2 percent before the end of the world

[Christophe]

Yes there is (very) good in this documentary ... I did not say that everything was too light!

[Petrus]

So I have the subscription or not? I never had my access codes anyway!
But what is Youboox One ??? Ah an online book service?

I also discovered this thing, it is apparently an online book service via an application, I imagine that one cannot download epubs, so it is personally without interest.
All free subscribers have it, I also have the option on my bill, I did not ignore it because the total amount remains the same ... until January 1, 2020:

Given the success of the Youboox One offer, we decided to automatically provide you with this service integrating audio books, from February 1, 2020, for only 0,99 € per month (2), thanks to a discount of coupling.

[Petrus]

Well, this story of online book service reminds me of an evolution in consumption from purchasing to long-term rental.
Some naive people think that this can reduce over-consumption, except that the first selling point of these services is not to keep the objects as long as possible, but precisely the opposite: "to always be at the forefront of technology". So logically, that will only make it worse.

[Christophe]

For 1 € per month I think I'll keep: audio books are nice in the car on long / medium journeys ...

So we rotted this subject!

[izentrop]

For example with this incandescent electric bulb lit since 1901.

other version https://www.drgoulu.com/2011/10/16/la-v ... fK71OhKiCg

To sell it must be like the competitor but cheaper.
It is necessarily at the expense of quality and ultimately at the expense of sustainability.

Very reductive Efficiency do you know?

[eclectron]

Very reductive Efficiency do you know?

You said you didn't understand anything about Ahmed, the idea was to explain succinctly and not to write a thesis.

[Christophe]

For example with this incandescent electric bulb lit since 1901.

other version https://www.drgoulu.com/2011/10/16/la-v ... fK71OhKiCg

I already found the odd curve: https://www.wolframalpha.com/input/?i=1 ... 0+and+1500

Because for a usage price calculation: where does the root come from the power of 4 and the t / 1000 ??? Can someone explain?

Then when we read:

Or in other words, if your bulb lasts less than 1000h, you still gain a little!

In other words: must it not last long? Are you sure this is not a satirical article?

A cumulative use price curve is much simpler: it is purchase price / t + (hourly cost) * t, in this case for a 100W bulb, 0,1 kWh per hour ... i.e. 1 cents to 10 cents per kWh ...

We have the equation: 1 (€ of purchase) / t + 0,01 * t ...

Hence the interest in reducing the 0,01 because we see that after only 10 hours, the cost of use makes the overall cost take off again and after 100 hours we have spent more in use than in purchase (cost of the 10 kWh consumed> 1 €)

In image it gives this: https://www.wolframalpha.com/input/?i=1 ... +0+and+100

If we want the cost of use per hour t (not cumulative) then we have the equation 1 / t² + 0,01 ... we quickly see that it is an asymptote which tends towards 0,01 .. .logical since the investment cost becomes marginal after 10 a.m. in these hypotheses.

In pictures: https://www.wolframalpha.com/input/?i=1 ... +0+and+100

So who's good? Him or me?

We could repeat this reasoning with a vehicle at the price / km ...

ps: not bad this free online tracer!

[izentrop]

I actually shared the article for that

So how is it that the centenary light bulb from Livermore still works? It's very simple: this bulb uses a carbon filament whose resistance has increased over time. Designed for a power of 60W, it now only consumes 4W [4]. On all the photos of the bulb we can clearly see that its filament is red, “cold”. According to the equations of the “lamp rerating”, everything happens as if the bulb was now supplied with a voltage of 20.24 Volts instead of the 110 Volts for which it was designed (because (20.24 / 110) ^ 1.6 = 4 / 60). The brightness of the bulb is therefore now (20.24 / 110) ^ 3.4 = 0.3% of its original brightness for 4/60 = 7% of its original electric power. Its output has therefore dropped by a factor of 24: the Livermore fire station therefore pays 24 times more for its light than normal. And it is likely to last, because this drop in yield corresponds to a multiplication of the lifespan by (20.24 / 110) ^ - 12 = 700 million! If we admit that the Livermore bulb was designed to last 1000 hours, it will produce infrared for another 80 million years!

Or in other words, if your bulb lasts less than 1000h, you will still gain a little!
In other words: must it not last long? Are you sure this is not a satirical article?

I did not deepen but it must be in relation to the decrease in efficiency over time https://www.led-fr.net/lampe-a-incandescence.htm

If the bulb does not last long enough, the price increases when you cross the curve to the left because you have to buy more bulbs. On the other hand if the bulb lasts a long time, the price also increases to the right because it is necessary to consume more electricity for the same light, the filament being less hot.

In this case, a dimmer circuit would be required to increase the voltage and therefore the power consumed to obtain constant brightness. You're right it's capillotracté

[Christophe]

Sorry no better, it remains pseudo scientific gibberish ... like his equation out of the hat ...

Calculations at power 1.6 or 3.4 I have never seen that in physics !! Even if my lessons are far !!

If there are no other elements on the circuit, then the bulb is always supplied with 110V ...

I think we will stop wasting time on this kind of article

[dede2002]

It's just that it consumes less, and makes less light in proportion to the heat it gives off, basically it no longer works for the use for which it was intended ...

Now we no longer use incandescent bulbs, and the LEDs stop suddenly, or start blinking.