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NASA's biggest worry right now: What if something goes wrong with the Webb telescope?
On Wed, 21 Feb 2018 09:00:12 -0700, Chris L Peterson
wrote: This is true for electrical appliances. It is worth noting that almost all electronic devices operate automatically from any mains power system used in the world. The next step is having the appliances automatically switch to 12V DC when given that. And we are on our way there. In Europe there are electrical railway engines which automatically switch between 16kV 16.667Hz and 1.5kV DC. That is needed when crossing nation borders on rail because then the electric system often switches too. This particular case happens when crossing between Sweden and Denmark. |
#112
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NASA's biggest worry right now: What if something goes wrong with the Webb telescope?
On Wed, 21 Feb 2018 11:20:51 -0700, Jibini Kula Tumbili Kujisalimisha
wrote: I vote for "Chris is delusional." The word "delusional" is inappropriate here, since it means something different than "having a different opinion than mine". |
#113
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NASA's biggest worry right now: What if something goes wrong with the Webb telescope?
On Wed, 21 Feb 2018 01:07:47 -0700, Chris L Peterson
wrote: On Wed, 21 Feb 2018 07:33:12 +0100, Paul Schlyter wrote: On Tue, 20 Feb 2018 13:21:02 -0700, Chris L Peterson wrote: Some cars will take power from the system, some will provide it. That's part of how charge balancing works in a system like that. Users pay for what they consume, and are compensated for what they provide. Interesting! So you then connect your car not just to charge it, but sometimes to discharge it? Exactly. Most models of a power grid with a substantial amount of wind and solar now include this in their design. A huge amount of fixed storage can be eliminated from the system once there's a large enough base of electric vehicles. (Of course, the design would only discharge within parameters the driver defines. If they needed a full charge, they might not offer to supply power. But most of the time, for most people, reducing your battery charge by a few percent would have no practical impact.) It must be more efficient to instead avoid charging your car more than you actually need. Of course this requires some planning, and car owners often hate to plan ahead... |
#114
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NASA's biggest worry right now: What if something goes wrong with the Webb telescope?
"Chris.B" wrote in
: On Wednesday, 21 February 2018 20:40:33 UTC+1, Jibini Kula Tumbili Kujisalimisha wrote: It would take me two hours each way to take a bus to work. I live about 8 miles from the office. A pleasant cycle ride with all the known health and economic benefits in some countries. So now you condemn disable people to homeless and death by slow starvation, and healthy people risk being run over by the millions of maniacs on the road. (Southern California is *not* friendly to pedestrians or cyclists.) How very . . . liberal of you. In the event of hills, an electrically assisted cycle might be an option. At least until you become reasonably fit. Your mileage may vary. My milease is nealry 40 mpg on the highway. More like 30 on city streets. And I've got better things to do with my time. -- Terry Austin Vacation photos from Iceland: https://plus.google.com/u/0/collection/QaXQkB "Terry Austin: like the polio vaccine, only with more asshole." -- David Bilek Jesus forgives sinners, not criminals. |
#115
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NASA's biggest worry right now: What if something goes wrong with the Webb telescope?
Paul Schlyter wrote in
: On Wed, 21 Feb 2018 11:20:51 -0700, Jibini Kula Tumbili Kujisalimisha wrote: I vote for "Chris is delusional." The word "delusional" is inappropriate here, since it means something different than "having a different opinion than mine". I means exactly what I think it means: "believing something is real when it's not." Another word is "hallucinating." You're not really any better, though you're not quite as stupid. Almost, but not quite. -- Terry Austin Vacation photos from Iceland: https://plus.google.com/u/0/collection/QaXQkB "Terry Austin: like the polio vaccine, only with more asshole." -- David Bilek Jesus forgives sinners, not criminals. |
#116
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NASA's biggest worry right now: What if something goes wrong with the Webb telescope?
