Questions tagged [energy]

The ability a physical system has to do work on other physical systems.

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177
votes
4answers
26k views

Does a webpage with a black background save energy?

Blackle is a search engine that claims to save energy because it uses a black background. Is there any evidence to back up their claim that a website using a black background will save energy, and if ...
65
votes
0answers
8k views

Does one transaction on Bitcoin require 215 kWh? [closed]

This seems unbelievable: This averages out to a shocking 215 kilowatt-hours (KWh) [sic] of juice used by miners for each Bitcoin transaction (there are currently about 300,000 transactions per ...
48
votes
3answers
13k views

Can the US be powered by a 100 miles x 100 miles solar grid? [duplicate]

In this article Elon Musk is quoted to say that the US can be powered by a solar grid shaped as a square (in video he says "a corner of Utah or Nevada") 100 miles x 100 miles big. “If you wanted ...
46
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1answer
13k views

Did/does the US government keep secret papers by Nikola Tesla?

A popular conspiracy theory holds that Tesla invented a free energy device, but that the powers that be prevented him from publishing it, because it would hurt their investments. Of course, free ...
42
votes
3answers
8k views

Did wind power supply less than half a percent of global energy in 2014?

From The Spectator: Wind turbines are neither clean nor green and they provide zero global energy: Here’s a quiz; no conferring. To the nearest whole number, what percentage of the world’s energy ...
39
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3answers
2k views

Did the town of Woodland, North Carolina, USA reject a solar plant because of cancer and photosynthesis concerns?

The Raonoke Chowan News Herald reported on 8 December 2015 reports that the town of Woodland, North Carolina, USA rejected a solar farm, citing concerns on photosynthesis and cancer: Jane Mann said ...
38
votes
2answers
39k views

Can you recharge non-rechargeable alkaline batteries?

There are conflicting reports of whether it is possible to safely recharge alkaline batteries (not lithium) that are not sold as rechargable. The packaging for batteries regularly has cautions ...
33
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4answers
10k views

At the current rate are we going run out of fossil fuels by 2060?

British energy company Octopus Energy claims on their blog: If we keep burning fossil fuels at our current rate, it is generally estimated that all our fossil fuels will be depleted by 2060. This ...
33
votes
2answers
6k views

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 ...
31
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2answers
2k views

Which baby diaper is more Earth-friendly -- cloth or disposable?

We have a lot of friends who use cloth diapers, and I've heard some say that cloth diapers are actually more un-ecologically friendly than disposable diapers. I have a hard time buying that. I can ...
29
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5answers
4k views

Are there fewer accidental deaths at nuclear power plants than others?

I have seen the stats on this website saying that the number of death caused by nuclear accidents was way smaller then those caused by any other energy production factory. Do you have any information, ...
28
votes
1answer
12k views

Is there any data on how efficient Tesla wireless power transmission was?

It's widely believed that Nikola Tesla not only demonstrated wireless power transmission but his works in this field were very successful. Wikipedia only says this The electric energy transmitted ...
26
votes
1answer
12k views

Are there 14,000 abandoned wind turbines in the USA?

A number of blogs and sites seem to repeat a claim 14,000 ABANDONED WIND TURBINES LITTER THE UNITED STATES, and in particular: The towering symbols of a fading religion, over 14,000 wind turbines, ...
25
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7answers
7k views

Are there technologies that provide unlimited free energy?

Many different sources claim to be able to produce "unlimited free energy". For example: UNLIMITED FREE ENERGY IDENTIFIED Company claims to have developed new technology that provides unlimited free ...
23
votes
2answers
2k views

Does the amount of land needed to get the USA to zero-carbon electricity correspond to a small area of Texas?

After watching Elon Musk's presentation regarding the Tesla Powerwall, I had a question. On his diagram of the USA, he claims that a "tiny blue square" on the top of Texas that consists of solar ...
23
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2answers
2k views

Do wind turbines kill many birds each year?

It has been claimed that due to their large size, and the velocity of their blades that wind turbines kill large numbers of birds that run into them at night, or in fog, and die. http://www....
23
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2answers
4k views

Are 1 to 4 tons of coal required to create only one solar panel?

