Science Nerds Assemble

Yeah but small amount of people doing it wouldn't necessarily raise prices. Yeah it will loose some inefficiency but I read that it's still worthwhile doing it. Just wondered why people aren't doing it as it can supposedly save quite a bit.
 
RomanNose said:
On the topic of energy..
Leccie prices are much cheaper at night, so why aren't more people buying batteries and charging them up overnight?
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Because batteries are not cheap and it would end up costing more to do that.

It can be done, hydro electric schemes work on a similar principle, but they store the energy by pumping water up to a high reservoir and releasing it during the day.
 
RomanNose said:
Yeah but small amount of people doing it wouldn't necessarily raise prices. Yeah it will loose some inefficiency but I read that it's still worthwhile doing it. Just wondered why people aren't doing it as it can supposedly save quite a bit.
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Do you want to do the calculations? How much is it for you during the day per kwh, how much at night and how much do you think you use in an average week? Even just a rundown of what you have on and for how long...
 
I don't know, I don't even think I have nighttime rates.
I was just interested as this photonic inductions does it, he might be a loon but I thought he might actually be saving a bit on it even with the inefficiencies.
 
RomanNose said:
Yeah but small amount of people doing it wouldn't necessarily raise prices. Yeah it will loose some inefficiency but I read that it's still worthwhile doing it. Just wondered why people aren't doing it as it can supposedly save quite a bit.
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Would be vaguely interesting to see some numbers but gut feeling says no way. So you invest several hundred in a big battery charger, a large bank of car batteries that you charge overnight, and an inverter so you can run stuff off them during the day. I'd wager that if the losses in the AC-DC, charging and DC-AC processes doesn't completely cancel out the savings of cheaper night rates there certainly wont be much gain left. So I reckon you'd pay back your investment in anything from never to a hell of a long time.
 
all of those "perpetual motion" videos that involve permanent magnets are not perpetual motion machines. the permanent magnets will eventually lose their magnetism as they are the source of energy

also, roman, i think i see where you're coming from. are you thinking of storing as much energy as you possibly can during the night when the tariff is cheap and then using that energy during the day in the hope that the inefficiency caused in the night electricity -> storage -> day usage chain is low enough to still be cheaper than the increased daytime tariff, despite it using up more electricity than straight power in the daytime
 
Celestial Nostos said:
You can only get out as much energy as you put into the system. Perpetual motion is not 'generating' energy, it's just conserving what it has.

Essentially, it would violate the laws of the conservation of energy.
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what about perpetual motion clocks? a 1c temp change can run them for days
 
But then you're changing the parameters by increasing/decreasing the temperature - ergo it's not a balanced equation, and therefore the conservation of energy is preserved.
 
groen said:
You should look at the videos "energy from the vacuum" 13 part series.

Basically using different techniques they show you can get more energy out of circuit than you put in. He says it gets the energy from the ether. Using tesla technique of using pulses to create spikes and using electro magnets and the pulses you can create over unity or negative resistance.

Over unity is when you get more energy from a circuit than you are putting in.
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laughable nonsense.

and to the OP - of course it won't work.
 
ChroniC said:
Even though its not touching anything, as it's free floating in zero mavity. Are you telling me that there is a loss of energy through the vacuum? I can understand that by friction, but its a frictionless environment.
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no, no it isnt. To spin a magnet in the way you suggest you need a shaft to keep it in place, and a mount to keep the shaft in place, you will lose energy to friction at these points.
 
people just don't understand the difference between a force and energy - magnetism and mavity are forces - they contain NO energy. they have NO energy to extract - anybody who claims to do otherwise is a moron.
 
ChroniC said:
Now, I never makes these types of threads because I know If I've thought of it, then someone smarter already has and it must be wrong, but I can't in this case for the life of me see why this doesn't work, and I want you guys to tell me why. (I've googled it, but can't find the info I need)

I'm always when bored, trying to think of ways to making a perpetual motion machine. (I know impossible) and have been recently trying to think of ways to make use of mavity as an energy source, but then this occurred to me.

If you took a simple basic electromagnetic generator, I.e a magnet in a coil, and spin it (you get a current as far as I remember).
I assume you don't get as much electrical energy out, as the energy put in to spin the actual magnet. However, if your in zero mavity, e.g space, would the magnet not spin indefinitely, giving you endless current, and endless electricity.

That's the basis of my stupid idea, now why doesn't it work, and then lets say we could tether to space, could we not just have 1000s of generators floating in orbit?

OCUK, shoot me down!!
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I am sorry I have not given all the responses a good look so this may have been mentioned but the reason this would not work is because of Lenz's Law.

Basically the magnet induces a current in the wire but the current induced produces its own magnetic field, equal and opposite to the field causing the current (Newtons third law), this will eventually stop the magnet spinning and prevents you from making lots of free energy.

This was a common physics experiment at GCSE back in 2000 when I studied it which shows the law in action:

http://www.youtube.com/watch?v=G7ysnXH53Wo

Note the pipe is made from copper, not very magnetic but a good electrical conductor. The edie currents formed as the magnets falls produce their own magnetic field and slow the magnet right down, this is with mavity driving the magnet too, so imagine how fast you space magnet would slow down.
 
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RomanNose said:
On the topic of energy..
Leccie prices are much cheaper at night, so why aren't more people buying batteries and charging them up overnight?
Click to expand...

The inefficiency in the batteries (not to mention the cost - large capacity batteries are VERY expensive) means it wouldn't be worth it at all.
 
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