All Questions
Tagged with renewable-energy electricity
21
questions
2
votes
2
answers
221
views
Energy lost to hydrogen fuel cell
So I have a question about an experiment we did in class.
We used a fan to blow air at a little wind turbine to generate electricity, we connected the turbine to a reversible PEM fuel cell to ...
- 37
0
votes
0
answers
68
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Tesla patented a device he believes gathered energy from light. (US 685,957 - Apparatus for the Utilization of Radiant Energy): [duplicate]
The invention is a sheet metal (top) place high above the ground. The sheet of metal is connected to a capacitor (the ⊔⊓ shapes) connected to the Earth. (The other stuff on the right of the image is a ...
- 1
0
votes
2
answers
595
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Changing number of wind turbine blades
I have read (and to some degree understood) that if one were to increase the number of blades for a wind turbine, it would be reasonable to reduce its rotational speed. In my mind I'd associate this ...
- 487
1
vote
0
answers
128
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Wind turbine design question [closed]
I am planning to design a wind turbine that is has rotor blade radius of 0.915m and is connected to a generator. The generators specifications are, it is an ac generator with 5000 coil turnings and a ...
- 189
0
votes
2
answers
255
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which is efficient on solar electricity by photo voltaic or thermal
As we know solar energy used to generate electricity in two major ways: photovoltaic and thermal energy. The most small applications or personal use are mostly using solar cells. But when it comes to ...
- 694
1
vote
1
answer
159
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Electricity from effervescence, is it possible?
I've had this idea for quite some time (after having a cold and seeing Tabcin sparkling tablets), is there the possibility to generate electricity from effervescence? I envisioned something like the ...
3
votes
1
answer
2k
views
Can capillary forces be used to make hydro electricity?
Could a device with very thin columns of glass or something that attracts water more be used to pull water up and then release it to drive generator and perhaps add vacuum.
I have been wondering ...
- 2,645
14
votes
6
answers
35k
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Are Fresnel lenses widely used for solar electricity? If not, why not?
I was just wondering why Fresnel Lenses are not widely used in the production of solar electricity. Their use there would mean that you could produce heat within a fraction of a second, up to a few ...
- 242
2
votes
0
answers
190
views
Is it possible to generate usable electricity from the motion or magnetic field of the Earth? [duplicate]
Let me start by saying that my knowledge of physics is almost nil (only high school level and I pretty much forgot everything) so bear with me, if I am asking naive questions the answers of which may ...
- 21
1
vote
6
answers
38k
views
Is it possible to generate electricity using a water tower?
Is it possible to build a water tower that will provide enough pressure to run an electricity generator? A water pump can be used to send water up to the tower. The water pump can be powered by solar ...
- 39
3
votes
2
answers
1k
views
What are the current possibilities for large-scale storage of electrical energy?
I'm curious as to how large-scale electrical storage is managed now, how much they can store, how well they scale and for how long (and what is their loss rate).
(I'm not asking about technological ...
- 13.1k
14
votes
5
answers
24k
views
Where does the electricity, generated by a solar panel, go if you don't use the electricity?
I'm sorry if this question is too trivial for this Q&A forum. I am a layman when it comes to physics (though I did cover the high-school physics courses).
I was wondering what happens to the ...
- 1,053
-1
votes
1
answer
189
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Do you think it’s possible to make a power plant of the described kind?
We are working on a science project and try to engineer a power plant of a new kind. It is called Air HES (air hydroelectric station). The idea is described on our website.
Do you think it is ...
- 163
2
votes
3
answers
352
views
Lightning Power?
What is the power source of a lightning? It doesn't consume fuel, nor an atomic fission/fusion, but it discharges a large amount of energy. Is it feasible to create an artificial lightning using the ...
2
votes
4
answers
8k
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Can energy be extracted from clouds?
Can cloud charge imbalance be used as an energy source?
First off quite some energy must be present in clouds: a lightning path is quite long, and electrical breakdown of air requires about 1MV/m. ...
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