Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [energy]

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

7
votes
2answers
509 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 ...
5
votes
1answer
390 views

Did the Falkland Islanders only have peat as fuel until the arrival of the Argentine oil companies?

I found this paragraph in the Spanish wikipedia entry about peat. A group of Falklanders shoveling peat around the 1950s. Peat was the only form of fuel used in the Falklands until the arrival of ...
15
votes
1answer
944 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. ...
1
vote
0answers
343 views

Are home owners required by law to connect gas in Victoria, Australia?

The One Step Off The Grid website claims that home owners in Victoria are required to connect to the gas network. It does not give an easy way to verify this claim. Did you know Victoria’s building ...
-4
votes
1answer
424 views

Is there compelling proof against an alternative to the law of conservation of energy? [closed]

The law of conservation of energy states that energy cannot be created or destroyed, but changed into different forms, which I've never found entirely compelling. It's impossible to measure the energy ...
6
votes
0answers
611 views

Does the Bitcoin network consume as much energy as Denmark?

According to Ars Technica: One estimate suggests the Bitcoin network consumes as much energy as Denmark. There are other sources that make similar claims: Greentech Media claim: The Bitcoin ...
59
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 ...
49
votes
3answers
12k 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 ...
3
votes
0answers
382 views

Does one kg of rock contain more energy in the form of U-238 than one kg of petroleum? [closed]

Let's consider rock and petroleum. Which contains more energy per kilogram? Due to Einstein, we know mass is energy, and the energy contents of both are equivalent. However, let's forget this and ...
17
votes
1answer
865 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 ...
43
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 ...
6
votes
1answer
1k views

Does Leonardo DiCaprio fly on private jets?

Does Leonardo DiCaprio fly on private jets? Example claim: Leonardo DiCaprio flies 8,000 miles in private jet to accept ‘green award' Oscar-winner Leonardo DiCaprio flew an additional 8,000 miles ...
1
vote
1answer
878 views

Has Brilliant Light Power developed a new source of energy from water molecules?

Brilliant Light Power is a company that claims, on their web-site, to have: developed a new commercially competitive, non-polluting, plasma-based primary source of massive power from the conversion ...
12
votes
2answers
763 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. ...
9
votes
2answers
3k 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 ...
26
votes
1answer
7k 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, ...
6
votes
1answer
686 views

Can one generate enough electricity from a plant to power a cellphone?

This company is marketing a product which uses the photosynthesis of a single houseplant to charge a phone. http://www.bioo.tech/ IIRC the theoretical maximum efficiency of photosynthesis is about ...
39
votes
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 ...
1
vote
0answers
199 views

Can a human generate a significant amount of electrical energy? [closed]

I found this video which claims to generate enough electrical energy to last 24 hours with one hour of cycling. However, one of the images shown was a meter which claimed 10 A, 10 V DC . Even assuming ...
19
votes
1answer
559 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 ...
3
votes
1answer
708 views

Does sealing electrical outlets reduce heating costs?

I stumbled upon this blog post which claims that installing foam gaskets and plugging your electrical outlets with plugs will reduce your heating costs by reducing air leakage. Is this true?
6
votes
0answers
244 views

Are Chinese companies dumping defective solar panels in other countries?

I've come across some people claiming that Chinese solar energy companies are dumping defective panels in other countries. The gist of the claim is that these low-cost panels will drive local ...
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
votes
2answers
2k 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 ...
0
votes
1answer
385 views

Is there any proof that blackle.com conserves energy? [duplicate]

There are claims that blackle.com conserves energy given that it is darker themed and produces less light. There is a counter under the search box that constantly increases. But in today's era of ...
2
votes
1answer
251 views

Does tapping on “acupoints” during an emotional problem change chemistry in the brain?

This claim is by David Feinstein, pH.D. in Acupoint stimulation in treating psychological disorders: Evidence of efficacy [.pdf] Essentially it is a claim that stimulating acupuncture points during ...
17
votes
1answer
967 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 ...
17
votes
1answer
776 views

Does the UK has 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 ...
11
votes
0answers
321 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 ...
14
votes
1answer
5k 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" ...
2
votes
0answers
109 views

Can a car run on water? As per this experiment [duplicate]

The Agha Waqar's car that ran on water was a great news for a long time. Where a Pakistan based inventor invented a car that got all the power from water. He was using a water kit to get the energy. ...
5
votes
1answer
2k views

Does the Theradome Laser Helmet deliver around 7 J/cm2 to the head?

The Theradome Laser Helmet is claimed by its manufacturers to promote healthy hair growth. In this infographic, they claim it delivers energy to the skull at a concentration of 6.959 j/cm2 - ...
6
votes
1answer
1k views

Do photovoltaic solar panels need replacement after 20 years?

Many manufacturers of photovoltaic solar panels offer some sort of warranty that is valid for 15 to 25 years. Many people suggest that after that period of time, a replacement of the panels is ...
21
votes
5answers
158k 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) ...
8
votes
1answer
378 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 ...
7
votes
2answers
2k 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 ...
3
votes
1answer
487 views

Is Gasification of Garbage a Viable Energy Solution?

I read this NYT article about using blast furnaces to turn garbage into burnable gas, yielding a net energy output. The article suggests that the company, Sierra Energy, is very close to building a ...
7
votes
2answers
563 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
1answer
426 views

Has a carbon price lead to a 8.6 percent drop in electricity demand in Australia?

In a press release China’s pilot carbon trading market taps UNSW expertise (press release is by the UNSW, which is my employer) Minister Combet highlighted the benefits to date of Australia’s ...
12
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 ...
5
votes
1answer
397 views

Is Australia the highest per capita emitter of greenhouse gases in the OECD?

The Australian earth hour web site claims that Australia is the highest greenhouse gas emitter per capita in the OECD. I've also heard this claim elsewhere. DID YOU KNOW… Australia is the highest ...
8
votes
2answers
7k 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,...
28
votes
1answer
11k 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 ...
37
votes
1answer
11k 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 ...
11
votes
2answers
21k 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 ...
22
votes
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....
5
votes
1answer
4k views

Are 2–4 hour washing machine programs eco friendly?

New washing machine (at least in the EU) often have a special program named with something like "green" or "eco" and that are supposed to be environmentally friendly. These are often for around 2–4 ...
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). ...
13
votes
1answer
714 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 ...
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 ...