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goughy

Stupid, interesting, or uninteresting facts

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Post your stupid, interesting, or uninteresting facts here.  

It takes as much electricity to boil a full jug of water as it takes to run your fridge for a day!

So only full it as much as is needed.

Hit me with them?

 

 

 

 

I'm clearly in done sort of mood today!

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1 hour ago, goughy said:

Post your stupid, interesting, or uninteresting facts here.  

It takes as much electricity to boil a full jug of water as it takes to run your fridge for a day!

So only full it as much as is needed.

Hit me with them?

 

 

 

 

I'm clearly in done sort of mood today!

Yes, the energy requires to boil a kettle is proportional to the mass/volume of water in it - you can calculate it quite easily with the formula Q=MC(t1-t2) giving the joules required.  given M is mass in grams C is about 4.2 per cm3 for water, to heat up a liter from 20 degC to boiling would need around 336,00 joules.

Now given that the average kettle is about 1 kilowatt (or 1,000 joules per second)  and assuming there is no heat loss (there actually is quite a bit) and forgetting we are heating up the kettle as well heating, it will take around 5 to 6 minutes.

In actual fact the heat loss that occurs is actually proportional to the temperature which itself is increasing, meaning the process is covered by a single order linear differential equation, but I will leave that as an exercise for the reader.

The fridge is a little more complex but is essentially covered under the same formula, except you are working with negative temperature changes and the (lack of) efficiency of thermodynamics and heat transfer.

Is it just me, or is this stuff really interesting..!? :)

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1 minute ago, more said:

Macca's only forget your sweet and sour sauce when you don't bother to check before driving off..

100% fact that.  Bastards.  I won't get caught out on that again.

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4 hours ago, IronmanFoz said:

My Solar panels don't work at night.

Actually they do.  Admittedly, the return is almost useless but its there.  

My 120watt solar panel will return up to 7.5amp@13v in bright sunshine and somewhere between 0.05 and 0.1 amps in bright moonshine.

This fact was brought to you by Bundaberg Rum which is entirely to blame for the antics of that particular night

 

 

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15 hours ago, Pete said:

Is it just me, or is this stuff really interesting..!? :)

Is it cheaper to put your cup of water for a cuppa tea ( especially if you're by yourself ) into the microwave for 2 minutes?

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The Supermarine Spitfire was the pin-up aircraft of the Battle of Britain, when in fact the Hawker Hurricane did most of the heavy lifting re stopping German bombers over Britain, and could cope with more battle damage & still get its pilot home.

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Frederick Charles Standish who was Chief Commissioner of Police during the search for the Kelly Gang and came up with the idea of the Melbourne Cup horse race was once horse whipped at breakfast in the Melbourne club by another member who he had offended by using offensive language.

 

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4 hours ago, softy said:

Is it cheaper to put your cup of water for a cuppa tea ( especially if you're by yourself ) into the microwave for 2 minutes?

Assuming the same amount of water... I would think kettle. All of its energy is directed at the water, and it switches off when boiling, whereas the microwave blasts energy all over the place (including outside) runs a turntable, clock/timer/etc and has no idea when the water is boiling.

Edited by XCOM.!

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46 minutes ago, XCOM.! said:

Assuming the same amount of water... I would think kettle. All of its energy is directed at the water, and it switches off when boiling, whereas the microwave blasts energy all over the place (including outside) runs a turntable, clock/timer/etc and has no idea when the water is boiling.

Experiments have been done, and an induction cooktop is actually the most efficient. But you would need to have the lid on the saucepan to get the full efficiency. Second is an electric kettle, then the microwave.

But: if you have the cooktop on a lower setting, and it takes longer to boil, then you lose more heat & it becomes a less efficient option.

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It takes longer for a kettle to boil a little of water in America than it does in Australia. 

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They don't even use electric kettles there do they Rog, don't they mostly boil the kettle on the stove top due to the 110V ? 

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According to the science if you put a liter of petrol in your kettle it should boil a lot quicker than water as its boiling point is a lot lower (35 degC) and its thermal mass is a lot lower at around 1.6 (less than half that of water). Maybe one of you blokes can have a crack at this and let me know how it goes?