In the There's No Tomorrow video, they affirm several things about solar panels (and a lot of other things). The one I'm the most curious about is this: All the world's photovoltaic solar panels ...
22
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2answers
8k views

Is nuclear fusion energy as safe as its proponents claim?

With my limited knowledge of the process of nuclear fusion energy, this seems like one of the most promising methods for producing huge amounts of energy, with relatively very low risk, once ...
21
votes
3answers
3k views

Does the digestion of some foods burn more calories than it supplies?

Calories in food is a measurement of the amount of energy it will provide to the body. I've heard that eating some foods actually make you USE more calories than you consume. Do any foods actually ...
21
votes
5answers
162k views

Is this tealight-flowerpot heater more efficient than just tealights?

This article at the Daily Mail describes a small heater based on tealights and flowerpots. It claims that [the system] "make[s] the heating more efficient" (I assume in comparison to just tealights) ...
20
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1answer
1k views

Does nuclear power cause fewer deaths than other forms of electricity production, accidents included?

There have been several questions related to nuclear power in comparison to other forms of electricity production: Are there fewer accidental deaths at nuclear power plants than others? Do coal ...
20
votes
1answer
1k views

Does the UK have enough wind to power the country five times over?

Greenpeace UK tweeted about the UK having enough wind to power the country five times over: MT @1010: The UK has enough wind to power the country five times over. Let's use it! After a bit of ...
20
votes
1answer
9k views

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). ...
18
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2answers
1k views

Is the net output of CO₂ from Nuclear Energy lower than the net output of other energy sources?

While CO₂ is not produced directly when producing electricity from nuclear power, it is obvious that obtaining the radioactive material and preparing it for its use in a plant inevitably produces some ...
18
votes
1answer
621 views

Is widespread adoption of the electric car unlikely due to lithium scarcity?

Although lithium is very abundant in sea water, only lithium mineral extraction seems to be economically viable. The world's total reserves in lithium minerals is estimated at 13.5 Mt (not sure ...
17
votes
1answer
1k views

Are claims about saving power by turning appliances off instead of leaving them in standby accurate?

I keep hearing this argument that if you powered down all the appliances you normally leave on standby (TV, hifi, set top box, DVD/Blu ray player, computer, etc) you'll save nearly £90 a year in ...
16
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3answers
2k views

Are electric cars beneficial to the environment compared to low consumption modern cars?

Imagine an electric car in a country where most energy come from coal (which i believe is the dirtiest). Add this to the pollution that disposing the batteries will create, or the carbon footprint ...
16
votes
1answer
857 views

Does streaming a video to smartphone consume 1000W of electricity?

The German test magazine "Stiftung Warentest" tested video streaming platforms in the magazine 1/2020. As a side note they write on page 35: Laut Studien der grünen französischen Denkfabrik "The ...
16
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1answer
2k views

Can thorium end the energy crisis?

It seems that, as of lately thorium is steadily increasing in popularity, as an alternative to traditional nuclear fuels. Here's Mr. Kirk Sorensen in a TED video advocating the use of thorium. Thorium ...
15
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1answer
1k views

Does one SUV tank of ethanol "take as much grain as could feed a person for a whole year?"

From The Great Transition, (c)2014, by Lester R. Brown (preface, page xiii): [F]illing the tank of a large SUV one time with ethanol takes as much grain as could feed a person for a whole year. ...
15
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0answers
758 views

Solar energy in place of conventional energy sources [closed]

The first time I came across these arguments against solar energy was in "Overload" by Arthur Hailey. Admittedly, this is fiction, but the arguments seems to have some merit. Using solar cells to ...
14
votes
1answer
6k views

Is a car's fuel consumption increased when the headlights are on?

I have read in many sites that a car with lights on will consume more fuel that with lights off. The (hand-waving) justifications that I see tend to mention that "energy has to come from somewhere" ...
14
votes
1answer
759 views

Is each step in the food chain 10% efficient?

