Questions tagged [energy-use]

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21
votes
4answers
4k views

Do USB outlets waste energy just like conventional wall warts?

It is widely known that most AC-DC converters (aka "wall warts") continually use electricity, even when no devices are plugged in to them. That wasted energy is often called "phantom electricity" or "...
7
votes
2answers
14k views

How much power does an idle PC use?

My university's IT department has recently sent everybody an email asking us to leave our computers on at night, every night, so that they can do remote maintenance. They say "Despite what you may ...
4
votes
1answer
102 views

How can I figure out what's using so much electricity in my home?

I recently moved into a new home with 2 other housemates (joining 1 who already lived there) and our combined bill for electricity is far higher than I expected. Now we're using just over 40 kWh per ...
5
votes
2answers
120 views

Is an incrementalist approach to decarbonisation feasible?

There seem to be two broad approaches to the climate crisis. One centres around technological progress, where efficiencies, a gradual switch to renewables, and CCS enable a broadly similar model of ...
3
votes
1answer
72 views

Should a projector be turned off if it won't be used for five to ten minutes?

The conference rooms in my office have projectors mounted on the ceilings, typical of many offices. During the day, several meetings will be scheduled in the rooms, with perhaps five to ten minutes ...
15
votes
2answers
316 views

Should I replace existing inefficient light bulbs?

Similar to this question (except that's about cars), if I can buy more efficient light bulbs than the ones I'm using right now, should I? Or is it better to wait until my current light bulbs expire, ...
3
votes
1answer
51 views

How many grams of CO2 are emitted to produce one paper napkin?

Does using paper napkins have a high carbon impact?
2
votes
2answers
163 views

Is it better to leave your computer on?

This answer to a question on computer power use suggests that computers last longer when they are not frequently shut down. The answer is from 2014, and I do remember hearing this advice in the past. ...
2
votes
2answers
409 views

What is marginal energy?

I answered to a question and used the term "marginal energy". The answer wasn't understood by all, so I'm going to expand on the term to illustrate how it works. So, what is marginal energy?
2
votes
1answer
638 views

How much energy does it take to store 1 Terabyte of data in the cloud?

Some time ago I saw a documentary/infotainment program on television where they said that on average storing 1TB of data in the cloud costs 41 kWh of electricity per year. There was no further ...
5
votes
1answer
170 views

Are crypto currencies sustainable?

Except generating a different kind of "money value", what is the sustainable value of crypto currencies compared to the energy consumed to generate them? Compared to currencies working with ...
3
votes
2answers
2k views

How much electric energy would a studio apartment use per month if everything inside is powered by electricity (heater, water, stove, etc.)

How much electric energy, on average, would a typical one-person studio apartment consume per month in the winter if everything inside is powered by electricity? Additional Information: Apartment ...
4
votes
2answers
670 views

Is it worthwhile to collect leaves that fall in autumn from trees for biogas production?

I observe every year in autumn that fallen leaves are piled and left to rot. Assuming there are biogas facilities (say within 10 miles) is there some reason to not ferment the leaves? Is the energy ...
3
votes
2answers
140 views

Measure and compare energy consumption

does anyone know of a platform/forum where people measure and compare the energy consumption of their devices? I bought an energy metering plug, and now I can find out how much electricity my ...
5
votes
1answer
370 views

Electrical usage data logging with wireless data transfer

Does anyone know of a wireless energy usage capture device, that one can attach to an appliance and find out the energy usage? I know that there are certain energy monitors that do the job to some ...
7
votes
4answers
3k views

Which is more energy efficient? Heating ten 1L water separately or one 10L water directly

Just like the title said. In my house, we are very heavy tea drinkers. So my mother tends to boil a lot of water every day. She usually does this with a small amount of water (1-2L) every time she ...
2
votes
0answers
64 views

How effective are “GreenUp” (opt-in utility company green energy) programs? [duplicate]

My local Seattle utility offers a "Green Up!" program where customers can pay extra on each bill to buy energy from more renewable sources. I'm signed up to contribute at the highest level ($12/month),...
4
votes
2answers
841 views

How much energy costs do portable solar panels save in a house?

Our Houston area HOA does not allow roof top solar panels and I doubt they would survive our hurricanes too. I discovered NRG Energy sells these portable solar panels under their goal zero brand. If ...
11
votes
1answer
2k views

Do switchable sockets left “on” use electricity if there's nothing plugged in?

My flat is fitted with switchable sockets as per below: Please settle an argument a friend and I are having: if a socket is switched "on", is it wasting electricity if nothing is actually plugged ...
9
votes
6answers
420 views

How can I use my own body as an energy source for greater environmental sustainability?

I've had the epiphany that my body is a living vessel of energy production (and consumption), just like all other energy sources and associated forms of consumption or re-allocation around me. My ...