity. -
How do you reduce voltage and make a current last longer?
Acme replied to MWresearch's topic in Engineering
Let's see that model please. Give a link or cite a specific source. Given that there are different kinds of batteries, the details are required for any solution let alone a 'best' solution. So far your information is insufficient and poorly expressed. -
Found It! Countdown From August 2008, "100 Months"
Acme replied to Harold Squared's topic in Earth Science
There is nothing wrong with this. The many replies show that there is a great interest in this way of approaching issues. Poppycock. The many replies just indicate an interest in calling BS on trolling . Me thinks there is a severe lack of truthiness when Harold says he is now convinced and yet refers to 'your doctrine' and 'converting my buddies who are still in denial'. Nothing wrong with ignoring the data? Really? Phhhh. -
How do you reduce voltage and make a current last longer?
Acme replied to MWresearch's topic in Engineering
? What are you talking about with a water heater? Where did you get that? All-in-all you have laid out nothing but whacky misconceptions while ignoring several direct requests for the specifics of your setup. Good luck. -
How do you reduce voltage and make a current last longer?
Acme replied to MWresearch's topic in Engineering
If there is no electrical load then there is no flow of electricity; it's an open circuit. The energy used to drive the generator when there is no electrical load is lost as heat. -
On that note, I also see this with the paper: Wiki says of the group running the publication: I'm good with the neuroscience, but that Christian belief and evangelizing business is a red flag for me. I do hope that's not where all this is headed. Following a link chain from that article I located the full text of Schurger et al's study. Read it here: An accumulator model for spontaneous neural activity prior to self-initiated movement
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Addendum: I had a look at the paper you linked to Graeme, i.e. The Libet Experiment and its Implications for Conscious Will by Peter G.H. Clarke and in light of its date of publication and references I have to conclude Clarke is unaware of Hofstadter's work. Well, either that or he doesn't accept Dougie's analysis. :shrug: I also searched for 'criticism of strange loops' and 'sassing strange loops' and found only positive reviews; YRMV. But you couldn't possibly know about how a child abandoned behaves with no contact because if you did the child -and more to the point you- would have contact. Neither were you present to see/hear the first song, art, or any other first human behavior so your proclamations are nothing more than suppositions.
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Acknowledged. No, I do not know about others' views of Hofstadter, but I'll have a look around. As to reading Hofstadter, kudos for expressing the intention to do so. I would of course recommend bumping him to the front, as he does address why the neurobiology -while interesting- is insufficient to the task at hand. P.S. Here is a 2007 review of Hofstadter's strange loops from Scientific American; it touches on the insufficiency I just mentioned. A New Journey into Hofstadter's Mind:The eternal golden braid emerges as a strange loop
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See I Am A Strange Loop No need to respond here as no synopsis satisfies the need to read it. Anyway, I'm sure I have introduced Hofstadter's ideas on the concept of strange loops & consciousness a half dozen times or more here in different threads over the years and all to little or no acclaim. If your interested in the "I" then you may find Hofstadter well reasoned, contemporary, and informative.
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Why not just buy and/or copy the design of a commercial model? Lubbel Labs
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How do you reduce voltage and make a current last longer?
Acme replied to MWresearch's topic in Engineering
Charge controller Many varieties commercially available: Charge controller web search -
How do you reduce voltage and make a current last longer?
Acme replied to MWresearch's topic in Engineering
Use a battery. -
Well, it's straightforward algebra. Try working it through. Have you covered imaginary numbers in your course? If so, maybe review your book to decide if it's admissible.
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I'm a little rusty, but can you think of a way to rewrite -1 as a square?
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Report on 5 measurements and conclusion of experiment. ☼check Thursday August 6 10:45am 168hr/7d : salt down 4.8 cm / plain down 5.05cm Relative humidity 35%, temperature 66º, barometric pressure 29.81 inches of mercury ☼check Thursday August 6 7:45pm 177hr : salt down 5.4 cm / plain down 5.6 cm Relative humidity 48%, temperature 77º, barometric pressure 29.64 inches of mercury ☼check Friday August 7 10:45am 192hr/8d : salt down 5.4 cm / plain down 5.7 cm Relative humidity 56%, temperature 67º, barometric pressure 29.62 inches of mercury ☼check Friday August 7 12:33pm 193.75hr : salt down 5.7 cm / plain down 6.0 cm dry Relative humidity 51%, temperature 71º, barometric pressure 29.58 inches of mercury ☼check Friday August 7 2:45pm 196hr : salt down 5.9 cm dry/ plain down 6.0 cm dry Relative humidity 39%, temperature 82º, barometric pressure 29.54 inches of mercury Summary: Start Thursday July 30 10:45am 0 hours : both full 6.0 cm check Thursday July 30 3:45pm 5 hours : salt down .24cm / plain down .24cm check Friday July 31 8:00pm 33 hours : salt down 2.1 cm / plain down 2.1 cm check Saturday Augst 1 4:00pm 53 hours : salt down 3.0 cm / plain down 3.0 cm check Sunday Augst 2 10:45am 72 hr/3d : salt down 3.1 cm / plain down 3.2 cm check Monday Augst 3 10:45am 96 hr/4d : salt down 3.3 cm / plain down 3.5 cm check Monday Augst 3 4:00pm 101.25hr : salt down 3.6 cm / plain down 3.8 cm check Tuesday Augst 4 11:40am 121 hr/5d : salt down 3.7 cm / plain down 4.0 cm check Tuesday Augst 4 4:00pm 125 hr : salt down 4.0 cm / plain down 4.2 cm check Tuesday Augst 4 8:15pm 129.25 hr : salt down 4.2 cm / plain down 4.5 cm check Wednsday Augst 5 10:45am 144hr/6d : salt down 4.3 cm / plain down 4.6 cm check Wednsday Augst 5 7:15pm 152.5hr : salt down 4.7 cm / plain down 5.0 cm check Thursday Augst 6 10:45pm 168hr/7d : salt down 4.8 cm / plain down 5.05cm check Thursday Augst 6 7:45pm 177hr : salt down 5.4 cm / plain down 5.6 cm check Friday Augst 7 10:45am 192hr/8d : salt down 5.4 cm / plain down 5.7 cm check Friday Augst 7 12:33pm 193.75hr : salt down 5.7 cm / plain down 6.0 cm dry check Friday Augst 7 2:45pm 196hr : salt down 5.9 cm dry Conclusion While in sunlight the rate of evaporation is virtually equal for the salted and unsalted water, with the differing rates occurring principally overnight and/or when the precipitated salt rind is in contact with the water. Note: Any typos I blame on others but let me know and I'll make an effort to correct them & punish the offender(s).
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Ablation - Erosion of an object due to heating as it passes through an atmosphere.
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Earthlight - Light reflected onto the dark side of the Moon from Earth's atmosphere.
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What coefficients really are?
Acme replied to AllCombinations's topic in Linear Algebra and Group Theory
Raising goats is the preferred cowefficient and mutton you can say will change my mind. -
Shepherd moon - A small moon orbiting within a planetary ring system whose gravity maintains a distinct edge to rings. Cordelia and Ophelia are shepherd moons in Uranus' ring system.
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What coefficients really are?
Acme replied to AllCombinations's topic in Linear Algebra and Group Theory
Just some gentle ribbing of you in defense of coefficients in mathematics having some meaning in-and-of themselves. Similarly, coefficients have meaning in linear algebra as matrix operands. Nothing to get hung about. -
What coefficients really are?
Acme replied to AllCombinations's topic in Linear Algebra and Group Theory
Pascal's triangle binomial theorem cough cough.