The ability a physical system has to do work on other physical systems.
Questions tagged [energy]
88 questions
33
votes
1 answer
Is the "wind lens" a breakthrough in wind energy?
In this video a "brim" is placed around a wind turbine and the power generated doubles. A simple static mechanism that doubles the efficiency of a turbine seems too good to be true. Is this a legitimate breakthrough?
Additional links (but they all…
Larry OBrien
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Does keeping a fridge or freezer full improve its energy usage?
It's sometimes cited that a full fridge or freezer helps reduce its overall energy usage (for example, this source says so, based on the amount of cold air that 'can escape' when you open the door). However, I'm doubtful of this, based on the fact…
Andrew Ferrier
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12
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Can permanent magnets be exploited to create energy?
There are many videos on youtube in which permanent magnets are used to make a motor. Although it might be possible in an ideal environment (e.g. no friction). As these devices are rotating continously means that they are producing energy to…
smUsamaShah
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Does painting your radiators black make your heating more efficient?
I have heard that painting radiators in your central heating circuit black can make your heating more efficient. The 'scientific' basis being that black, whilst absorbing light in the visible spectrum, radiates infra-red (i.e. heat) better than the…
deed02392
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Neutrino “Solar Panels”: This can't be for real, is it?
I'm having my students research new energy technologies. One of them came across this website:
-Neutrino energy: harnessing the power of cosmic radiation
The website promotes a deeply unlikely energy technology: They say they can get a significant…
David Elm
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Do windmills take more energy to build than they could produce?
Saw this posted on a friend's feed on Facebook recently. Are the numbers correct, and is the final statement ("A windmill could spin until it falls apart and never generate as much energy as was invested in building it") correct?
NeutronStar
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