I remember learning in school many years ago that each level of the food chain is only about 10% efficient. So when an herbivore eats a plant, they get 10% of the energy that the plant had, and a ...
14
votes
2answers
494 views

Are CFLs always more ecologic than incandescent light bulbs?

Incandescent light bulbs are now being phased out in many countries. In practice, the replacements are mostly compact fluorescent lamps (CFL). In many cases, the energy savings created by CFLs justify ...
13
votes
2answers
3k views

Are wind turbines harmful to human health?

The so-called wind turbine syndrome has received quite a bit of attention of late. For example, on How Stuff Works: Until recently, there were three main issues regarding the possible downsides of ...
13
votes
1answer
504 views

Can drilling for geothermal energy trigger a major earthquake?

I remember reading about this geothermal project being cancelled due to concerns over (relatively) small seismic events caused by the drilling. Have there been any instances of, or reasonable ...
12
votes
2answers
22k views

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 ...
12
votes
1answer
640 views

Does streaming an album 27 times consume as much energy as manufacturing a CD?

According to an article on TheConversation: So which is the greener option? It depends on many things, including how many times you listen to your music. If you only listen to a track a couple of ...
11
votes
1answer
718 views

Does the Federal Energy Regulatory Commission require weatherized pipelines and equipment (but Texas's doesn't)?

The Houston Chornicle writes: Texas has the only American electricity grid with no rules for resiliency. Instead, the GOP majority argued that a system that pays higher prices when demand goes up ...
11
votes
2answers
799 views

Is flying the worst choice of travelling, considering the greenhouse effect and carbon-dioxide emission? [closed]

The communities I live in in Germany keep telling everybody that flying should be avoided by all circumstances, because it has a far bigger ecological footprint than any other mode of transportation. ...
10
votes
1answer
1k views

Do windmills in freezing climates require power so they don't seize up?

This graphic shared on Facebook, says windmills require active heating in freezing climates when not producing electricity. Its exact text reads, Germany's millions of solar panels are blanketed in ...
10
votes
0answers
334 views

Are powerful entities preventing the development of free or extremely low cost energy sources? [closed]

This is a common claim of people selling "free energy" devices that the government or oil companies are trying to suppress their work. I'm wondering if there's any documented examples of an oil ...
9
votes
2answers
3k views

How long does it take for renewable technology to recoup its energy cost?

There are a number of technologies which are aimed at producing energy from non-fossil sources, among which very popular are wind power and solar power technologies. However, I have encountered a ...
9
votes
0answers
395 views

Are electric cars better for the environment than internal-combustion cars? [duplicate]

Possible Duplicate: Does a car with a hybrid engine and Lithium batteries pollute more than a car with conventional technology? We hear a lot about electric cars being the future. But we also ...
8
votes
1answer
708 views

Is Russia's fiscal break-even price for oil around half of Saudi Arabia's?

According to the philosopher John Gray (Why this crisis is a turning point in history): An increasing influence on the EU will come from Russia. In the struggle with the Saudis that triggered the ...
8
votes
1answer
398 views

Do lithium ion batteries double effective performance every 18 month similar to Moore's law?

On Quora a person claims that lithium ion batteries improve roughly similar to Moore's law: The installed price of lithium ion batteries is dropping in half every 18 months and they last twice as ...
8
votes
2answers
5k views

Do Duracell batteries last longer than normal batteries?

The claim is Up to 10 times longer lasting power (*) vs. ordinary zinc carbon batteries in high powered toys and flash cameras (picture from Amazon) Do Duracell batteries last longer than Zinc ...
8
votes
2answers
9k views

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,...
7
votes
2answers
591 views

Do ad blockers in browsers save significant energy?

There is a claim that adverts sometimes include animations, which requires more energy to display, and that, hence, ad blockers save significant energy? Source: Blocking Online Ads May Save Energy ...
7
votes
2answers
599 views

Will smart meters cost each UK household 420 GBP?

The roll out of smart meters is well on its way in the UK. In this article it is claimed that smart meters will cost each household 420 pounds. Apparently, this money will be taken from each customers ...