this post was submitted on 30 Mar 2025
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So, Alec over the Technology Connections channel made an hour long video explaining the difference with kW and kWh (obviously with other stuff around it).

I'm living in northern Europe in an old house, with pretty much only electric appliances for everything. We do have a wood stove and oven, but absolute majority of our energy consumption is electricity. Roughly 24 000 kWh per year.

And, while eveything he brings up makes absolute sense, it seems like a moot point. In here absolutely everyone knows this stuff and it's all just common knowledge. Today we went into sauna and just turned a knob to fire up the 6,5kW heaters inside the stove and doing that also triggered a contactor to disengage some of the floor heating so that the thing doesn't overload the circuit. And the old house we live in pulls 3-4kW from the grid during the winter just to keep inside nice and warm. And that's with heat pumps, we have a mini-split units both on the house and in the garage. And I also have 9kW pure electric construction heater around to provide excess heat in case the cheap minisiplit in garage freezes up and needs more heat to thaw the outside unit.

And kW and kWh are still commony used measurement if you don't use electricity. Diesel or propane heaters have labels on them on how many watts they can output right next to the fuel consumption per hour and so on. So I'm just wondering if this is really any new information for anyone.

I assume here's a lot of people from the US and other countries with gas grid (which we don't really have around here), is it really so that your Joe Average can't tell the difference between 1kWh of heat produced by gas compared to electricity? I get that pricing for different power sources may differ, but it's still watt-hours coming out of the grid. Optimizing their usage may obviously be worth the effort, but it's got nothing to do with power consumption.

So, please help me understand the situation a bit more in depth.

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[–] transientpunk@sh.itjust.works 99 points 3 months ago

I think you are greatly overestimating the basic functional knowledge of the general public...

[–] jol@discuss.tchncs.de 95 points 3 months ago (7 children)

If you think the average person understands watts, you live in a bubble, straight and simple. You have a very skewed notion of the average person.

[–] rice@lemmy.org 16 points 3 months ago (5 children)

Yep that video is leagues beyond most peoples capabilities to understand. Thinking they already knew and understood it is crazy.

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[–] bdonvr@thelemmy.club 41 points 3 months ago

In here absolutely everyone knows this stuff and it's all just common knowledge.

Absolutely not. Not even close.

[–] schizo@forum.uncomfortable.business 29 points 3 months ago* (last edited 3 months ago) (2 children)

lot of people from the US with gas grid (which we don’t really have around here), is it really so that your Joe Average can’t tell the difference between 1kWh of heat produced by gas compared to electricity

Right, because for most people gas is metered and sold by the CCF, and not converted into kW at any point in the chain.

So I know i used 30ccf last month, but there's zero indication what that is in kW, because we usually don't convert between the meter (which is volumetric) and the billing, which could be anything but why bother?

[–] qupada@fedia.io 12 points 3 months ago

Reticulated gas is charged by the kWh here in New Zealand. The meter may well be calibrated in m³ (I don't have gas at home, so I don't know for sure) but all pricing is energy, not volume.

For bonus points, if instead you buy your gas in cylinders - a pair of 45kg (~100lb) cylinders is a common installation for houses without piped gas - those are sold simply by the unit. The best conversion for that I can find is one energy retailer describing one 45kg cylinder as 2200MJ (611kWh).

I expect this is one of those things that is overall horribly inconsistent depending on where you live.

[–] Creat@discuss.tchncs.de 7 points 3 months ago (1 children)

Also from Europe, gas is measured/billed in kWh here as well.

[–] zymagoras777@lemm.ee 3 points 3 months ago

Not everywhere, in Lithuania they charge per m³.

[–] fuzzy_feeling@programming.dev 26 points 3 months ago

haven't seen it so far, but technology connections will always get an upvote.

also consider subscribing to his channel, his videos are amazing.

[–] krimson@lemmy.world 24 points 3 months ago
[–] sugar_in_your_tea@sh.itjust.works 23 points 3 months ago* (last edited 3 months ago)

is it really so that your Joe Average can’t tell the difference between 1kWh of heat produced by gas compared to electricity?

