C.1d ago

So I have a small pile of lithium-ion cells sitting beside me, freshly charged. From the count of cells, their rated capacity in amp-hours, and the nominal voltage of 3.7V, I calculate the stored energy as being close to 850,000 #joules.

One megajoule - only 17% larger - is described in Wikipedia as the amount of #kinetic #energy of a one-tonne mass moving at 161 km/h [1]. It's also traditionally described as approximating one 190g stick of #dynamite.

#Respect.

[1] Despite specifying the mass in metric tonnes, they give this velocity as "100 mph" primarily, thus displaying a Canadian-like schizoid approach to #unit systems.

[edit: fix position of footnote]

#LithiumIon #cell #battery #boom

Show threadMidgePhotoMay 26
@Korhaka @okwithmydecay
#Joules.
(GJ in practice).
David Cantrell 🏏Jan 8, 2025
Quite irritated at https://www.bbc.co.uk/news/articles/c5yd18q248jo and its use of #Watts. While Watts are a useful way of talking about batteries - you need to know how fast they can charge and discharge - it is at least as important to know how much they can store, and that's measured in #Joules. #Power and #Energy are not the same thing, #BBC! "The Devilla site will take the company's storage capacity up to 1.5GW" is nonsense.
Former Lanarkshire coal mine to be turned into giant battery park

Developers confirms ÂŁ800m investment across two sites in Scotland to support the growth in renewables

BBC News
KennethOct 22, 2024

How are the surge protectors of Belkin International, Inc. generally regarded in comparision with those of Monster, Inc.?

#Belkin
#Joules
#SurgeProtectors

Kara FinanceFeb 27, 2024

Word Search Puzzle 544

Word List : #canaut #endplate #jointly #ashman #filmcard #thriven #cork #dollies #talent #geebong #yallow #chives #secund #joules #leviable #tapestry #kreng #bailable

http://karafinance.com/2024/02/27/word-search-puzzle-544/

Word Search Puzzle 544

Word List : #canaut #endplate #jointly #ashman #filmcard #thriven #cork #dollies #talent #geebong #yallow #chives #secund #joules #leviable #tapestry #kreng #bailable

Kara Finance
Charles PlessyJan 11, 2024
Le #rendement d'un moteur thermique de #voiture est grossièrement comparable à celui d'une centrale électrique. Pour 100 #joules libérées par la combustion, environ les deux tiers sont perdues (https://planet-terre.ens-lyon.fr/ressource/rendement-energie.xml). J'habite sur une île dont l’#électricité est produite majoritairement dans des centrales thermiques, donc acheter une voiture électrique aujourd'hui ne réduirait pas la pollution que je génère en roulant (mais peut transformer la société en transformant la demande).
Étudier les bélemnites et leur phragmocône dans le centre commercial de la Part-Dieu (Lyon, Rhône) — Planet-Terre

Ressources scientifiques pour l'enseignement des sciences de la Terre.

Charles PlessyJun 30, 2023
According the Foods & Nutrition Encyclopedia via Wikipedia, “the #food #energy yield of #potatoes [is] about 95 giga #joules per hectare”. This makes 9.5 MJ/m2. If an #airplane could fly using potatoes the same way as we digest them, I would need between 2000 to 4000 square meters of potato field for my flights every year (20 to 40 GJ). Not accounting for the energy needed to produce the fertilizer and to harvest the potatoes! https://en.wikipedia.org/wiki/Potato#Yield
Potato - Wikipedia

Jonathan Kamens 86 47Jun 7, 2023

Trivial discovery of the day: “calorie” data in Garmin data exports is actually joules

Garmin data exports measure activity energy in joules but label it as calories. 1 calorie == 4.184 joules.

https://blog.kamens.us/2023/06/07/trivial-discovery-of-the-day-calorie-data-in-garmin-data-exports-is-actually-joules/

#Computers #ConsumerActivism #UserExperience #calories #DataScience #exercise #fitness #Garmin #joules

Trivial discovery of the day: “calorie” data in Garmin data exports is actually joules

Garmin data exports measure activity energy in joules but label it as calories. 1 calorie == 4.184 joules.

Something better to do
Charles PlessyMay 17, 2023
One of the benefits of using a #pipeline system of #bioinformatics #workflow like #Nextflow, is that it reports the total amount of compute #power that was used, which approximates the amount of #energy consumed. For instance, yesterday I aligned 16 pairs of trypanosome genomes; it took ~20 minutes but consumed ~20 hours of CPU cores. Assuming 10 Watts per core, this makes 200 Wh, which is 720 000 #Joules. One would need to multiply this by some factor to account for cooling the server room etc.
Charles PlessyMay 9, 2023

I guesstimate my annual #energy expenditure as follows, in giga #joules.

- Work (science & technology research): 100 ~ 350 GJ
- Airplane travel: 20 ~ 40 GJ
- Driving my car: 10 ~ 15 GJ
- Electricity at home: 5 GJ
- Food (my own metabolism): 3 GJ
- Burning gas: 2 GJ
- Telecommunications: 1 ~ 5 GJ
- Waste: not guesstimated yet.

In its vast majority, this energy is taken by burning fossil hydrocarbons.