Ancestors

Toot

Written by Robbie 🇧🇪 :tux: on 2024-12-20 at 07:42

Electric car drivers often boast that their electric car can do around 4 miles (6.4km) per kWh.

My electric moped does slightly better ;) Over 32km per kWh in cold wet weather. Today my odometer will pass 6000 km. Using the same amount of energy my ICE car (+- 5l/100km) would have been able to drive about 395 km.

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Descendants

Written by Robbie 🇧🇪 :tux: on 2024-12-20 at 08:00

Also, that 6000km would have been more like 7500 km if I had driven a car. My commute is 22km by car but only 17.5km by moped because I'm allowed to ride the wrong way through a one-way street and I can take a bicycle path which is a shortcut through a wooded area which cars have to go around.

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Written by Robbie 🇧🇪 :tux: on 2024-12-20 at 08:37

And I just discovered something annoying: The screenshot above says "465Wh total power". Looks like the developers and the people that sign off on the app don't know the difference between power and energy 🤣

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Written by Jonathan Schofield on 2024-12-20 at 08:55

@deightonrobbie my ability to parse quanities of electrical energy and power is roughly where my understanding of the term entropy used to be. Which is to say, thoroughly confused.

I wish I had paid attention in Physics at school. But unfortunately the physics teacher made it as dull af and could not control the classroom

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Written by Robbie 🇧🇪 :tux: on 2024-12-20 at 09:00

@urlyman I taught myself the difference using a simple trick:

For power there's a unit everyone knows about. The number of horsepower a car makes. You need a big engine or motor if you need to produce a lot of power.

If you continue this way of thinking then energy is the amount of grass in the horse's stomach (or tank or battery)

If the horse runs (using a lot of power) then it needs to replenish the energy faster than if it walks

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Written by Jonathan Schofield on 2024-12-20 at 09:06

@deightonrobbie thanks. I get the difference between energy and power. It’s electrical units of measurement I struggle with

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Written by Robbie 🇧🇪 :tux: on 2024-12-20 at 09:20

@urlyman I understand. I had the same problem for a long time. If the unit has "h" (hour) in it then it can only be energy, because power doesn't have a time component. It is measured at a single moment. So Wh, kWh and mWh are always units of energy.

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Written by Robbie 🇧🇪 :tux: on 2024-12-20 at 09:21

@urlyman I find it more confusing that there are so many different units used, BTU, calorie, joules, kWh etc. The most confusing is calorie, because in some countries they use the term calorie when they actually mean kilocalorie, so there can be a factor 1000 difference by people using the exact same term!!!

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Written by Jonathan Schofield on 2024-12-20 at 09:22

@deightonrobbie yes indeed

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Written by Jonathan Schofield on 2024-12-20 at 09:22

@deightonrobbie thanks. That really helps

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Written by Solar 🌄Garden on 2024-12-20 at 10:12

@deightonrobbie @urlyman

kW.hours came about as a convenience energy-unit that is easy for people who have a feel for the power of eg a 1kW appliance to imagine. It's not a preferred unit of engineering or physics - the Joule is the standard base-unit. It's sort of working "backwards". kW.h is "energy per time" for "a given time". So time is most definitely part of power, as in Watts ="Joules per second" but having divided energy by time as seconds, kW.hr multiplies it out again - but by hours. All it's essentially done is added a factor of 3,600 to the ORIGINAL small unit, the Joule. [= seconds in 1 hour]. So 1 kiloWatt.hour = 3600 Joules, or 3.6 kJ.

Remember that the "." in the unit which for further confusion is often left-out means "X" in the maths sense, NOT "per" as in the divided by sense.

Hopefully this gives a little more scope to the discussion.

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Written by Robbie 🇧🇪 :tux: on 2024-12-20 at 10:23

@wavesculptor

Thanks Trev. I don't understand why people (or is it companies?) keep inventing new terms for the same thing. Lately power companies in the UK always talk about "a unit", pretending this is easier for people to understand than 1kWh, but in actual fact they are just making things even more confusing by using yet another general term for the same thing...

@urlyman

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Written by Solar 🌄Garden on 2024-12-20 at 10:42

@deightonrobbie @urlyman [...the UK always talk about "a unit", pretending this is easier for people to understan...] PR people who all had boring science teachers?

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Written by Jonathan Schofield on 2024-12-20 at 10:44

@wavesculptor

I do wish my chemistry and physics teachers had had the verve and humour of my maths teacher.

My biology teacher had a metre-long wooden ruler he liked to threaten us with

@deightonrobbie

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Written by Solar 🌄Garden on 2024-12-20 at 09:07

@deightonrobbie There's a lot of it about.

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