Yup.

I totally understand electricity because it's pretty intuitive. Everything is advertised in watts, my bill comes as kilowatt hours, so it's pretty easy to calculate how much energy something uses by plugging in a kill-a-watt and measuring it.

My gas is billed in therms. I don't really know what that is, nor do I know what the flow rate is for my furnace or gas stove, so I have no concept for how much energy I'm using. I don't have an electric one to compare with, so I that's not an option either. So how exactly would I get to the point where I would be able to compare the two without a lot of annoying testing? Even then it would be extremely imprecise.

And no, it's not "watt hours coming out of the grid," except in the pedantic sense that they can be converted. They come from very different sources, so it's like comparing an EV to a horse, and while you could, it's completely nonsensical.

But yes, at some base level your average American knows there's a connection between the two (after all, I can choose between electric heat/heat pump and a gas furnace), but they'd rely on an expert to estimate the monthly price difference between options, since that's ultimately what we care about. The problem is mentioned near the end of the video, HVAC experts don't seem that familiar w/ heat pumps, so you may not get a decent estimate, depending on who your technician is. And that adds to the misinformation.

[–] Tudsamfa@lemmy.world 20 points 3 months ago (1 children)

In here absolutely everyone knows this stuff and it’s all just common knowledge.

collapsed inline media

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[–] crystalmerchant@lemmy.world 18 points 3 months ago (1 children)

Power is water throughput in a pipe, energy is water filling a bucket. Simplest way I've found to explain it in my 15 years in the energy space.

[–] czardestructo@lemmy.world 2 points 3 months ago (1 children)

Power is a measurement of the velocity and volume of water flowing through a pipe at a given instant*

I'm so sorry, I am officially 'that guy', taking a simple analogy and making it annoying...

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[–] ftbd@feddit.org 17 points 3 months ago (3 children)

Follow-up video idea: speed ≠ distance

[–] purplemonkeymad@programming.dev 13 points 3 months ago (1 children)

The one that I think more people misunderstand is temperature Vs heat Vs something feeling hot/cold. One is a property, one is energy, and the other is the transfer of energy.

[–] Dasus@lemmy.world 3 points 3 months ago (4 children)

You know a nation of people who may not be able to articulate their understanding, but definitely have a high intuitive understanding of that?

We Finns.

100C sauna and no problem sitting on wood, but happen to touch something metal and oooh-weee.

Also same thing happens the others way around when it's - 20c outside. I don't think there's many people in Finland who don't have a core memory of what cold metal tastes like in winter, because of the resulting trauma. And it doesn't even need to be metal to stick.

Nicely explained.

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[–] miridius@lemmy.world 14 points 3 months ago (2 children)

Saved you a click: power = rate of energy use (energy/time)

[–] scarabic@lemmy.world 11 points 3 months ago

He says it so many times in so many ways that he actually starts to make it seem more complex than it is. You start wondering if you’re missing something, because you got it in 6 seconds but 12 minutes later he’s still talking about it.

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[–] Lumidaub@feddit.org 13 points 3 months ago

I sometimes make a conscious effort to understand electricity. For a few days, I then think I understand what's going on and then promptly I forget.

(Yes, I shall watch this video.)

[–] rice@lemmy.org 12 points 3 months ago (1 children)

There's no way even 1% of people understand this in the world. Maybe 1% know of those measurements "existence" asking them what they are would get an "uhh"

[–] dustyData@lemmy.world 4 points 3 months ago (4 children)

In the world? Me and millions of other people got this info in middle school physics. Sure, maybe we mostly forgot the details by now. But it's not arcane or ancient knowledge lost to time. It's in your electricity bill every month. A quick visit to Wikipedia and I got the gist of it back. Every single physicist, engineer, and electrician got this explained again to them.

[–] rice@lemmy.org 2 points 3 months ago

"a quick visit to wikipedia" is a good example confirming what I said, majority of people are not willing to do that to learn any subject. 0.483% of humans are engineers, of that I'd say there are a small chunk that are near worthless and probably don't even know these basics.