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3 hours ago, XCOM.! said:

Assuming the same amount of water... I would think kettle. All of its energy is directed at the water, and it switches off when boiling, whereas the microwave blasts energy all over the place (including outside) runs a turntable, clock/timer/etc and has no idea when the water is boiling.

With electric coils all the energy gets delivered to the source so the most efficient is the one the loses the less heat to the surroundings.  If an electric kettle had REALLY good insulation (eg if the coils were in a sealed thermos flask) it would win hands down but boiling water in sealed glass containers is considered a bit "Darwin awards" (see post above re boiling petrol :))

I don't know enough about microwaves' efficiency (50? see below) to comment but induction cooktops really are the bomb, ie they directly heat the thing you want heated (ie the pot) not the air around it.

From the good doctor G - 

A microwave is about 50 percent efficient. Most of the energy is lost in the process of converting electricity to microwaves (which are part of the electromagnetic spectrum). An electric stovetop is about 70 percent efficient, although that varies widely depending on the type of pot or kettle you use.

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40 minutes ago, Pete said:

... and allow more time to boil eggs on Mt Hotham

That's because the water boils at a lower temperature, so will take longer to cook the egg.

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29 minutes ago, Ex-Hasbeen said:

That's because the water boils at a lower temperature, so will take longer to cook the egg.

...and then we get into the subject of the triple point.

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Interesting fact (for those who don't know) the typical smoke detector is 'nuclear powered' - using a small amount of radioactive Americium-241 and a comparative circuit, to detect the difference in ionizing radiation received by an electrode in sealed and unsealed chambers - very clever tech we just take for granted.

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1 minute ago, XCOM.! said:

Interesting fact (for those who don't know) the typical smoke detector is 'nuclear powered' - using a small amount of radioactive Americium-241 and a comparative circuit, to detect the difference in ionizing radiation received by an electrode in sealed and unsealed chambers - very clever tech we just take for granted.

Yep-that's how this kid in the US managed tried to build an actual operating nuclear reactor!!

https://www.boredpanda.com/story-radioactive-boy-scout-david-hahn/?utm_source=google&utm_medium=organic&utm_campaign=organic

"Back in 1994, in a shed next to his mother’s house, the then 17-year-old David Hahn made a nuclear reactor "
"Hahn diligently amassed radioactive material by collecting small amounts from household products, such as americium from smoke detectors, thorium from camping lantern mantles, radium from clocks, and tritium from gunsights"

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Doesn't make the lights change quicker either!

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2 hours ago, XCOM.! said:

Smashing the button a million times at a pedestrian crossing doesn't make the traffic stop faster.

But tell me you can't help pushing it again even if it's already been pushed 😆

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5 hours ago, XCOM.! said:

Smashing the button a million times at a pedestrian crossing doesn't make the traffic stop faster.

But is does make you feel better. It is also fun to watch someone seethe that you are doing it.

 

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1 hour ago, A2K said:

Ever seen an owl without feathers? 

images-5.jpg

Yes.

Owl chicks are so grotesquely cute and hideously adorable before they're feathered.

Though that's the first unfeathered adult I've seen.

 

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9 hours ago, XCOM.! said:

Smashing the button a million times at a pedestrian crossing doesn't make the traffic stop faster.

The same with lifts... the call button only needs to be pushed once.

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1 hour ago, softy said:

The same with lifts... the call button only needs to be pushed once.

And unless the lift is from the 1980's and hasn't been updated (unlikely), the close door button actually serves no purpose, so why push it.

11 hours ago, XCOM.! said:

Smashing the button a million times at a pedestrian crossing doesn't make the traffic stop faster.

And for more useless information, hitting it once doesn't make any difference either most of the time. In most CBD's the walk sign will come on automatically when the corresponding red light comes on, which is controlled by traffic flow. If there is no traffic around it will help, but in normal business hours in the CBD they are superfluous.

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12 hours ago, more said:

But tell me you can't help pushing it again even if it's already been pushed 😆

Oh you are one of those people.  

 

Julie Bishop said the liberals have never lose an election on the same day that the Sydney swans play and win. 

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I went to the school parent-teacher talks last week. Every single one of my son's teachers commented on his "incredible knowledge of abstract and often unrelated facts. Here is one he came up with at breakfast today.

Gunpowder was originally invented as an "elixir of life" by taoists, and wasn't used as an explosive for another 2 centuries.

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