Paul Schlyter wrote in
: On Wed, 21 Feb 2018 01:07:47 -0700, Chris L Peterson wrote: On Wed, 21 Feb 2018 07:33:12 +0100, Paul Schlyter wrote: On Tue, 20 Feb 2018 13:21:02 -0700, Chris L Peterson wrote: Some cars will take power from the system, some will provide it. That's part of how charge balancing works in a system like that. Users pay for what they consume, and are compensated for what they provide. Interesting! So you then connect your car not just to charge it, but sometimes to discharge it? Exactly. Most models of a power grid with a substantial amount of wind and solar now include this in their design. A huge amount of fixed storage can be eliminated from the system once there's a large enough base of electric vehicles. (Of course, the design would only discharge within parameters the driver defines. If they needed a full charge, they might not offer to supply power. But most of the time, for most people, reducing your battery charge by a few percent would have no practical impact.) It must be more efficient to instead avoid charging your car more than you actually need. Of course this requires some planning, and car owners often hate to plan ahead... That is largely handled by automated system. Currently, they go to a trickle charge state when full charge is achieved, but that's a setting, not an inherent feature. Only planning required is for the programmers to change the setting. -- Terry Austin Vacation photos from Iceland: https://plus.google.com/u/0/collection/QaXQkB "Terry Austin: like the polio vaccine, only with more asshole." -- David Bilek Jesus forgives sinners, not criminals. |
#117
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NASA's biggest worry right now: What if something goes wrong with the Webb telescope?
On Thu, 22 Feb 2018 10:19:43 +0100, Paul Schlyter
wrote: It must be more efficient to instead avoid charging your car more than you actually need. Of course this requires some planning, and car owners often hate to plan ahead... I'm not sure. Often there is excess power available, which with a solar/wind source system is essentially free. So when you have an excess, you charge everything that is asking to be charged, and that gives you reserve to draw on when demand exceeds supply at other times. |
#118
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NASA's biggest worry right now: What if something goes wrong with the Webb telescope?
On Thu, 22 Feb 2018 09:43:03 +0100, Paul Schlyter
wrote: On Wed, 21 Feb 2018 01:10:26 -0700, Chris L Peterson wrote: On Wed, 21 Feb 2018 07:21:07 +0100, Paul Schlyter wrote: Interesting - so you have two-phase AC with a 180 deg difference between the phases! We don't have that, instead we have three-phase AC with 120 deg difference between the phases. Connecting between two phases will increase the voltage not hy a factor of sqrt(4) but by a factor of sqrt(3) to 400v from the single phase voltage of 230V. Split-phase is actually a single phase system. We also have three-phase systems, but they're usually only found in commercial installations. But I do know people who have had them installed residentially to power their personal shops. Which means you have 240V single phase center grounded. To get, 120V you connect between ground and one of the live wires. Are the power ground and protective ground separate wires or are they the same wire? They are separate wires from the service panel to the individual outlets. |
#119
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NASA's biggest worry right now: What if something goes wrong with the Webb telescope?
On Thu, 22 Feb 2018 09:44:49 +0100, Paul Schlyter
wrote: The power is distributed as two wires and a neutral (ground). You can't distribute three phases like that. Right. It isn't three-phase. Many high voltage distribution lines carry three-phase, which is why it's usually available. But for residential distribution, a transformer at the pole or distribution box converts this to a split-phase supply. |
#120
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NASA's biggest worry right now: What if something goes wrongwith the Webb telescope?
On Thursday, 22 February 2018 18:06:29 UTC+1, the latest s.a.a. boor wrote:
My milease is nealry 40 mpg on the highway. More like 30 on city streets. And I've got better things to do with my time. Not enough time to type accurately it seems. Or even make much sense. I did stipulate that successful cycling is country specific. In some countries city cycling is much faster than average vehicle traffic speeds and has been for decades. But do have nice commute. No doubt the time you [think you] save in the car will be amply repaid in hospital time somewhere down the road. Do try to remember: You cannot insult anybody who does not respect you. You merely insult your own intelligence. Always assuming there was any to insult in the first place. ;-) |
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