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[–] equinox86@lemm.ee 9 points 3 months ago

After watching the video it was a bit over explained. I think he got his point across in the first 10 minutes, though I am an engineer by trade.

I appreciate his rigour in explaining and it is a good refresher on the power/energy calculations.

[–] Emerald@lemmy.world 8 points 3 months ago

Also check out his other video on his Connextras channel where he basically suggests dismantling capitalism.

https://m.youtube.com/watch?v=Y2qSaD1v4cQ

[–] MangoPenguin@lemmy.blahaj.zone 7 points 3 months ago (1 children)

is it really so that your Joe Average can’t tell the difference between 1kWh of heat produced by gas compared to electricity?

Most people don't even know what a watt or watt/hour is. And have no idea how energy from gas relates to energy from electricity.

[–] boonhet@lemm.ee 2 points 3 months ago (9 children)

watt/hour

Oh yeah I've seen that used before, makes me cringe every time.

Anyway, do must people not go to high school? Or is stuff like that not part of the physics curriculum in some places?

[–] MangoPenguin@lemmy.blahaj.zone 4 points 3 months ago

Even if it was covered in high school, I think because most people never use it again in daily life it's easy to forget.

[–] kkj@lemmy.dbzer0.com 4 points 3 months ago (1 children)

A W/h either is a big problem or will be soon.

[–] boonhet@lemm.ee 2 points 3 months ago* (last edited 3 months ago)

I mean that depends on the sign of the W/h as well as your W/h^2^ and higher orders too. Maybe you're actually approaching zero watts :P

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[–] Septimaeus@infosec.pub 6 points 3 months ago* (last edited 2 months ago) (1 children)

He’s making a point about instantaneous versus overall energy use, which it sounds like you already understand. “Power” and “energy” are kind of loose terms IMO, which could confuse that conversation a bit.

But for anyone still scratching their head:

The typical energy consumer need only consider watts (w, kw) when accounting for circuit capacity. For example, if your hair dryer pulls 1600 watts, don’t use it on a 1500 watt outlet, or you will likely trip the circuit breaker.

Otherwise “watt-hours” (wh, kwh) is likely the metric you’re looking for when considering energy use. This is a certain amount of power drawn over a period of time, where 1 watt over 1000 hours and 1000 watts over 1 hour are both equal to 1 kilowatt-hour (kwh), which is the standard unit you likely see in your electric bill.

It’s why low but constant power draw can significantly impact energy use. For example, a typical laptop pulls fewer than 100 watts, lower than many appliances in your house, but if it draws that much power all the time, it might significantly impact your electric bill. Conversely, an electric kettle / coffee maker might pull as much as 1300 watts while in use, more than most appliances in your house, yet it probably represents a minuscule portion of your electric bill, since it only runs long enough to boil a small amount of water with each use.

Edit: include tea drinkers, add more concrete examples

[–] floquant@lemmy.dbzer0.com 2 points 3 months ago (1 children)

How are energy and power "loose terms"? Energy might be difficult to fully explain rigorously, but it's one of the fundamental elements of our universe. And power is just energy over time

[–] Septimaeus@infosec.pub 2 points 3 months ago

How are energy and power "loose terms"? Energy might be difficult to fully explain rigorously, but it's one of the fundamental elements of our universe. And power is just energy over time

Well, you yourself just provided the example, since your definition of energy and power are the inverse of the definitions used in the video.

It’s the fact that people use them differently or interchangeably that makes them “loose” IMHO.

[–] Prok@lemmy.world 3 points 3 months ago

Full disclosure, I didn't watch the video yet, but it's likely a difference of environmental impact.

He's described in previous videos how burning gas at home is less efficient from the standpoint of a carbon footprint. I imagine this video is to help explain everything in a way that helps you come to that conclusion yourself. Teach a man to fish instead of just giving a fish and what not. So you can apply the knowledge to other things in your life

[–] lka1988@lemmy.dbzer0.com 2 points 3 months ago

People complaining about this video have clearly not watched much Technology Connections; I enjoyed it immensely. It's right in line with how Alec normally does his videos. We who are loyal to the Great Alec expect the pedantic content.

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